diff --git a/src/routes/v3/blockbook.js b/src/routes/v3/blockbook.js
index e946718..7ae57f8 100644
--- a/src/routes/v3/blockbook.js
+++ b/src/routes/v3/blockbook.js
@@ -393,7 +393,7 @@ async function transactionsFromBlockbook(txid) {
 // GET handler for single transaction details.
 async function txSingle(req, res, next) {
   try {
-    const address = req.params.txid
+    const txid = req.params.txid
 
     if (!txid || txid === "") {
       res.status(400)
@@ -404,16 +404,22 @@ async function txSingle(req, res, next) {
     if (Array.isArray(txid)) {
       res.status(400)
       return res.json({
-        error: "address can not be an array. Use POST for bulk upload."
+        error: "txid can not be an array. Use POST for bulk upload."
+      })
+    }
+
+    // TODO: Add regex comparison of txid to ensure it's valid.
+    if (txid.length !== 64) {
+      res.status(400)
+      return res.json({
+        error: `txid must be of length 64 (not ${txid.length})`
       })
     }
 
     wlogger.debug(`Executing blockbook/txSingle with this txid: `, txid)
 
-    // TODO: Add regex comparison of txid to ensure it's valid.
-
     // Query the Blockbook Node API.
-    const retData = await transactionsFromBlockbook(address)
+    const retData = await transactionsFromBlockbook(txid)
 
     // Return the retrieved address information.
     res.status(200)
@@ -468,6 +474,12 @@ async function txBulk(req, res, next) {
       }
 
       // TODO: Add regex comparison of txid to ensure it's valid.
+      if (thisTxid.length !== 64) {
+        res.status(400)
+        return res.json({
+          error: `txid must be of length 64 (not ${thisTxid.length})`
+        })
+      }
     }
 
     // Loops through each address and creates an array of Promises, querying
diff --git a/test/v3/blockbook.js b/test/v3/blockbook.js
index 557fc35..a0d4cfe 100644
--- a/test/v3/blockbook.js
+++ b/test/v3/blockbook.js
@@ -37,10 +37,9 @@ describe("#Blockbook Router", () => {
       process.env.BLOCKBOOK_URL = "http://fakeurl/api/"
       mockServerUrl = `http://fakeurl`
     }
+    // console.log(`Testing type is: ${process.env.TEST}`)
 
     if (!process.env.NETWORK) process.env.NETWORK = "testnet"
-
-    // console.log(`Testing type is: ${process.env.TEST}`)
   })
 
   // Setup the mocks before each test.
@@ -589,4 +588,118 @@ describe("#Blockbook Router", () => {
       assert.equal(result.length, 2, "2 outputs for 2 inputs")
     })
   })
+
+  describe("#txSingle", () => {
+    // route handler
+    const txSingle = blockbookRoute.testableComponents.txSingle
+
+    it("should throw 400 if txid is empty", async () => {
+      const result = await txSingle(req, res)
+      //console.log(`result: ${util.inspect(result)}`)
+
+      assert.hasAllKeys(result, ["error"])
+      assert.include(result.error, "txid can not be empty")
+    })
+
+    it("should error on an array", async () => {
+      req.params.txid = [
+        `5fe9b74056319a8c87f45cc745030715a6180758b94938dbf90d639d55652392`
+      ]
+
+      const result = await txSingle(req, res)
+
+      assert.equal(res.statusCode, 400, "HTTP status code 400 expected.")
+      assert.include(
+        result.error,
+        "txid can not be an array",
+        "Proper error message"
+      )
+    })
+
+    it("should throw 400 if txid is not a valid txid", async () => {
+      req.params.txid = `abc`
+
+      const result = await txSingle(req, res)
+      //console.log(`result: ${util.inspect(result)}`)
+
+      assert.hasAllKeys(result, ["error"])
+      assert.include(result.error, "txid must be of length 64")
+    })
+
+    it("should throw 500 when network issues", async () => {
+      const savedUrl = process.env.BLOCKBOOK_URL
+
+      try {
+        req.params.txid = `5fe9b74056319a8c87f45cc745030715a6180758b94938dbf90d639d55652392`
+
+        // Switch the Insight URL to something that will error out.
+        process.env.BLOCKBOOK_URL = "http://fakeurl/api/"
+
+        const result = await txSingle(req, res)
+
+        // Restore the saved URL.
+        process.env.BLOCKBOOK_URL = savedUrl
+
+        assert.equal(res.statusCode, 500, "HTTP status code 500 expected.")
+        assert.include(result.error, "ENOTFOUND", "Error message expected")
+      } catch (err) {
+        // Restore the saved URL.
+        process.env.BLOCKBOOK_URL = savedUrl
+      }
+    })
+
+    it("should get tx details for a single txid", async () => {
+      req.params.txid = `5fe9b74056319a8c87f45cc745030715a6180758b94938dbf90d639d55652392`
+
+      // Mock the Insight URL for unit tests.
+      if (process.env.TEST === "unit") {
+        nock(`${process.env.BLOCKBOOK_URL}`)
+          .get(uri => uri.includes("/"))
+          .reply(200, mockData.mockTx)
+      }
+
+      // process.env.BLOCKBOOK_URL = `https://157.230.178.198:19131/`
+      // process.env.NODE_TLS_REJECT_UNAUTHORIZED = 0
+
+      // Call the details API.
+      const result = await txSingle(req, res)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.hasAnyKeys(result, [
+        "txid",
+        "version",
+        "vin",
+        "vout",
+        "blockHash",
+        "blockHeight",
+        "confirmations",
+        "blockTime",
+        "value",
+        "valueIn",
+        "fees",
+        "hex"
+      ])
+
+      // Vin
+      assert.isArray(result.vin)
+      assert.hasAnyKeys(result.vin[0], [
+        "txid",
+        "sequence",
+        "n",
+        "addresses",
+        "value",
+        "hex"
+      ])
+
+      // Vout
+      assert.isArray(result.vout)
+      assert.hasAnyKeys(result.vout[0], [
+        "value",
+        "n",
+        "spent",
+        "hex",
+        "addresses"
+      ])
+    })
+  })
 })
diff --git a/test/v3/mocks/blockbook-mock.js b/test/v3/mocks/blockbook-mock.js
index 1a3b89c..8246e80 100644
--- a/test/v3/mocks/blockbook-mock.js
+++ b/test/v3/mocks/blockbook-mock.js
@@ -28,7 +28,48 @@ const mockUtxos = [
   }
 ]
 
+const mockTx = {
+  txid: "5fe9b74056319a8c87f45cc745030715a6180758b94938dbf90d639d55652392",
+  version: 2,
+  vin: [
+    {
+      txid: "85ddb8215fc3701a493cf1c450644c5ef32c55aaa2f48ae2d008944394f3e4d3",
+      sequence: 4294967295,
+      n: 0,
+      addresses: ["bchtest:qqmd9unmhkpx4pkmr6fkrr8rm6y77vckjvqe8aey35"],
+      value: "16983000648",
+      hex:
+        "47304402202378e55f4d02bb932498deef22dfc1f7a4984858c3b55017e225dd567172252e0220373d27710b5d42a72ac9725959f1605a912fee0ae86a7ad36e7d6d796f14ca29412103c346eee77a77a8d3e073dacc0532ca7a5b9747bc06d88bf091cac9f4bc8bb792"
+    }
+  ],
+  vout: [
+    {
+      value: "16973000422",
+      n: 0,
+      spent: true,
+      hex: "76a91436d2f27bbd826a86db1e93618ce3de89ef33169388ac",
+      addresses: ["bchtest:qqmd9unmhkpx4pkmr6fkrr8rm6y77vckjvqe8aey35"]
+    },
+    {
+      value: "10000000",
+      n: 1,
+      hex: "76a9140e5b4ad9008bb9a027b7e2d0ef958914e12db20788ac",
+      addresses: ["bchtest:qq89kjkeqz9mngp8kl3dpmu43y2wztdjqu500gn4c4"]
+    }
+  ],
+  blockHash: "00000000005242edac4635ac2375a454e801cc1be8b131b622328089731e5e30",
+  blockHeight: 1265275,
+  confirmations: 65402,
+  blockTime: 1540912733,
+  value: "16983000422",
+  valueIn: "16983000648",
+  fees: "226",
+  hex:
+    "0200000001d3e4f394439408d0e28af4a2aa552cf35e4c6450c4f13c491a70c35f21b8dd85000000006a47304402202378e55f4d02bb932498deef22dfc1f7a4984858c3b55017e225dd567172252e0220373d27710b5d42a72ac9725959f1605a912fee0ae86a7ad36e7d6d796f14ca29412103c346eee77a77a8d3e073dacc0532ca7a5b9747bc06d88bf091cac9f4bc8bb792ffffffff02e66eabf3030000001976a91436d2f27bbd826a86db1e93618ce3de89ef33169388ac80969800000000001976a9140e5b4ad9008bb9a027b7e2d0ef958914e12db20788ac00000000"
+}
+
 module.exports = {
   mockBalance,
-  mockUtxos
+  mockUtxos,
+  mockTx
 }