Merge pull request #107 from Permissionless-Software-Foundation/ct-unstable

fix(package-lock.json): Updating package-lock.json

package.json

@@ -13,11 +13,11 @@
     "test:integration:abc": "export RESTURL=https://abc.fullstack.cash/v4/ && export IS_USING_FREE_TIER=true && mocha --timeout 30000 test/integration/ && mocha --timeout 30000 test/integration/chains/abc/",
     "test:integration:bchn": "export RESTURL=https://bchn.fullstack.cash/v4/ && export IS_USING_FREE_TIER=true && mocha --timeout 30000 test/integration/ && mocha --timeout 30000 test/integration/chains/bchn/",
     "test:integration:testnet": "IS_USING_FREE_TIER=true mocha --timeout 30000 test/integration/chains/testnet/",
-    "test:integration:local": "RESTURL=http://localhost:3000/v4/ mocha --timeout 30000 test/integration",
-    "test:integration:local:bchn": "RESTURL=http://localhost:3000/v4/ mocha --timeout 30000 test/integration/ && mocha --timeout 30000 test/integration/chains/bchn/",
-    "test:integration:local:testnet": "RESTURL=http://localhost:4000/v4/ mocha --timeout 30000 test/integration/testnet",
-    "test:temp": "export RESTURL=https://bchn.fullstack.cash/v4/ && mocha --timeout 30000 -g '#tokenUtxoDetailsWL' test/integration/",
-    "test:temp2": "mocha --timeout=30000 -g '#tokenUtxoDetailsWL' test/unit/",
+    "test:integration:local:abc": "export RESTURL=http://localhost:3000/v4/ && mocha --timeout 30000 test/integration && mocha --timeout 30000 test/integration/chains/abc/",
+    "test:integration:local:bchn": "export RESTURL=http://localhost:3000/v4/ && mocha --timeout 30000 test/integration/ && mocha --timeout 30000 test/integration/chains/bchn/",
+    "test:integration:local:testnet": "RESTURL=http://localhost:4000/v4/ mocha --timeout 30000 test/integration/chains/testnet",
+    "test:temp": "export RESTURL=https://bchn.fullstack.cash/v4/ && mocha --timeout 30000 -g '#UTXO' test/integration/chains/bchn/",
+    "test:temp2": "mocha --timeout=30000 -g '#Util' test/unit/",
     "coverage": "nyc report --reporter=text-lcov | coveralls",
     "coverage:report": "nyc --reporter=html mocha --timeout 25000 test/unit/",
     "docs": "./node_modules/.bin/apidoc -i src/ -o docs",
@@ -30,6 +30,11 @@
     "url": "git+https://github.com/Permissionless-Software-Foundation/bch-js.git"
   },
   "dependencies": {
+    "@psf/bip21": "^2.0.1",
+    "@psf/bip32-utils": "^0.13.1",
+    "@psf/bitcoincash-ops": "^2.0.0",
+    "@psf/bitcoincashjs-lib": "^4.0.2",
+    "@psf/coininfo": "^4.0.0",
     "@uppy/core": "^1.10.4",
     "@uppy/tus": "^1.5.12",
     "assert": "^2.0.0",
@@ -39,20 +44,15 @@
     "bigi": "^1.4.2",
     "bignumber.js": "^9.0.0",
     "bip-schnorr": "^0.3.0",
-    "@psf/bip21": "^2.0.1",
-    "@psf/bip32-utils": "^0.13.1",
     "bip38": "^2.0.2",
     "bip39": "^3.0.2",
     "bip66": "^1.1.5",
-    "@psf/bitcoincash-ops": "^2.0.0",
-    "@psf/bitcoincashjs-lib": "^4.0.2",
     "bitcoinjs-message": "^2.0.0",
     "bs58": "^4.0.1",
     "buffer": "^5.1.0",
     "cashaddrjs": "^0.3.3",
     "chalk": "^2.3.0",
     "clear": "0.1.0",
-    "@psf/coininfo": "^4.0.0",
     "commander": "^3.0.0",
     "cp-file": "^7.0.0",
     "ecurve": "^1.0.6",

src/bch-js.js

@@ -31,6 +31,7 @@ const Schnorr = require('./schnorr')
 const SLP = require('./slp/slp')
 const IPFS = require('./ipfs')
 const Encryption = require('./encryption')
+const Utxo = require('./utxo')
 
 // Indexers
 const Ninsight = require('./ninsight')
@@ -113,6 +114,7 @@ class BCHJS {
     this.SLP.HDNode = this.HDNode
 
     this.IPFS = new IPFS()
+    this.Utxo = new Utxo(libConfig)
   }
 }
 

src/slp/tokentype1.js

@@ -118,11 +118,11 @@ class TokenType1 {
 
         // Convert the send quantity to the format expected by slp-mdm.
         const baseQty = sendQtyBig.toString()
-        console.log('baseQty: ', baseQty)
+        // console.log('baseQty: ', baseQty)
 
         // Convert the change quantity to the format expected by slp-mdm.
         const baseChange = change.toString()
-        console.log('baseChange: ', baseChange)
+        // console.log('baseChange: ', baseChange)
 
         // Check for potential burns
         const outputQty = new BigNumber(baseChange).plus(

src/slp/utils.js

@@ -602,7 +602,8 @@ class Utils {
    * @api SLP.Utils.validateTxid3() validateTxid3()
    * @apiName validateTxid3
    * @apiGroup SLP Utils
-   * @apiDescription Validate that txid is an SLP transaction using the SLPDB whitelist server.
+   * @apiDescription
+   * Validate that txid is an SLP transaction using the SLPDB whitelist server.
    * Same exact functionality as the validateTxid() function, but this function
    * calls the whitelist SLPDB. It will only validate SLP tokens that are in the
    * whitelist. You can retrieve the whitelist with the SLP.Utils.whitelist()
@@ -652,6 +653,7 @@ class Utils {
     const path = `${this.restURL}slp/validateTxid3`
 
     // console.log(`txid: ${JSON.stringify(txid, null, 2)}`)
+    // console.log(`path: ${JSON.stringify(path, null, 2)}`)
 
     // Handle a single TXID or an array of TXIDs.
     let txids
@@ -1109,7 +1111,7 @@ class Utils {
 
           // Validate using a 'waterfall' of validators.
           utxo.isValid = await this.waterfallValidateTxid(utxo.txid)
-          // console.log(`isValid: ${JSON.stringify(isValid, null, 2)}`)
+          // console.log(`isValid: ${JSON.stringify(utxo.isValid, null, 2)}`)
         }
       }
 
@@ -1448,6 +1450,8 @@ class Utils {
 
   async waterfallValidateTxid (txid) {
     try {
+      // console.log('txid: ', txid)
+
       const cachedTxValidation = {}
 
       // If the value has been cached, use the cached version first.
@@ -1728,6 +1732,42 @@ class Utils {
     }
   }
 
+  /**
+   * @api SLP.Utils.hydrateUtxosWL() hydrateUtxosWL()
+   * @apiName hydrateUtxosWL
+   * @apiGroup SLP Utils
+   * @apiDescription
+   * This call is exactly the same as `hydrateUtxos()`. This version hydrate a
+   * UTXO with SLP token metadata, but only uses the whitelist SLPDB for
+   * validation.
+   *
+   * Whitelist SLPDBs will return `isValid: null` for any token not in the
+   * 'whitelist' filter. Filtered SLPDBs are much smaller and more reliable
+   * to operate.
+   *
+   */
+  // Same as tokenUtxoDetailsWL(), but reduces API calls by having bch-api server
+  // do the heavy lifting.
+  async hydrateUtxosWL (utxos) {
+    try {
+      // Throw error if input is not an array.
+      if (!Array.isArray(utxos)) throw new Error('Input must be an array.')
+
+      const response = await _this.axios.post(
+        `${this.restURL}slp/hydrateUtxosWL`,
+        {
+          utxos: utxos
+        },
+        _this.axiosOptions
+      )
+
+      return response.data
+    } catch (error) {
+      if (error.response && error.response.data) throw error.response.data
+      else throw error
+    }
+  }
+
   /**
    * @api SLP.Utils.getStatus() getStatus()
    * @apiName getStatus

src/util.js

@@ -27,6 +27,129 @@ class Util {
     _this = this
   }
 
+  /**
+   * @api util.floor8() floor8()
+   * @apiName floor8
+   * @apiGroup Util
+   * @apiDescription Round a number down to 8 decimal places.
+   *
+   *
+   * @apiExample Example usage:
+   * (async () => {
+   *   try {
+   *     const num = 1.234567891111
+   *     const result = bchjs.Util.floor8(num)
+   *     console.log(result)
+   *   } catch(error) {
+   *    console.error(error)
+   *   }
+   * })()
+   *
+   * // returns
+   *  1.23456789
+   */
+  // floor8 - round to 8 decimal places
+  // Takes a number and returns it, rounded to the nearest 8 decimal place.
+  floor8 (num) {
+    const thisNum = Number(num)
+
+    if (isNaN(thisNum)) throw new Error('input must be a number')
+
+    let tempNum = thisNum * 100000000
+    tempNum = Math.floor(tempNum)
+    tempNum = tempNum / 100000000
+
+    return tempNum
+  }
+
+  /**
+   * @api util.floor2() floor2()
+   * @apiName floor2
+   * @apiGroup Util
+   * @apiDescription Round a number down to 2 decimal places.
+   *
+   *
+   * @apiExample Example usage:
+   * (async () => {
+   *   try {
+   *     const num = 1.234567891111
+   *     const result = bchjs.Util.floor2(num)
+   *     console.log(result)
+   *   } catch(error) {
+   *    console.error(error)
+   *   }
+   * })()
+   *
+   * // returns
+   *  1.23
+   */
+  // floor2 - round down to 2 decimal places
+  // Takes a number and returns it, rounded to the nearest 2 decimal place.
+  floor2 (num) {
+    const thisNum = Number(num)
+
+    if (isNaN(thisNum)) throw new Error('input must be a number')
+
+    let tempNum = thisNum * 100
+    tempNum = Math.floor(tempNum)
+    tempNum = tempNum / 100
+
+    return tempNum
+  }
+
+  /**
+   * @api util.chunk20() chunk20()
+   * @apiName chunk20
+   * @apiGroup Util
+   * @apiDescription chunk up an array into multiple arrays of 20 elements each.
+   * Input: arrayToSlice - a one-dimensional array of elements.
+   * Returns a two-dimensional array. An array of 20-element arrays.
+   *
+   * @apiExample Example usage:
+   * (async () => {
+   *   try {
+   *      const bigArray = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]
+   *
+   *      const chunked = bchjs.Util.chunk20(bigArray)
+   *      console.log(chunked)
+   *   } catch(error) {
+   *      console.error(error)
+   *   }
+   * })()
+   *
+   * // returns
+   *  [
+   *    [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19],
+   *    [20,21,22,23,24,25,26]
+   *  ]
+   */
+  // chunk20 - chunk up an array into multiple arrays of 20 elements each.
+  // Input: arrayToSlice - a one-dimensional array of elements.
+  // Returns a two-dimensional array. An array of 20-element arrays.
+  chunk20 (arrayToSlice) {
+    try {
+      // Validate inputs
+      if (!Array.isArray(arrayToSlice)) {
+        throw new Error('input must be an array')
+      }
+
+      let offset = 0
+      const result = []
+
+      // Loop over the array and slice off chunks of 20 elements.
+      while (offset < arrayToSlice.length) {
+        const chunk = arrayToSlice.slice(offset, offset + 20)
+        result.push(chunk)
+        offset = offset + 20
+      }
+
+      return result
+    } catch (err) {
+      console.error('Error in chunk20()')
+      throw err
+    }
+  }
+
   /**
    * @api util.validateAddress() validateAddress()
    * @apiName Validate Address.

src/utxo.js

@@ -0,0 +1,348 @@
+/*
+  High-level functions for working with UTXOs
+
+  TODO:
+  - Make a getWL() clone of get(), but uses hydrateUtxosWL()
+*/
+
+// Local libraries
+const Electrumx = require('./electrumx')
+const Slp = require('./slp/slp')
+
+class UTXO {
+  constructor (config) {
+    // Encapsulate dependencies for easier mocking.
+    this.electrumx = new Electrumx(config)
+    this.slp = new Slp(config)
+  }
+
+  /**
+   * @api Utxo.get() get()
+   * @apiName get
+   * @apiGroup UTXO
+   * @apiDescription Get UTXOs for an address
+   *
+   * Given an address, this function will return an object with thre following
+   * properties:
+   * - address: "" - the address these UTXOs are associated with
+   * - bchUtxos: [] - UTXOs confirmed to be spendable as normal BCH
+   * - nullUtxo: [] - UTXOs that did not pass SLP validation. Should be ignored and
+   *   not spent, to be safe.
+   * - slpUtxos: {} - UTXOs confirmed to be colored as valid SLP tokens
+   *   - type1: {}
+   *     - tokens: [] - SLP token Type 1 tokens.
+   *     - mintBatons: [] - SLP token Type 1 mint batons.
+   *   - nft: {}
+   *     - tokens: [] - NFT tokens
+   *     - groupTokens: [] - NFT Group tokens, used to create NFT tokens.
+   *     - groupMintBatons: [] - Minting baton to create more NFT Group tokens.
+   *
+   * Note: You can pass in an optional second Boolean argument. The default
+   * `false` will use the normal waterfall validation method. Set to `true`,
+   * SLP UTXOs will be validated with the whitelist filtered SLPDB. This will
+   * result is many more UTXOs in the `nullUtxos` array.
+   *
+   * @apiExample Example usage:
+   * (async () => {
+   *   try {
+   *     let utxos = await bchjs.Utxo.get('simpleledger:qrm0c67wwqh0w7wjxua2gdt2xggnm90xwsr5k22euj');
+   *     console.log(utxos);
+   *   } catch(error) {
+   *    console.error(error)
+   *   }
+   * })()
+   *
+   * // returns
+   * [
+   *  {
+   *   "address": "bitcoincash:qrm0c67wwqh0w7wjxua2gdt2xggnm90xws00a3lezv",
+   *   "bchUtxos": [
+   *    {
+   *      "height": 674513,
+   *      "tx_hash": "705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04",
+   *      "tx_pos": 3,
+   *      "value": 38134,
+   *      "txid": "705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04",
+   *      "vout": 3,
+   *      "isValid": false
+   *    }
+   *   ],
+   *   "nullUtxos": [],
+   *   "slpUtxos": {
+   *    "type1": {
+   *      "mintBatons": [
+   *        {
+   *          "height": 674512,
+   *          "tx_hash": "acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230",
+   *          "tx_pos": 2,
+   *          "value": 546,
+   *          "txid": "acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230",
+   *          "vout": 2,
+   *          "utxoType": "minting-baton",
+   *          "tokenId": "acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230",
+   *          "tokenTicker": "SLPTEST",
+   *          "tokenName": "SLP Test Token",
+   *          "tokenDocumentUrl": "https://FullStack.cash",
+   *          "tokenDocumentHash": "",
+   *          "decimals": 8,
+   *          "tokenType": 1,
+   *          "isValid": true
+   *        }
+   *      ],
+   *      "tokens": [
+   *        {
+   *          "height": 674512,
+   *          "tx_hash": "acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230",
+   *          "tx_pos": 1,
+   *          "value": 546,
+   *          "txid": "acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230",
+   *          "vout": 1,
+   *          "utxoType": "token",
+   *          "tokenQty": "100",
+   *          "tokenId": "acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230",
+   *          "tokenTicker": "SLPTEST",
+   *          "tokenName": "SLP Test Token",
+   *          "tokenDocumentUrl": "https://FullStack.cash",
+   *          "tokenDocumentHash": "",
+   *          "decimals": 8,
+   *          "tokenType": 1,
+   *          "isValid": true
+   *        }
+   *      ]
+   *   },
+   *   "nft": {
+   *      "groupMintBatons": [
+   *        {
+   *          "height": 674513,
+   *          "tx_hash": "705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04",
+   *          "tx_pos": 2,
+   *          "value": 546,
+   *          "txid": "705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04",
+   *          "vout": 2,
+   *          "utxoType": "minting-baton",
+   *          "transactionType": "mint",
+   *          "tokenId": "a9a2458a0f9f0761d5b8725c256f2e7fa35b9de4dec6f47b46e9f20d92d0e395",
+   *          "tokenType": 129,
+   *          "tokenTicker": "NFTGT",
+   *          "tokenName": "NFT Test Group Token",
+   *          "tokenDocumentUrl": "https://FullStack.cash",
+   *          "tokenDocumentHash": "",
+   *          "decimals": 0,
+   *          "mintBatonVout": 2,
+   *          "isValid": true
+   *        }
+   *      ],
+   *      "groupTokens": [
+   *        {
+   *          "height": 674513,
+   *          "tx_hash": "705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04",
+   *          "tx_pos": 1,
+   *          "value": 546,
+   *          "txid": "705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04",
+   *          "vout": 1,
+   *          "utxoType": "token",
+   *          "tokenQty": "10",
+   *          "transactionType": "mint",
+   *          "tokenId": "a9a2458a0f9f0761d5b8725c256f2e7fa35b9de4dec6f47b46e9f20d92d0e395",
+   *          "tokenType": 129,
+   *          "tokenTicker": "NFTGT",
+   *          "tokenName": "NFT Test Group Token",
+   *          "tokenDocumentUrl": "https://FullStack.cash",
+   *          "tokenDocumentHash": "",
+   *          "decimals": 0,
+   *          "mintBatonVout": 2,
+   *          "isValid": true
+   *        }
+   *      ],
+   *      "tokens": [
+   *        {
+   *          "height": 674512,
+   *          "tx_hash": "eeddccc4d716f04157ea132ac93a48040fea34a6b57f3d8f0cccb7d1a731ab2b",
+   *          "tx_pos": 1,
+   *          "value": 546,
+   *          "txid": "eeddccc4d716f04157ea132ac93a48040fea34a6b57f3d8f0cccb7d1a731ab2b",
+   *          "vout": 1,
+   *          "utxoType": "token",
+   *          "tokenQty": "1",
+   *          "tokenId": "eeddccc4d716f04157ea132ac93a48040fea34a6b57f3d8f0cccb7d1a731ab2b",
+   *          "tokenTicker": "NFT004",
+   *          "tokenName": "NFT Child",
+   *          "tokenDocumentUrl": "https://FullStack.cash",
+   *          "tokenDocumentHash": "",
+   *          "decimals": 0,
+   *          "tokenType": 65,
+   *          "isValid": true
+   *        }
+   *      ]
+   *    }
+   *   }
+   *  }
+   * ]
+   *
+   *
+   */
+  async get (address, useWhitelist = false) {
+    try {
+      // Convert address to an array if it is a string.
+      if (typeof address === 'string') address = [address]
+
+      // Throw an error if there are more than 20 addresses passed in at a time.
+      if (address.length > 20) throw new Error('Too many elements, 20 max.')
+
+      // Covert each address to a BCH address.
+      const addr = address.map(elem => this.slp.Address.toCashAddress(elem))
+
+      // Get the UTXOs associated with the address.
+      const utxoData = await this.electrumx.utxo(addr)
+      // console.log(`utxoData: ${JSON.stringify(utxoData, null, 2)}`)
+
+      // Hydate the utxos with token information.
+      let hydratedUtxos
+      if (useWhitelist) {
+        hydratedUtxos = await this.slp.Utils.hydrateUtxosWL(utxoData.utxos)
+      } else {
+        hydratedUtxos = await this.slp.Utils.hydrateUtxos(utxoData.utxos)
+      }
+      // console.log(`hydratedUtxos: ${JSON.stringify(hydratedUtxos, null, 2)}`)
+
+      const retAry = [] // Return array
+
+      // Loop through each address.
+      for (let i = 0; i < hydratedUtxos.slpUtxos.length; i++) {
+        const thisAddr = hydratedUtxos.slpUtxos[i]
+
+        const addrObj = {
+          address: thisAddr.address
+        }
+
+        // Filter out the different types of UTXOs.
+        addrObj.bchUtxos = thisAddr.utxos.filter(elem => elem.isValid === false)
+        addrObj.nullUtxos = thisAddr.utxos.filter(elem => elem.isValid === null)
+
+        // Break down the SLP UTXOs.
+        addrObj.slpUtxos = {
+          type1: {},
+          nft: {}
+        }
+
+        // Token Type 1 Minting Batons.
+        addrObj.slpUtxos.type1.mintBatons = thisAddr.utxos.filter(elem => {
+          const isValid = elem.isValid === true
+          const tokenTypeIs1 = elem.tokenType === 1
+          const isMintingBaton = elem.utxoType === 'minting-baton'
+
+          return isValid && tokenTypeIs1 && isMintingBaton
+        })
+
+        // Token Type 1 tokens.
+        addrObj.slpUtxos.type1.tokens = thisAddr.utxos.filter(elem => {
+          const isValid = elem.isValid === true
+          const tokenTypeIs1 = elem.tokenType === 1
+          const isToken = elem.utxoType === 'token'
+
+          return isValid && tokenTypeIs1 && isToken
+        })
+
+        // NFT Group Minting Batons
+        addrObj.slpUtxos.nft.groupMintBatons = thisAddr.utxos.filter(elem => {
+          const isValid = elem.isValid === true
+          const tokenTypeIs129 = elem.tokenType === 129
+          const isMintingBaton = elem.utxoType === 'minting-baton'
+
+          return isValid && tokenTypeIs129 && isMintingBaton
+        })
+
+        // NFT Group tokens
+        addrObj.slpUtxos.nft.groupTokens = thisAddr.utxos.filter(elem => {
+          const isValid = elem.isValid === true
+          const tokenTypeIs129 = elem.tokenType === 129
+          const isToken = elem.utxoType === 'token'
+
+          return isValid && tokenTypeIs129 && isToken
+        })
+
+        // NFT (Child) tokens
+        addrObj.slpUtxos.nft.tokens = thisAddr.utxos.filter(elem => {
+          const isValid = elem.isValid === true
+          const tokenTypeIs65 = elem.tokenType === 65
+          const isToken = elem.utxoType === 'token'
+
+          return isValid && tokenTypeIs65 && isToken
+        })
+
+        retAry.push(addrObj)
+      }
+
+      return retAry
+    } catch (err) {
+      console.error('Error in bchjs.utxo.get()')
+      throw err
+    }
+  }
+
+  /**
+   * @api Utxo.findBiggestUtxo() findBiggestUtxo()
+   * @apiName findBiggestUtxo
+   * @apiGroup UTXO
+   * @apiDescription Get the biggest UTXO in an array.
+   *
+   * Given an array of BCH UTXOs, this method will return the biggest UTXO.
+   * This is often the simplest way to pick a UTXO for generating a transaction.
+   *
+   * @apiExample Example usage:
+   * (async () => {
+   *   try {
+   *     const utxos = await bchjs.Utxo.get('bitcoincash:qq54fgjn3hz0357n8a6guy4demw9xfkjk5jcj0xr0z');
+   *     const utxo = bchjs.Utxo.findBiggestUtxo(utxos[0].bchUtxos)
+   *     console.log(utxo);
+   *   } catch(error) {
+   *    console.error(error)
+   *   }
+   * })()
+   *
+   * // returns
+   *  {
+   *   "height": 655431,
+   *   "tx_hash": "7a091716f8137e94f87e7760648cd34a17e32754ef95f7c7bda38a635c9b2b1b",
+   *   "tx_pos": 0,
+   *   "value": 800,
+   *   "txid": "7a091716f8137e94f87e7760648cd34a17e32754ef95f7c7bda38a635c9b2b1b",
+   *   "vout": 0,
+   *   "isValid": false,
+   *   "satoshis": 800
+   *  }
+   */
+  // Returns the utxo with the biggest balance from an array of utxos.
+  findBiggestUtxo (utxos) {
+    let largestAmount = 0
+    let largestIndex = 0
+
+    if (!Array.isArray(utxos)) {
+      throw new Error('utxos input to findBiggestUtxo() must be an array')
+    }
+
+    for (let i = 0; i < utxos.length; i++) {
+      const thisUtxo = utxos[i]
+
+      // Give Elecrumx utxos a satoshis property.
+      if (thisUtxo.value) {
+        if (!thisUtxo.satoshis) thisUtxo.satoshis = Number(thisUtxo.value)
+      }
+
+      if (!thisUtxo.satoshis) {
+        throw new Error(
+          'UTXOs require a satoshis or value property for findBiggestUtxo()'
+        )
+      }
+
+      if (thisUtxo.satoshis > largestAmount) {
+        largestAmount = thisUtxo.satoshis
+        largestIndex = i
+      }
+    }
+
+    return utxos[largestIndex]
+  }
+}
+
+module.exports = UTXO

test/integration/chains/abc/rawtransaction.js

@@ -8,7 +8,7 @@
 const chai = require('chai')
 const assert = chai.assert
 const BCHJS = require('../../../../src/bch-js')
-const bchjs = new BCHJS()
+const bchjs = new BCHJS({ restURL: process.env.RESTURL })
 
 // Inspect utility used for debugging.
 const util = require('util')
@@ -44,6 +44,7 @@ describe('#rawtransaction', () => {
 
         assert.hasAllKeys(err, ['error'])
         assert.include(err.error, 'bad-txns-inputs-missingorspent')
+        // assert.include(err.error, 'Missing inputs')
       }
     })
 
@@ -61,6 +62,7 @@ describe('#rawtransaction', () => {
 
         assert.hasAllKeys(err, ['error'])
         assert.include(err.error, 'bad-txns-inputs-missingorspent')
+        // assert.include(err.error, 'Missing inputs')
       }
     })
   })

test/integration/chains/abc/slp.js

@@ -27,7 +27,7 @@ describe('#SLP', () => {
     // Introduce a delay so that the BVT doesn't trip the rate limits.
     if (process.env.IS_USING_FREE_TIER) await sleep(1000)
 
-    bchjs = new BCHJS()
+    bchjs = new BCHJS({ restURL: process.env.RESTURL })
   })
 
   describe('#util', () => {
@@ -113,6 +113,7 @@ describe('#SLP', () => {
 
         // Token send on BCHN network
         assert.equal(data[4].tx_hash, utxos[4].tx_hash)
+        // assert.equal(data[4].isValid, true)
         assert.equal(data[4].isValid, null)
 
         // Token send on ABC network
@@ -180,6 +181,7 @@ describe('#SLP', () => {
         assert.equal(result[0].valid, null)
         assert.equal(result[1].valid, null)
         assert.equal(result[2].valid, true)
+        // assert.equal(result[2].valid, null)
         assert.equal(result[3].valid, true)
         assert.equal(result[4].valid, null)
       })
@@ -209,6 +211,7 @@ describe('#SLP', () => {
         assert.equal(result[0].valid, null)
         assert.equal(result[1].valid, null)
         assert.equal(result[2].valid, true)
+        // assert.equal(result[2].valid, null)
         assert.equal(result[3].valid, true)
         assert.equal(result[4].valid, null)
         assert.equal(result[5].valid, true)

test/integration/chains/abc/utxo-integration.js

@@ -0,0 +1,34 @@
+/*
+  Integration tests for the utxo.js library.
+*/
+
+const assert = require('chai').assert
+
+const BCHJS = require('../../../../src/bch-js')
+const bchjs = new BCHJS()
+
+describe('#UTXO', () => {
+  beforeEach(async () => {
+    // sandbox = sinon.createSandbox()
+
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
+  describe('#get', () => {
+    it('should get hydrated and filtered UTXOs for an address', async () => {
+      // const addr = 'bitcoincash:qqh793x9au6ehvh7r2zflzguanlme760wuzehgzjh9'
+      const addr = 'simpleledger:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvyucjzqt9'
+
+      const result = await bchjs.Utxo.get(addr)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.isArray(result.bchUtxos)
+      assert.isArray(result.slpUtxos)
+      assert.isArray(result.nullUtxos)
+    })
+  })
+})
+
+function sleep (ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}

test/integration/chains/bchn/utxo-integration.js

@@ -0,0 +1,125 @@
+/*
+  Integration tests for the utxo.js library.
+*/
+
+const assert = require('chai').assert
+
+const BCHJS = require('../../../../src/bch-js')
+const bchjs = new BCHJS()
+
+describe('#UTXO', () => {
+  beforeEach(async () => {
+    // sandbox = sinon.createSandbox()
+
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
+  describe('#get', () => {
+    it('should get hydrated and filtered UTXOs for an address', async () => {
+      // const addr = 'bitcoincash:qqh793x9au6ehvh7r2zflzguanlme760wuzehgzjh9'
+      const addr = 'simpleledger:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvyucjzqt9'
+
+      const result = await bchjs.Utxo.get(addr)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.isArray(result)
+      assert.property(result[0], 'address')
+      assert.property(result[0], 'bchUtxos')
+      assert.property(result[0], 'nullUtxos')
+      assert.property(result[0], 'slpUtxos')
+      assert.isArray(result[0].bchUtxos)
+      assert.isArray(result[0].nullUtxos)
+    })
+
+    it('should handle an array of addresses', async () => {
+      const addr = [
+        'simpleledger:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvyucjzqt9',
+        'bitcoincash:qqh793x9au6ehvh7r2zflzguanlme760wuzehgzjh9'
+      ]
+
+      const result = await bchjs.Utxo.get(addr)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.isArray(result)
+      assert.property(result[0], 'address')
+      assert.property(result[0], 'bchUtxos')
+      assert.property(result[0], 'nullUtxos')
+      assert.property(result[0], 'slpUtxos')
+      assert.isArray(result[0].bchUtxos)
+      assert.isArray(result[0].nullUtxos)
+    })
+
+    it('should handle NFTs and minting batons', async () => {
+      const addr = 'simpleledger:qrm0c67wwqh0w7wjxua2gdt2xggnm90xwsr5k22euj'
+
+      const result = await bchjs.Utxo.get(addr)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.isArray(result)
+      assert.property(result[0], 'address')
+      assert.property(result[0], 'bchUtxos')
+      assert.property(result[0], 'nullUtxos')
+      assert.property(result[0], 'slpUtxos')
+      assert.isArray(result[0].bchUtxos)
+      assert.isArray(result[0].nullUtxos)
+
+      assert.isArray(result[0].slpUtxos.type1.mintBatons)
+      assert.isArray(result[0].slpUtxos.type1.tokens)
+      assert.isArray(result[0].slpUtxos.nft.groupMintBatons)
+      assert.isArray(result[0].slpUtxos.nft.groupTokens)
+      assert.isArray(result[0].slpUtxos.nft.tokens)
+    })
+
+    it('should use the whitelist when flag is set', async () => {
+      const addr = 'simpleledger:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvyucjzqt9'
+      const useWhitelist = true
+
+      const result = await bchjs.Utxo.get(addr, useWhitelist)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.isArray(result)
+      assert.property(result[0], 'address')
+      assert.property(result[0], 'bchUtxos')
+      assert.property(result[0], 'nullUtxos')
+      assert.property(result[0], 'slpUtxos')
+      assert.isArray(result[0].bchUtxos)
+      assert.isArray(result[0].nullUtxos)
+
+      // Most token UTXOs should end up in the nullUtxos array.
+      assert.isAbove(result[0].bchUtxos.length, 0)
+      assert.isAbove(result[0].nullUtxos.length, 1)
+    })
+  })
+
+  describe('#findBiggestUtxo', () => {
+    it('should sort UTXOs from Electrumx', async () => {
+      const addr = 'bitcoincash:qq54fgjn3hz0357n8a6guy4demw9xfkjk5jcj0xr0z'
+
+      const electrumxUtxos = await bchjs.Electrumx.utxo(addr)
+      // console.log(`Electrumx utxos: ${JSON.stringify(electrumxUtxos, null, 2)}`)
+
+      const result = bchjs.Utxo.findBiggestUtxo(electrumxUtxos.utxos)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.property(result, 'satoshis')
+      assert.equal(result.satoshis, 800)
+    })
+
+    it('should sort UTXOs from Utxos.get()', async () => {
+      const addr = 'bitcoincash:qq54fgjn3hz0357n8a6guy4demw9xfkjk5jcj0xr0z'
+
+      const utxos = await bchjs.Utxo.get(addr)
+      // console.log(`utxos: ${JSON.stringify(utxos, null, 2)}`)
+
+      const result = bchjs.Utxo.findBiggestUtxo(utxos[0].bchUtxos)
+      console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.property(result, 'satoshis')
+      assert.equal(result.satoshis, 800)
+    })
+  })
+})
+
+function sleep (ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}

test/integration/implementations/sweet/rawtransaction.js

@@ -1,71 +0,0 @@
-/*
-  Integration tests for the bchjs. Only covers calls made to
-  rest.bitcoin.com.
-
-  TODO
-*/
-
-const chai = require('chai')
-const assert = chai.assert
-const BCHJS = require('../../../../src/bch-js')
-const bchjs = new BCHJS()
-
-// Inspect utility used for debugging.
-const util = require('util')
-util.inspect.defaultOptions = {
-  showHidden: true,
-  colors: true,
-  depth: 3
-}
-
-describe('#rawtransaction', () => {
-  beforeEach(async () => {
-    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
-  })
-
-  /*
-    Testing sentRawTransaction isn't really possible with an integration test,
-    as the endpoint really needs an e2e test to be properly tested. The tests
-    below expect error messages returned from the server, but at least test
-    that the server is responding on those endpoints, and responds consistently.
-  */
-  describe('sendRawTransaction', () => {
-    it('should send a single transaction hex', async () => {
-      try {
-        const hex =
-          '01000000013ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a000000006a4730440220540986d1c58d6e76f8f05501c520c38ce55393d0ed7ed3c3a82c69af04221232022058ea43ed6c05fec0eccce749a63332ed4525460105346f11108b9c26df93cd72012103083dfc5a0254613941ddc91af39ff90cd711cdcde03a87b144b883b524660c39ffffffff01807c814a000000001976a914d7e7c4e0b70eaa67ceff9d2823d1bbb9f6df9a5188ac00000000'
-
-        await bchjs.RawTransactions.sendRawTransaction(hex)
-        // console.log(`result ${JSON.stringify(result, null, 2)}`)
-
-        assert.equal(true, false, 'Unexpected result!')
-      } catch (err) {
-        // console.log(`err: ${util.inspect(err)}`)
-
-        assert.hasAllKeys(err, ['error'])
-        assert.include(err.error, 'Missing inputs')
-      }
-    })
-
-    it('should send an array of tx hexes', async () => {
-      try {
-        const hexes = [
-          '01000000013ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a000000006a4730440220540986d1c58d6e76f8f05501c520c38ce55393d0ed7ed3c3a82c69af04221232022058ea43ed6c05fec0eccce749a63332ed4525460105346f11108b9c26df93cd72012103083dfc5a0254613941ddc91af39ff90cd711cdcde03a87b144b883b524660c39ffffffff01807c814a000000001976a914d7e7c4e0b70eaa67ceff9d2823d1bbb9f6df9a5188ac00000000',
-          '01000000013ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a000000006a4730440220540986d1c58d6e76f8f05501c520c38ce55393d0ed7ed3c3a82c69af04221232022058ea43ed6c05fec0eccce749a63332ed4525460105346f11108b9c26df93cd72012103083dfc5a0254613941ddc91af39ff90cd711cdcde03a87b144b883b524660c39ffffffff01807c814a000000001976a914d7e7c4e0b70eaa67ceff9d2823d1bbb9f6df9a5188ac00000000'
-        ]
-
-        const result = await bchjs.RawTransactions.sendRawTransaction(hexes)
-        console.log(`result ${JSON.stringify(result, null, 2)}`)
-      } catch (err) {
-        // console.log(`err: ${util.inspect(err)}`)
-
-        assert.hasAllKeys(err, ['error'])
-        assert.include(err.error, 'Missing inputs')
-      }
-    })
-  })
-})
-
-function sleep (ms) {
-  return new Promise(resolve => setTimeout(resolve, ms))
-}

test/integration/implementations/sweet/slp.js

@@ -1,246 +0,0 @@
-/*
-  Integration tests for the bchjs covering SLP tokens.
-  These tests are specific to the ABC chain.
-*/
-
-const chai = require('chai')
-const assert = chai.assert
-
-const BCHJS = require('../../../../src/bch-js')
-let bchjs
-
-// Inspect utility used for debugging.
-const util = require('util')
-util.inspect.defaultOptions = {
-  showHidden: true,
-  colors: true,
-  depth: 1
-}
-
-describe('#SLP', () => {
-  // before(() => {
-  //   console.log(`bchjs.SLP.restURL: ${bchjs.SLP.restURL}`)
-  //   console.log(`bchjs.SLP.apiToken: ${bchjs.SLP.apiToken}`)
-  // })
-
-  beforeEach(async () => {
-    // Introduce a delay so that the BVT doesn't trip the rate limits.
-    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
-
-    bchjs = new BCHJS()
-  })
-
-  describe('#util', () => {
-    describe('#tokenUtxoDetails', () => {
-      it('should handle a range of UTXO types', async () => {
-        const utxos = [
-          // Malformed SLP tx
-          {
-            note: 'Malformed SLP tx',
-            tx_hash:
-              'f7e5199ef6669ad4d078093b3ad56e355b6ab84567e59ad0f08a5ad0244f783a',
-            tx_pos: 1,
-            value: 546
-          },
-          // Normal TX (non-SLP)
-          {
-            note: 'Normal TX (non-SLP)',
-            tx_hash:
-              '01cdaec2f8b311fc2d6ecc930247bd45fa696dc204ab684596e281fe1b06c1f0',
-            tx_pos: 0,
-            value: 400000
-          },
-          // Valid PSF SLP tx
-          {
-            note: 'Valid PSF SLP tx',
-            tx_hash:
-              'daf4d8b8045e7a90b7af81bfe2370178f687da0e545511bce1c9ae539eba5ffd',
-            tx_pos: 1,
-            value: 546
-          },
-          // Valid SLP token not in whitelist
-          {
-            note: 'Valid SLP token not in whitelist',
-            tx_hash:
-              '3a4b628cbcc183ab376d44ce5252325f042268307ffa4a53443e92b6d24fb488',
-            tx_pos: 1,
-            value: 546
-          },
-          // Token send on BCHN network.
-          {
-            note: 'Token send on BCHN network',
-            tx_hash:
-              '402c663379d9699b6e2dd38737061e5888c5a49fca77c97ab98e79e08959e019',
-            tx_pos: 1,
-            value: 546
-          },
-          // Token send on ABC network.
-          {
-            note: 'Token send on ABC network',
-            tx_hash:
-              '336bfe2168aac4c3303508a9e8548a0d33797a83b85b76a12d845c8d6674f79d',
-            tx_pos: 1,
-            value: 546
-          },
-          // Known invalid SLP token send of PSF tokens.
-          {
-            note: 'Known invalid SLP token send of PSF tokens',
-            tx_hash:
-              '2bf691ad3679d928fef880b8a45b93b233f8fa0d0a92cf792313dbe77b1deb74',
-            tx_pos: 1,
-            value: 546
-          }
-        ]
-
-        const data = await bchjs.SLP.Utils.tokenUtxoDetails(utxos)
-        // console.log(`data: ${JSON.stringify(data, null, 2)}`)
-
-        // Malformed SLP tx
-        assert.equal(data[0].tx_hash, utxos[0].tx_hash)
-        assert.equal(data[0].isValid, false)
-
-        // Normal TX (non-SLP)
-        assert.equal(data[1].tx_hash, utxos[1].tx_hash)
-        assert.equal(data[1].isValid, false)
-
-        // Valid PSF SLP tx
-        assert.equal(data[2].tx_hash, utxos[2].tx_hash)
-        assert.equal(data[2].isValid, true)
-
-        // Valid SLP token not in whitelist
-        assert.equal(data[3].tx_hash, utxos[3].tx_hash)
-        assert.equal(data[3].isValid, true)
-
-        // Token send on BCHN network
-        assert.equal(data[4].tx_hash, utxos[4].tx_hash)
-        assert.equal(data[4].isValid, true)
-
-        // Token send on ABC network
-        assert.equal(data[5].tx_hash, utxos[5].tx_hash)
-        assert.equal(data[5].isValid, null)
-
-        // Known invalid SLP token send of PSF tokens
-        assert.equal(data[6].tx_hash, utxos[6].tx_hash)
-        assert.equal(data[6].isValid, false)
-      })
-    })
-
-    describe('#validateTxid3', () => {
-      it('should invalidate a known invalid TXID', async () => {
-        const txid =
-          'f7e5199ef6669ad4d078093b3ad56e355b6ab84567e59ad0f08a5ad0244f783a'
-
-        const result = await bchjs.SLP.Utils.validateTxid3(txid)
-        // console.log(`result: ${JSON.stringify(result, null, 2)}`)
-
-        assert.isArray(result)
-
-        assert.property(result[0], 'txid')
-        assert.equal(result[0].txid, txid)
-
-        assert.property(result[0], 'valid')
-        assert.equal(result[0].valid, null)
-      })
-
-      it('should validate a known valid TXID', async () => {
-        const txid =
-          'daf4d8b8045e7a90b7af81bfe2370178f687da0e545511bce1c9ae539eba5ffd'
-
-        const result = await bchjs.SLP.Utils.validateTxid3(txid)
-        // console.log(`result: ${JSON.stringify(result, null, 2)}`)
-
-        assert.isArray(result)
-
-        assert.property(result[0], 'txid')
-        assert.equal(result[0].txid, txid)
-
-        assert.property(result[0], 'valid')
-        assert.equal(result[0].valid, true)
-      })
-
-      it('should handle a mix of valid, invalid, and non-SLP txs', async () => {
-        const txids = [
-          // Malformed SLP tx
-          'f7e5199ef6669ad4d078093b3ad56e355b6ab84567e59ad0f08a5ad0244f783a',
-          // Normal TX (non-SLP)
-          '01cdaec2f8b311fc2d6ecc930247bd45fa696dc204ab684596e281fe1b06c1f0',
-          // Valid PSF SLP tx
-          'daf4d8b8045e7a90b7af81bfe2370178f687da0e545511bce1c9ae539eba5ffd',
-          // Valid SLP token not in whitelist
-          '3a4b628cbcc183ab376d44ce5252325f042268307ffa4a53443e92b6d24fb488',
-          // Unprocessed SLP TX
-          '402c663379d9699b6e2dd38737061e5888c5a49fca77c97ab98e79e08959e019'
-        ]
-
-        const result = await bchjs.SLP.Utils.validateTxid3(txids)
-        // console.log(`result: ${JSON.stringify(result, null, 2)}`)
-
-        assert.isArray(result)
-
-        assert.equal(result[0].txid, txids[0])
-        assert.equal(result[0].valid, null)
-
-        assert.equal(result[1].txid, txids[1])
-        assert.equal(result[1].valid, null)
-
-        assert.equal(result[2].txid, txids[2])
-        assert.equal(result[2].valid, true)
-
-        // True in validateTxid()
-        assert.equal(result[3].txid, txids[3])
-        assert.equal(result[3].valid, true)
-
-        assert.equal(result[4].txid, txids[4])
-        assert.equal(result[4].valid, true)
-      })
-    })
-
-    describe('#validateTxid', () => {
-      it('should handle a mix of valid, invalid, and non-SLP txs', async () => {
-        const txids = [
-          // Malformed SLP tx
-          'f7e5199ef6669ad4d078093b3ad56e355b6ab84567e59ad0f08a5ad0244f783a',
-          // Normal TX (non-SLP)
-          '01cdaec2f8b311fc2d6ecc930247bd45fa696dc204ab684596e281fe1b06c1f0',
-          // Valid PSF SLP tx
-          'daf4d8b8045e7a90b7af81bfe2370178f687da0e545511bce1c9ae539eba5ffd',
-          // Valid SLP token not in whitelist
-          '3a4b628cbcc183ab376d44ce5252325f042268307ffa4a53443e92b6d24fb488',
-          // Token send on BCHN network.
-          '402c663379d9699b6e2dd38737061e5888c5a49fca77c97ab98e79e08959e019',
-          // Token send on ABC network.
-          '336bfe2168aac4c3303508a9e8548a0d33797a83b85b76a12d845c8d6674f79d'
-        ]
-
-        const result = await bchjs.SLP.Utils.validateTxid(txids)
-        // console.log(`result: ${JSON.stringify(result, null, 2)}`)
-
-        assert.isArray(result)
-
-        assert.equal(result[0].txid, txids[0])
-        assert.equal(result[0].valid, null)
-
-        assert.equal(result[1].txid, txids[1])
-        assert.equal(result[1].valid, null)
-
-        assert.equal(result[2].txid, txids[2])
-        assert.equal(result[2].valid, true)
-
-        // True in validateTxid() but null in validateTxid3()
-        assert.equal(result[3].txid, txids[3])
-        assert.equal(result[3].valid, true)
-
-        assert.equal(result[4].txid, txids[4])
-        assert.equal(result[4].valid, true)
-
-        assert.equal(result[5].txid, txids[5])
-        assert.equal(result[5].valid, null)
-      })
-    })
-  })
-})
-
-// Promise-based sleep function
-function sleep (ms) {
-  return new Promise(resolve => setTimeout(resolve, ms))
-}

test/integration/slp.js

@@ -766,6 +766,99 @@ describe('#SLP', () => {
       })
     })
 
+    describe('#hydrateUtxosWL', () => {
+      it('should hydrate UTXOs', async () => {
+        const utxos = [
+          {
+            utxos: [
+              {
+                txid:
+                  '89b3f0c84efe8b01b24e2d7ac08636de5781f31dbb84478e3de868ca0a7ed93a',
+                vout: 1,
+                value: 546
+              }
+            ]
+          }
+        ]
+
+        const result = await bchjs.SLP.Utils.hydrateUtxosWL(utxos)
+        // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+        // Test the general structure of the output.
+        assert.isArray(result.slpUtxos)
+        assert.equal(result.slpUtxos.length, 1)
+        assert.equal(result.slpUtxos[0].utxos.length, 1)
+
+        // Test the non-slp UTXO.
+        assert.property(result.slpUtxos[0].utxos[0], 'txid')
+        assert.property(result.slpUtxos[0].utxos[0], 'vout')
+        assert.property(result.slpUtxos[0].utxos[0], 'value')
+        assert.property(result.slpUtxos[0].utxos[0], 'isValid')
+        assert.equal(result.slpUtxos[0].utxos[0].isValid, true)
+      })
+
+      it('should process data directly from Electrumx', async () => {
+        const addrs = [
+          'bitcoincash:qqnt53cfw990u6y38xgezm0lfa8hknw0wueezcpagp',
+          'bitcoincash:qrh3qgtax6adegzc7zxm6m4sgrv9wq28yqnfn33ce5',
+          'bitcoincash:qqcaee5w4ws77n8s2gzy6fwtma6uxd7ctq8553e495'
+        ]
+
+        const utxos = await bchjs.Electrumx.utxo(addrs)
+        // console.log(`utxos: ${JSON.stringify(utxos, null, 2)}`)
+
+        const result = await bchjs.SLP.Utils.hydrateUtxosWL(utxos.utxos)
+        // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+        // Test the general structure of the output.
+        assert.isArray(result.slpUtxos)
+        assert.equal(result.slpUtxos.length, 3)
+        assert.equal(result.slpUtxos[0].utxos.length, 1)
+        assert.equal(result.slpUtxos[1].utxos.length, 1)
+        assert.equal(result.slpUtxos[2].utxos.length, 2)
+
+        try {
+          // Test the expected values.
+          assert.equal(result.slpUtxos[0].utxos[0].isValid, false)
+          assert.equal(result.slpUtxos[1].utxos[0].isValid, true)
+          assert.equal(result.slpUtxos[1].utxos[0].tokenTicker, 'TROUT')
+          assert.equal(result.slpUtxos[2].utxos[0].isValid, false)
+          // assert.equal(result.slpUtxos[2].utxos[1].isValid, null)
+          assert.equal(result.slpUtxos[2].utxos[1].tokenTicker, 'VALENTINE')
+        } catch (err) {
+          console.error(
+            'The hydrateUtxos call may hitting rate limits, or SLPDB may be having issues if "isValid" results are "null"'
+          )
+          console.log('Error: ', err)
+        }
+      })
+
+      it('should handle null SLPDB validations', async () => {
+        const utxos = [
+          {
+            height: 665577,
+            tx_hash:
+              '4b89405c54d1c0bde8aa476a47561a42a6e7a5e927daa2ec69d428810eae3419',
+            tx_pos: 1,
+            value: 546
+          },
+          {
+            height: 665577,
+            tx_hash:
+              'f7e5199ef6669ad4d078093b3ad56e355b6ab84567e59ad0f08a5ad0244f783a',
+            tx_pos: 1,
+            value: 546
+          }
+        ]
+
+        const data = await bchjs.SLP.Utils.hydrateUtxosWL([{ utxos: utxos }])
+        // console.log(`data: ${JSON.stringify(data, null, 2)}`)
+
+        assert.isArray(data.slpUtxos)
+        assert.equal(data.slpUtxos[0].isValid, null)
+      })
+    })
+
     describe('#validateTxid', () => {
       // This test is not necessary.
       it('should handle a null response from SLPDB', async () => {

test/unit/control.js

@@ -5,11 +5,11 @@ const bchjs = new BCHJS()
 const sinon = require('sinon')
 
 describe('#Control', () => {
-  describe('#getNetworkInfo', () => {
-    let sandbox
-    beforeEach(() => (sandbox = sinon.createSandbox()))
-    afterEach(() => sandbox.restore())
+  let sandbox
+  beforeEach(() => (sandbox = sinon.createSandbox()))
+  afterEach(() => sandbox.restore())
 
+  describe('#getNetworkInfo', () => {
     it('should get info', done => {
       const data = {
         version: 170000,
@@ -36,10 +36,6 @@ describe('#Control', () => {
   })
 
   describe('#getMemoryInfo', () => {
-    let sandbox
-    beforeEach(() => (sandbox = sinon.createSandbox()))
-    afterEach(() => sandbox.restore())
-
     it('should get memory info', done => {
       const data = {
         locked: {

test/unit/fixtures/utxo-mocks.js

@@ -0,0 +1,289 @@
+const mockUtxoData = {
+  success: true,
+  utxos: [
+    {
+      utxos: [
+        {
+          height: 569108,
+          tx_hash:
+            '384e1b8197e8de7d38f98317af2cf5f6bcb50007c46943b3498a6fab6e8aeb7c',
+          tx_pos: 1,
+          value: 546
+        },
+        {
+          height: 674331,
+          tx_hash:
+            '5e86cd911110e4f5db0cc3e8f459d5e8850b49adf57059a71daee674b2867b31',
+          tx_pos: 0,
+          value: 1000
+        }
+      ],
+      address: 'bitcoincash:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvg8nfhq4m'
+    }
+  ]
+}
+
+const mockHydratedUtxos = {
+  slpUtxos: [
+    {
+      utxos: [
+        {
+          height: 569108,
+          tx_hash:
+            '384e1b8197e8de7d38f98317af2cf5f6bcb50007c46943b3498a6fab6e8aeb7c',
+          tx_pos: 1,
+          value: 546,
+          txid:
+            '384e1b8197e8de7d38f98317af2cf5f6bcb50007c46943b3498a6fab6e8aeb7c',
+          vout: 1,
+          utxoType: 'token',
+          transactionType: 'send',
+          tokenId:
+            'a436c8e1b6bee3d701c6044d190f76f774be83c36de8d34a988af4489e86dd37',
+          tokenTicker: 'sleven',
+          tokenName: 'sleven',
+          tokenDocumentUrl: 'sleven',
+          tokenDocumentHash: '',
+          decimals: 7,
+          tokenType: 1,
+          tokenQty: '1',
+          isValid: true
+        },
+        {
+          height: 674331,
+          tx_hash:
+            '5e86cd911110e4f5db0cc3e8f459d5e8850b49adf57059a71daee674b2867b31',
+          tx_pos: 0,
+          value: 1000,
+          txid:
+            '5e86cd911110e4f5db0cc3e8f459d5e8850b49adf57059a71daee674b2867b31',
+          vout: 0,
+          isValid: false
+        }
+      ],
+      address: 'bitcoincash:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvg8nfhq4m'
+    }
+  ]
+}
+
+const mockTwoHydratedAddrs = {
+  slpUtxos: [
+    {
+      utxos: [
+        {
+          height: 569108,
+          tx_hash:
+            '384e1b8197e8de7d38f98317af2cf5f6bcb50007c46943b3498a6fab6e8aeb7c',
+          tx_pos: 1,
+          value: 546,
+          txid:
+            '384e1b8197e8de7d38f98317af2cf5f6bcb50007c46943b3498a6fab6e8aeb7c',
+          vout: 1,
+          utxoType: 'token',
+          transactionType: 'send',
+          tokenId:
+            'a436c8e1b6bee3d701c6044d190f76f774be83c36de8d34a988af4489e86dd37',
+          tokenTicker: 'sleven',
+          tokenName: 'sleven',
+          tokenDocumentUrl: 'sleven',
+          tokenDocumentHash: '',
+          decimals: 7,
+          tokenType: 1,
+          tokenQty: '1',
+          isValid: true
+        },
+        {
+          height: 674331,
+          tx_hash:
+            '5e86cd911110e4f5db0cc3e8f459d5e8850b49adf57059a71daee674b2867b31',
+          tx_pos: 0,
+          value: 1000,
+          txid:
+            '5e86cd911110e4f5db0cc3e8f459d5e8850b49adf57059a71daee674b2867b31',
+          vout: 0,
+          isValid: false
+        }
+      ],
+      address: 'bitcoincash:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvg8nfhq4m'
+    },
+    {
+      utxos: [
+        {
+          height: 602405,
+          tx_hash:
+            '2b37bdb3b63dd0bca720437754a36671431a950e684b64c44ea910ea9d5297c7',
+          tx_pos: 0,
+          value: 1000,
+          txid:
+            '2b37bdb3b63dd0bca720437754a36671431a950e684b64c44ea910ea9d5297c7',
+          vout: 0,
+          isValid: false
+        }
+      ],
+      address: 'bitcoincash:qqh793x9au6ehvh7r2zflzguanlme760wuzehgzjh9'
+    }
+  ]
+}
+
+const mockEveryUtxoType = {
+  slpUtxos: [
+    {
+      utxos: [
+        {
+          height: 674512,
+          tx_hash:
+            'acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230',
+          tx_pos: 1,
+          value: 546,
+          txid:
+            'acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230',
+          vout: 1,
+          utxoType: 'token',
+          tokenQty: '100',
+          tokenId:
+            'acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230',
+          tokenTicker: 'SLPTEST',
+          tokenName: 'SLP Test Token',
+          tokenDocumentUrl: 'https://FullStack.cash',
+          tokenDocumentHash: '',
+          decimals: 8,
+          tokenType: 1,
+          isValid: true
+        },
+        {
+          height: 674512,
+          tx_hash:
+            'acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230',
+          tx_pos: 2,
+          value: 546,
+          txid:
+            'acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230',
+          vout: 2,
+          utxoType: 'minting-baton',
+          tokenId:
+            'acbb0d3ceef55aa3e5fafc19335ae4bf2f8edba3c0567547dfd402391db32230',
+          tokenTicker: 'SLPTEST',
+          tokenName: 'SLP Test Token',
+          tokenDocumentUrl: 'https://FullStack.cash',
+          tokenDocumentHash: '',
+          decimals: 8,
+          tokenType: 1,
+          isValid: true
+        },
+        {
+          height: 674512,
+          tx_hash:
+            'eeddccc4d716f04157ea132ac93a48040fea34a6b57f3d8f0cccb7d1a731ab2b',
+          tx_pos: 1,
+          value: 546,
+          txid:
+            'eeddccc4d716f04157ea132ac93a48040fea34a6b57f3d8f0cccb7d1a731ab2b',
+          vout: 1,
+          utxoType: 'token',
+          tokenQty: '1',
+          tokenId:
+            'eeddccc4d716f04157ea132ac93a48040fea34a6b57f3d8f0cccb7d1a731ab2b',
+          tokenTicker: 'NFT004',
+          tokenName: 'NFT Child',
+          tokenDocumentUrl: 'https://FullStack.cash',
+          tokenDocumentHash: '',
+          decimals: 0,
+          tokenType: 65,
+          isValid: true
+        },
+        {
+          height: 674513,
+          tx_hash:
+            '705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04',
+          tx_pos: 1,
+          value: 546,
+          txid:
+            '705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04',
+          vout: 1,
+          utxoType: 'token',
+          tokenQty: '10',
+          transactionType: 'mint',
+          tokenId:
+            'a9a2458a0f9f0761d5b8725c256f2e7fa35b9de4dec6f47b46e9f20d92d0e395',
+          tokenType: 129,
+          tokenTicker: 'NFTGT',
+          tokenName: 'NFT Test Group Token',
+          tokenDocumentUrl: 'https://FullStack.cash',
+          tokenDocumentHash: '',
+          decimals: 0,
+          mintBatonVout: 2,
+          isValid: true
+        },
+        {
+          height: 674513,
+          tx_hash:
+            '705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04',
+          tx_pos: 2,
+          value: 546,
+          txid:
+            '705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04',
+          vout: 2,
+          utxoType: 'minting-baton',
+          transactionType: 'mint',
+          tokenId:
+            'a9a2458a0f9f0761d5b8725c256f2e7fa35b9de4dec6f47b46e9f20d92d0e395',
+          tokenType: 129,
+          tokenTicker: 'NFTGT',
+          tokenName: 'NFT Test Group Token',
+          tokenDocumentUrl: 'https://FullStack.cash',
+          tokenDocumentHash: '',
+          decimals: 0,
+          mintBatonVout: 2,
+          isValid: true
+        },
+        {
+          height: 674513,
+          tx_hash:
+            '705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04',
+          tx_pos: 3,
+          value: 38134,
+          txid:
+            '705bcc442e5a2770e560b528f52a47b1dcc9ce9ab6a8de9dfdefa55177f00d04',
+          vout: 3,
+          isValid: false
+        }
+      ],
+      address: 'bitcoincash:qrm0c67wwqh0w7wjxua2gdt2xggnm90xws00a3lezv'
+    }
+  ]
+}
+
+const electrumxUtxos = {
+  success: true,
+  utxos: [
+    {
+      height: 0,
+      tx_hash:
+        '192f5037bb3822afd92d6b6ab51842a5dcfbe6bff783290057342da1f27ed414',
+      tx_pos: 0,
+      value: 600
+    },
+    {
+      height: 0,
+      tx_hash:
+        'f913646f7c180f8de020cb1387951272e8a3f764a0f88e68f7fc1145a0bf02e9',
+      tx_pos: 0,
+      value: 700
+    },
+    {
+      height: 0,
+      tx_hash:
+        '7a091716f8137e94f87e7760648cd34a17e32754ef95f7c7bda38a635c9b2b1b',
+      tx_pos: 0,
+      value: 800
+    }
+  ]
+}
+
+module.exports = {
+  mockUtxoData,
+  mockHydratedUtxos,
+  mockTwoHydratedAddrs,
+  mockEveryUtxoType,
+  electrumxUtxos
+}

test/unit/slp-utils.js

@@ -1716,6 +1716,21 @@ describe('#SLP Utils', () => {
     })
   })
 
+  describe('#hydrateUtxosWL', () => {
+    it('should throw an error if input is not an array', async () => {
+      try {
+        const utxos = 1234
+
+        await uut.Utils.hydrateUtxosWL(utxos)
+
+        assert.equal(true, false, 'Uh oh. Code path should not end here.')
+      } catch (err) {
+        // console.log(`Error: `, err)
+        assert.include(err.message, 'Input must be an array.')
+      }
+    })
+  })
+
   describe('#validateTxid2', () => {
     it('should throw an error if the input is an array', async () => {
       try {

test/unit/util.js

@@ -1,4 +1,5 @@
 const assert = require('assert')
+const assert2 = require('chai').assert
 const axios = require('axios')
 const BCHJS = require('../../src/bch-js')
 const bchjs = new BCHJS()
@@ -32,4 +33,143 @@ describe('#Util', () => {
         .then(done, done)
     })
   })
+
+  describe('#floor8', () => {
+    it('should floor a number to 8 decimals', () => {
+      const num = 1.234567891111
+
+      const result = bchjs.Util.floor8(num)
+      // console.log(result)
+
+      assert2.equal(result, 1.23456789)
+    })
+
+    it('should throw an error for non-number input', () => {
+      try {
+        const num = 'string'
+
+        bchjs.Util.floor8(num)
+
+        assert2.equal(true, false, 'Unexpected result')
+      } catch (err) {
+        // console.log(err)
+        assert2.include(err.message, 'input must be a number')
+      }
+    })
+
+    it('should not effect a number with less than 8 decimals', () => {
+      const num = 1.23
+
+      const result = bchjs.Util.floor8(num)
+      // console.log(result)
+
+      assert2.equal(result, 1.23)
+    })
+  })
+
+  describe('#floor2', () => {
+    it('should round a number to 2 decimals', () => {
+      const num = 1.234567891111
+
+      const result = bchjs.Util.floor2(num)
+      // console.log(result)
+
+      assert2.equal(result, 1.23)
+    })
+
+    it('should throw an error for non-number input', () => {
+      try {
+        const num = 'string'
+
+        bchjs.Util.floor2(num)
+
+        assert2.equal(true, false, 'Unexpected result')
+      } catch (err) {
+        // console.log(err)
+        assert2.include(err.message, 'input must be a number')
+      }
+    })
+
+    it('should not effect a number with less than 8 decimals', () => {
+      const num = 1.2
+
+      const result = bchjs.Util.floor2(num)
+      // console.log(result)
+
+      assert2.equal(result, 1.2)
+    })
+  })
+
+  describe('#chunk20', () => {
+    const thirtyFiveElements = [
+      0,
+      1,
+      2,
+      3,
+      4,
+      5,
+      6,
+      7,
+      8,
+      9,
+      10,
+      11,
+      12,
+      13,
+      14,
+      15,
+      16,
+      17,
+      18,
+      19,
+      20,
+      21,
+      22,
+      23,
+      24,
+      25,
+      26,
+      27,
+      28,
+      29,
+      30,
+      31,
+      32,
+      33,
+      34
+    ]
+
+    it('should split 35 elements into 2 arrays', () => {
+      const result = bchjs.Util.chunk20(thirtyFiveElements)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert2.isArray(result)
+      assert2.isArray(result[0])
+      assert2.equal(result.length, 2)
+      assert2.equal(result[0].length, 20)
+    })
+
+    it('should return accurately with an array of less than 20 elements', () => {
+      const elems = [0, 1, 2, 3, 4, 5]
+
+      const result = bchjs.Util.chunk20(elems)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert2.isArray(result)
+      assert2.isArray(result[0])
+      assert2.equal(result.length, 1)
+      assert2.equal(result[0].length, 6)
+    })
+
+    it('should throw an error for non-array input', () => {
+      try {
+        bchjs.Util.chunk20('string')
+
+        assert2.equal(true, false, 'Unexpected result')
+      } catch (err) {
+        // console.log(err)
+        assert2.include(err.message, 'input must be an array')
+      }
+    })
+  })
 })

test/unit/utxo-unit.js

@@ -0,0 +1,191 @@
+/*
+  Unit tests for the utxo.js library.
+*/
+
+const sinon = require('sinon')
+const assert = require('chai').assert
+
+const BCHJS = require('../../src/bch-js')
+const bchjs = new BCHJS()
+
+const mockData = require('./fixtures/utxo-mocks')
+
+describe('#utxo', () => {
+  let sandbox
+  beforeEach(() => (sandbox = sinon.createSandbox()))
+  afterEach(() => sandbox.restore())
+
+  describe('#get', () => {
+    it('should get hydrated and filtered UTXOs for an address', async () => {
+      // Mock dependencies.
+      sandbox.stub(bchjs.Utxo.electrumx, 'utxo').resolves(mockData.mockUtxoData)
+      sandbox
+        .stub(bchjs.Utxo.slp.Utils, 'hydrateUtxos')
+        .resolves(mockData.mockHydratedUtxos)
+
+      const addr = 'simpleledger:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvyucjzqt9'
+
+      const result = await bchjs.Utxo.get(addr)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.isArray(result)
+      assert.property(result[0], 'address')
+      assert.property(result[0], 'bchUtxos')
+      assert.property(result[0], 'nullUtxos')
+      assert.property(result[0], 'slpUtxos')
+      assert.isArray(result[0].bchUtxos)
+      assert.isArray(result[0].nullUtxos)
+    })
+
+    it('should catch and throw an error', async () => {
+      try {
+        // Force an error
+        sandbox
+          .stub(bchjs.Utxo.electrumx, 'utxo')
+          .rejects(new Error('test error'))
+
+        const addr = 'simpleledger:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvyucjzqt9'
+
+        await bchjs.Utxo.get(addr)
+
+        assert.fail('Unexpected code path')
+      } catch (err) {
+        assert.include(err.message, 'test error')
+      }
+    })
+
+    it('should handle an array of addresses', async () => {
+      // Mock dependencies.
+      sandbox.stub(bchjs.Utxo.electrumx, 'utxo').resolves({ utxos: {} })
+      sandbox
+        .stub(bchjs.Utxo.slp.Utils, 'hydrateUtxos')
+        .resolves(mockData.mockTwoHydratedAddrs)
+
+      const addr = [
+        'simpleledger:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvyucjzqt9',
+        'bitcoincash:qqh793x9au6ehvh7r2zflzguanlme760wuzehgzjh9'
+      ]
+
+      const result = await bchjs.Utxo.get(addr)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.isArray(result)
+      assert.equal(result.length, 2)
+      assert.property(result[0], 'address')
+      assert.property(result[0], 'bchUtxos')
+      assert.property(result[0], 'nullUtxos')
+      assert.property(result[0], 'slpUtxos')
+      assert.isArray(result[0].bchUtxos)
+      assert.isArray(result[0].nullUtxos)
+    })
+
+    it('should throw an error for array of 21 elements', async () => {
+      try {
+        const addr = 'simpleledger:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvyucjzqt9'
+
+        const addrs = []
+        for (let i = 0; i < 21; i++) {
+          addrs.push(addr)
+        }
+
+        await bchjs.Utxo.get(addrs)
+
+        assert.fail('Unexpected code path')
+      } catch (err) {
+        assert.include(err.message, 'Too many elements, 20 max.')
+      }
+    })
+
+    it('should handle NFTs and minting batons', async () => {
+      // Mock dependencies.
+      sandbox.stub(bchjs.Utxo.electrumx, 'utxo').resolves({ utxos: {} })
+      sandbox
+        .stub(bchjs.Utxo.slp.Utils, 'hydrateUtxos')
+        .resolves(mockData.mockEveryUtxoType)
+
+      const addr = 'simpleledger:qrm0c67wwqh0w7wjxua2gdt2xggnm90xwsr5k22euj'
+
+      const result = await bchjs.Utxo.get(addr)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.isArray(result)
+      assert.property(result[0], 'address')
+      assert.property(result[0], 'bchUtxos')
+      assert.property(result[0], 'nullUtxos')
+      assert.property(result[0], 'slpUtxos')
+      assert.isArray(result[0].bchUtxos)
+      assert.isArray(result[0].nullUtxos)
+
+      assert.isArray(result[0].slpUtxos.type1.mintBatons)
+      assert.isArray(result[0].slpUtxos.type1.tokens)
+      assert.isArray(result[0].slpUtxos.nft.groupMintBatons)
+      assert.isArray(result[0].slpUtxos.nft.groupTokens)
+      assert.isArray(result[0].slpUtxos.nft.tokens)
+    })
+
+    it('should use the whitelist when flag is set', async () => {
+      // Mock dependencies.
+      sandbox.stub(bchjs.Utxo.electrumx, 'utxo').resolves(mockData.mockUtxoData)
+      sandbox
+        .stub(bchjs.Utxo.slp.Utils, 'hydrateUtxosWL')
+        .resolves(mockData.mockHydratedUtxos)
+
+      const addr = 'simpleledger:qzv3zz2trz0xgp6a96lu4m6vp2nkwag0kvyucjzqt9'
+      const useWhitelist = true
+
+      const result = await bchjs.Utxo.get(addr, useWhitelist)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.isArray(result)
+      assert.property(result[0], 'address')
+      assert.property(result[0], 'bchUtxos')
+      assert.property(result[0], 'nullUtxos')
+      assert.property(result[0], 'slpUtxos')
+      assert.isArray(result[0].bchUtxos)
+      assert.isArray(result[0].nullUtxos)
+    })
+  })
+
+  describe('#findBiggestUtxo', () => {
+    it('should throw error for non-array input', async () => {
+      try {
+        await bchjs.Utxo.findBiggestUtxo({})
+
+        assert.equal(true, false, 'Unexpected result!')
+      } catch (err) {
+        assert.include(
+          err.message,
+          'utxos input to findBiggestUtxo() must be an array'
+        )
+      }
+    })
+
+    it('should throw an error if input does not have a value or satoshis property', async () => {
+      try {
+        const badUtxos = [
+          {
+            height: 0,
+            tx_hash:
+              '192f5037bb3822afd92d6b6ab51842a5dcfbe6bff783290057342da1f27ed414',
+            tx_pos: 0
+          }
+        ]
+
+        await bchjs.Utxo.findBiggestUtxo(badUtxos)
+      } catch (err) {
+        assert.include(
+          err.message,
+          'UTXOs require a satoshis or value property for findBiggestUtxo()'
+        )
+      }
+    })
+
+    it('should sort UTXOs from Electrumx', async () => {
+      const result = bchjs.Utxo.findBiggestUtxo(mockData.electrumxUtxos.utxos)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.property(result, 'satoshis')
+      assert.equal(result.satoshis, 800)
+    })
+  })
+})