Merge pull request #19 from Permissionless-Software-Foundation/ct-unstable

Updating README

.env-example

@@ -19,10 +19,13 @@ LOCAL_RESTURL=http://localhost:5942/v6
 
 # START ACCESS CONTROL
 
+PORT=5942
+
 # x402 payments required to access this API?
 X402_ENABLED=true
 SERVER_BCH_ADDRESS=bitcoincash:qqlrzp23w08434twmvr4fxw672whkjy0py26r63g3d
 FACILITATOR_URL=http://localhost:4345/facilitator
+X402_PRICE_SAT=200
 
 # Basic Authentication required to access this API?
 USE_BASIC_AUTH=true

README.md

@@ -1,30 +1,247 @@
 # psf-bch-api
 
-This is a REST API for communicating with Bitcoin Cash infrastructure. It replaces [bch-api](https://github.com/Permissionless-Software-Foundation/bch-api), and it implements [x402-bch protocol](https://github.com/x402-bch/x402-bch) to handle payments to access the API.
+[![License](https://img.shields.io/npm/l/@psf/bch-js)](https://github.com/Permissionless-Software-Foundation/psf-bch-api/blob/master/LICENSE.md)
+[![js-standard-style](https://img.shields.io/badge/javascript-standard%20code%20style-green.svg?style=flat-square)](https://github.com/feross/standard)
+
+This is a REST API server for communicating with Bitcoin Cash (BCH) blockchain infrastructure. It is written in node.js JavaScript using the [Express.js](https://expressjs.com/) framework and follows the [Clean Architecture](https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html) design pattern. It replaces the legacy [bch-api](https://github.com/Permissionless-Software-Foundation/bch-api) and implements the [x402-bch protocol](https://github.com/x402-bch/x402-bch) for optional per-call payments.
+
+psf-bch-api is the heart of the [Cash Stack](https://cashstack.info), a full software stack for building blockchain-based applications. It creates a single web2 REST API interface that abstracts away the complexity of the underlying blockchain infrastructure, so that application developers can interact with the blockchain through simple HTTP calls.
+
+![psf-bch-api software stack](./bch-api-dependency-graph.png)
+
+psf-bch-api depends on three pieces of back end infrastructure:
+
+- **[BCHN Full Node](https://cashstack.info/docs/back-end/bchn-full-node)** - the base blockchain node that validates transactions and blocks.
+- **[Fulcrum Indexer](https://cashstack.info/docs/back-end/fulcrum-indexer)** - an address indexer that tracks balances, transaction histories, and UTXOs.
+- **[SLP Token Indexer](https://cashstack.info/docs/back-end/slp-indexer/slp-indexer-software)** - tracks all SLP tokens on the blockchain.
+
+Front-end applications interact with psf-bch-api through libraries such as [bch-js](https://github.com/Permissionless-Software-Foundation/bch-js) or [bch-consumer](https://www.npmjs.com/package/bch-consumer).
+
+High-level documentation about the full Cash Stack is available at [CashStack.info](https://cashstack.info). Interactive API reference documentation is served by the running server at its root URL (e.g. `http://localhost:5942/`), and a live version can be found at [bch.fullstack.cash](https://bch.fullstack.cash/).
+
+## The .env File
+
+All runtime configuration is driven by a `.env` file in the project root. An example is provided at `.env-example`. To get started:
+
+`cp .env-example .env`
+
+Then edit `.env` to match your environment. The file is organized into two sections:
+
+### Infrastructure Setup
+
+These variables tell psf-bch-api where to find the back end services it depends on:
+
+- `RPC_BASEURL` - URL of the BCHN full node JSON-RPC interface. Default: `http://127.0.0.1:8332`
+- `RPC_USERNAME` - RPC username for the full node.
+- `RPC_PASSWORD` - RPC password for the full node.
+- `FULCRUM_API` - URL of the Fulcrum indexer REST API.
+- `SLP_INDEXER_API` - URL of the SLP Token Indexer REST API.
+- `LOCAL_RESTURL` - The REST API URL used internally for wallet operations. Default: `http://127.0.0.1:5942/v6/`
+
+### Access Control Settings
+
+These variables control who can access the API and how they pay for it. The three access-control use cases are described in detail in the [Access Control](#access-control) section below.
+
+- `PORT` - Port the server listens on. Default: `5942`
+- `X402_ENABLED` - Enable x402-bch per-call payment middleware. Default: `true`
+- `SERVER_BCH_ADDRESS` - BCH address that receives x402 payments. Default: `bitcoincash:qqsrke9lh257tqen99dkyy2emh4uty0vky9y0z0lsr`
+- `FACILITATOR_URL` - URL of the x402-bch facilitator service. Default: `http://localhost:4345/facilitator`
+- `X402_PRICE_SAT` - Price in satoshis charged per API call via x402. Default: `200`
+- `USE_BASIC_AUTH` - Enable Bearer token authentication middleware. Default: `false`
+- `BASIC_AUTH_TOKEN` - The expected Bearer token value.
+
+## Access Control
+
+psf-bch-api supports three major access-control configurations. Which one you choose depends on your deployment scenario. The behavior is controlled entirely by the `X402_ENABLED` and `USE_BASIC_AUTH` environment variables.
+
+### 1. No Rate Limits (Open Access)
+
+Set both access-control flags to `false`:
+
+```
+X402_ENABLED=false
+USE_BASIC_AUTH=false
+```
+
+All API endpoints are publicly accessible without any authentication or payment. This is the simplest configuration, ideal for **local development** or **private, trusted networks** where access control is handled at the network level (e.g. behind a firewall or VPN).
+
+### 2. Bearer Token Authentication
+
+Set `USE_BASIC_AUTH=true` and `X402_ENABLED=false`:
+
+```
+X402_ENABLED=false
+USE_BASIC_AUTH=true
+BASIC_AUTH_TOKEN=my-secret-token
+```
+
+Every API request (except `/health` and `/`) must include an `Authorization` header with a valid Bearer token:
+
+```
+Authorization: Bearer my-secret-token
+```
+
+Requests without a valid token receive an HTTP `401 Unauthorized` response. This is the best option when you want to **restrict access to a known set of users or services** (e.g. an organization's internal apps) without requiring cryptocurrency payments.
+
+### 3. x402-bch Per-Call Payments
+
+Set `X402_ENABLED=true`:
+
+```
+X402_ENABLED=true
+SERVER_BCH_ADDRESS=bitcoincash:qqlrzp23w08434twmvr4fxw672whkjy0py26r63g3d
+FACILITATOR_URL=http://localhost:4345/facilitator
+X402_PRICE_SAT=200
+```
+
+Every API call under the `/v6` prefix requires a BCH micro-payment. When a request arrives without a valid `X-PAYMENT` header, the server responds with HTTP `402 Payment Required` and includes the payment details. Client libraries that support the x402-bch protocol (like [bch-js](https://github.com/Permissionless-Software-Foundation/bch-js)) can handle payments automatically.
+
+This is the right choice for **public, monetized APIs** where you want to charge per call.
+
+#### Combined: x402 + Bearer Token
+
+You can enable both at the same time:
+
+```
+X402_ENABLED=true
+USE_BASIC_AUTH=true
+BASIC_AUTH_TOKEN=my-secret-token
+```
+
+In this mode, requests that present a valid Bearer token bypass the x402 payment requirement. All other requests must pay. This allows you to give **free access to trusted clients** (via the Bearer token) while still **monetizing public access** via x402.
+
+## Development
+
+This is a standard node.js project. To set up a development environment:
+
+1. Clone the repository:
+
+`git clone https://github.com/Permissionless-Software-Foundation/psf-bch-api && cd psf-bch-api`
+
+2. Install dependencies:
+
+`npm install`
+
+3. Create your configuration file:
+
+`cp .env-example .env`
+
+4. Edit `.env` to point to your back end infrastructure (full node, Fulcrum, SLP indexer). For local development you will likely want to disable access control:
+
+```
+X402_ENABLED=false
+USE_BASIC_AUTH=false
+```
+
+5. Start the server:
+
+`npm start`
+
+The server will start on port `5942` by default (or whatever you set in `PORT`). API documentation is available at `http://localhost:5942/`.
+
+### Generating API Docs
+
+The API reference documentation is generated by [apiDoc](https://apidocjs.com/) from inline annotations in the source code. To regenerate:
+
+`npm run docs`
+
+The output is written to the `docs/` directory and served by the running server at its root URL.
+
+A live version can be found at [bch.fullstack.cash](https://bch.fullstack.cash/).
+
+## Production (Docker)
+
+A Docker setup is provided in the `production/docker/` directory for production deployments. The target OS is Ubuntu Linux.
+
+1. Install [Docker and Docker Compose](https://docs.docker.com/engine/install/ubuntu/).
+
+2. Navigate to the Docker directory:
+
+`cd production/docker`
+
+3. Create and configure the `.env` file. An example is provided:
+
+`cp .env-example .env`
+
+Edit `.env` to match your production infrastructure. Note that inside a Docker container, `localhost` refers to the container itself. Use `172.17.0.1` (the default Docker bridge gateway) to reach services running on the host machine:
+
+```
+RPC_BASEURL=http://172.17.0.1:8332
+FULCRUM_API=http://172.17.0.1:3001/v1
+SLP_INDEXER_API=http://172.17.0.1:5010
+```
+
+4. Build the Docker image:
+
+`docker-compose build --no-cache`
+
+5. Start the container:
+
+`docker-compose up -d`
+
+The container maps host port `5942` to container port `5942`. The `.env` file is mounted into the container as a volume, so you can update configuration without rebuilding.
+
+To view logs:
+
+`docker logs -f psf-bch-api`
+
+To stop the container:
+
+`docker-compose down`
+
+A helper script `cleanup-images.sh` is provided to remove dangling Docker images after rebuilds.
+
+## Testing
+
+The project includes both unit tests and integration tests. Tests use [Mocha](https://mochajs.org/) as the test runner, [Chai](https://www.chaijs.com/) for assertions, and [Sinon](https://sinonjs.org/) for mocking. Code coverage is provided by [c8](https://github.com/bcoe/c8).
+
+### Unit Tests
+
+Unit tests are located in `test/unit/` and cover adapters, controllers, and use cases. They do not require any running infrastructure. To run:
+
+`npm test`
+
+This will first lint the code with [Standard](https://standardjs.com/), then execute all unit tests with code coverage.
+
+To generate an HTML coverage report:
+
+`npm run coverage`
+
+The report is written to the `coverage/` directory.
+
+### Integration Tests
+
+Integration tests are located in `test/integration/` and require the back end infrastructure (full node, Fulcrum, SLP indexer) to be running. To run:
+
+`npm run test:integration`
+
+Integration tests have a 25-second timeout per test to accommodate network calls.
+
+## Configuration Reference
+
+All configuration values are read from environment variables (via the `.env` file). The complete list:
+
+- `PORT` - Server listen port. Default: `5942`
+- `NODE_ENV` - Environment (`development` or `production`). Default: `development`
+- `API_PREFIX` - URL prefix for all REST endpoints. Default: `/v6`
+- `LOG_LEVEL` - Winston logging level. Default: `info`
+- `RPC_BASEURL` - Full node JSON-RPC URL. Default: `http://127.0.0.1:8332`
+- `RPC_USERNAME` - Full node RPC username.
+- `RPC_PASSWORD` - Full node RPC password.
+- `RPC_TIMEOUT_MS` - Full node RPC request timeout in ms. Default: `15000`
+- `FULCRUM_API` - Fulcrum indexer REST API URL.
+- `FULCRUM_TIMEOUT_MS` - Fulcrum API request timeout in ms. Default: `15000`
+- `SLP_INDEXER_API` - SLP Token Indexer REST API URL.
+- `SLP_INDEXER_TIMEOUT_MS` - SLP Indexer API request timeout in ms. Default: `15000`
+- `LOCAL_RESTURL` - Internal REST URL for wallet operations. Default: `http://127.0.0.1:5942/v6/`
+- `IPFS_GATEWAY` - IPFS gateway hostname. Default: `p2wdb-gateway-678.fullstack.cash`
+- `X402_ENABLED` - Enable x402-bch payment middleware. Default: `true`
+- `SERVER_BCH_ADDRESS` - BCH address for x402 payments. Default: `bitcoincash:qqsrke9lh257tqen99dkyy2emh4uty0vky9y0z0lsr`
+- `FACILITATOR_URL` - x402-bch facilitator service URL. Default: `http://localhost:4345/facilitator`
+- `X402_PRICE_SAT` - Satoshis charged per API call via x402. Default: `200`
+- `USE_BASIC_AUTH` - Enable Bearer token authentication. Default: `false`
+- `BASIC_AUTH_TOKEN` - Expected Bearer token value.
 
 ## License
 
 [MIT](./LICENSE.md)
-
-## x402-bch Payments
-
-All REST endpoints exposed under the `/v6` prefix are protected by the [`x402-bch-express`](https://www.npmjs.com/package/x402-bch-express) middleware. Each API call requires a BCH payment authorization for **2000 satoshis**. The middleware advertises payment requirements via HTTP 402 responses and validates incoming `X-PAYMENT` headers with a configured Facilitator.
-
-### Configuration
-
-Environment variables control the payment flow:
-
-- `X402_ENABLED` — set to `false` (case-insensitive) to disable the middleware. Defaults to enabled.
-- `SERVER_BCH_ADDRESS` — BCH cash address that receives funding transactions. Defaults to `bitcoincash:qqlrzp23w08434twmvr4fxw672whkjy0py26r63g3d`.
-- `FACILITATOR_URL` — Root URL of the facilitator service (e.g., `http://localhost:4345/facilitator`).
-- `X402_PRICE_SAT` — Optional; override the satoshi price per call (defaults to `2000`).
-
-When `X402_ENABLED=false`, the server continues to operate without payment headers for local development or trusted deployments.
-
-### Manual Verification
-
-1. Start or point to an `x402-bch` facilitator service (the example facilitator listens at `http://localhost:4345/facilitator`).
-2. Run the API server with the default configuration: `npm start`.
-3. Call a protected endpoint without an `X-PAYMENT` header, e.g. `curl -i http://localhost:5942/v6/full-node/control/getNetworkInfo`. The server will respond with HTTP `402` and include payment requirements.
-4. Restart the server with `X402_ENABLED=false npm start` to confirm that the same request now bypasses the middleware (useful for local development without payments).
-

bin/server.js

@@ -74,6 +74,19 @@ class Server {
         allowedHeaders: ['Content-Type', 'Authorization', 'X-Requested-With']
       }))
 
+      // URL normalization middleware - collapse multiple slashes
+      app.use((req, res, next) => {
+        if (req.url && req.url.includes('//')) {
+          // Split URL into path and query string
+          const [path, queryString] = req.url.split('?')
+          // Collapse multiple consecutive slashes into a single slash
+          const normalizedPath = path.replace(/\/+/g, '/')
+          // Reconstruct req.url with normalized path (req.path is read-only and will auto-update)
+          req.url = queryString ? `${normalizedPath}?${queryString}` : normalizedPath
+        }
+        next()
+      })
+
       // Apply basic auth middleware if enabled
       // This must run before x402 middleware to set req.locals.basicAuthValid
       if (basicAuthSettings.enabled) {
@@ -83,8 +96,10 @@ class Server {
 
       // Apply x402 middleware based on configuration
       // Logic:
-      // - If X402_ENABLED=false OR USE_BASIC_AUTH=false: Don't apply x402 (no rate limits)
       // - If X402_ENABLED=true AND USE_BASIC_AUTH=true: Apply x402 conditionally (bypass if basic auth valid)
+      // - If X402_ENABLED=true AND USE_BASIC_AUTH=false: Apply x402 unconditionally (no basic auth bypass)
+      // - If X402_ENABLED=false AND USE_BASIC_AUTH=true: Require basic auth only
+      // - If X402_ENABLED=false AND USE_BASIC_AUTH=false: No access control
 
       // Apply access control middleware based on configuration
       if (x402Settings.enabled && basicAuthSettings.enabled) {
@@ -112,6 +127,21 @@ class Server {
         }
 
         app.use(conditionalX402Middleware)
+      } else if (x402Settings.enabled && !basicAuthSettings.enabled) {
+        // X402_ENABLED=true AND USE_BASIC_AUTH=false: Apply x402 unconditionally (no basic auth bypass)
+        const routes = buildX402Routes(this.config.apiPrefix)
+        const facilitatorOptions = x402Settings.facilitatorUrl
+          ? { url: x402Settings.facilitatorUrl }
+          : undefined
+
+        wlogger.info(`x402 middleware enabled (basic auth disabled); enforcing ${x402Settings.priceSat} satoshis per request`)
+
+        // Apply x402 middleware unconditionally - no basic auth bypass
+        app.use(x402PaymentMiddleware(
+          x402Settings.serverAddress,
+          routes,
+          facilitatorOptions
+        ))
       } else if (basicAuthSettings.enabled && !x402Settings.enabled) {
         // USE_BASIC_AUTH=true AND X402_ENABLED=false: Require basic auth, reject unauthenticated requests
         wlogger.info('Basic auth enforcement enabled (x402 disabled)')
@@ -144,7 +174,7 @@ class Server {
 
       // Endpoint logging middleware
       app.use((req, res, next) => {
-        console.log(`Endpoint called: ${req.method} ${req.path}`)
+        console.log(`Endpoint called: ${req.method} ${req.path} by ${req.ip}`)
         res.on('finish', () => {
           console.log(`Endpoint responded: ${req.method} ${req.path} - ${res.statusCode}`)
         })

package.json

@@ -15,17 +15,17 @@
   "license": "MIT",
   "description": "REST API proxy to Bitcoin Cash infrastructure",
   "dependencies": {
-    "@psf/bch-js": "6.8.3",
+    "@psf/bch-js": "7.1.11",
     "axios": "1.7.7",
     "cors": "2.8.5",
     "dotenv": "16.3.1",
     "express": "5.1.0",
-    "minimal-slp-wallet": "5.13.3",
-    "psffpp": "1.2.0",
+    "minimal-slp-wallet": "7.1.4",
+    "psffpp": "1.2.1",
     "slp-token-media": "1.2.10",
     "winston": "3.11.0",
     "winston-daily-rotate-file": "4.7.1",
-    "x402-bch-express": "1.1.1"
+    "x402-bch-express": "2.0.0"
   },
   "devDependencies": {
     "apidoc": "1.2.0",

production/docker/.env-example

@@ -0,0 +1,37 @@
+# START INFRASTRUCTURE SETUP
+
+# Full Node Connection
+RPC_BASEURL=http://172.17.0.1:8332
+RPC_USERNAME=bitcoin
+RPC_PASSWORD=password
+
+# Fulcrum Indexer
+FULCRUM_API=http://172.17.0.1:3001/v1
+
+# SLP Indexer
+SLP_INDEXER_API=http://172.17.0.1:5010
+
+# REST API URL for wallet operations
+LOCAL_RESTURL=http://172.17.0.1:5942/v6
+
+# END INFRASTRUCTURE SETUP
+
+
+# START ACCESS CONTROL
+
+PORT=5942
+
+# x402 payments required to access this API?
+X402_ENABLED=false
+#X402_ENABLED=true
+#SERVER_BCH_ADDRESS=bitcoincash:qqlrzp23w08434twmvr4fxw672whkjy0py26r63g3d
+#FACILITATOR_URL=http://localhost:4345/facilitator
+#X402_PRICE_SAT=200
+
+# Basic Authentication required to access this API?
+USE_BASIC_AUTH=false
+#USE_BASIC_AUTH=true
+#BASIC_AUTH_TOKEN=some-random-token
+
+# END ACCESS CONTROL
+

production/docker/Dockerfile

@@ -2,8 +2,6 @@
 #
 
 #IMAGE BUILD COMMANDS
-# ct-base-ubuntu = ubuntu 18.04 + nodejs v10 LTS
-#FROM christroutner/ct-base-ubuntu
 FROM ubuntu:22.04
 MAINTAINER Chris Troutner <chris.troutner@gmail.com>
 
@@ -47,39 +45,26 @@ RUN runuser -l safeuser -c "npm config set prefix '~/.npm-global'"
 
 # Clone the rest.bitcoin.com repository
 WORKDIR /home/safeuser
-RUN git clone https://github.com/christroutner/REST2NOSTR
+RUN git clone https://github.com/Permissionless-Software-Foundation/psf-bch-api
 
 # Switch to the desired branch. `master` is usually stable,
 # and `stage` has the most up-to-date changes.
-WORKDIR /home/safeuser/REST2NOSTR
+WORKDIR /home/safeuser/psf-bch-api
 
-# For development: switch to unstable branch
-#RUN git checkout pin-ipfs
+RUN git checkout ct-unstable
 
 # Install dependencies
 RUN npm install
+RUN npm install minimal-slp-wallet
 
 # Generate the API docs
 RUN npm run docs
 
-#VOLUME /home/safeuser/keys
+COPY .env .env
 
-# Make leveldb folders
-#RUN mkdir leveldb
-#WORKDIR /home/safeuser/psf-slp-indexer/leveldb
-#RUN mkdir current
-#RUN mkdir zips
-#RUN mkdir backup
-#WORKDIR /home/safeuser/psf-slp-indexer/leveldb/zips
-#COPY restore-auto.sh restore-auto.sh
-#WORKDIR /home/safeuser/psf-slp-indexer
 
-# Expose the port the API will be served on.
-#EXPOSE 5011
+CMD ["npm", "start"]
 
-# Start the application.
-#COPY start-production.sh start-production.sh
-VOLUME start-rest2nostr.sh
-CMD ["./start-rest2nostr.sh"]
-
-#CMD ["npm", "start"]
+# Used to debug the container.
+#COPY temp.js temp.js
+#CMD ["node", "temp.js"]

production/docker/docker-compose.yml

@@ -1,9 +1,9 @@
 # Start the service with the command 'docker-compose up -d'
 
 services:
-    rest2nostr:
+    psf-bch-api:
       build: .
-      container_name: rest2nostr
+      container_name: psf-bch-api
       logging:
         driver: 'json-file'
         options:
@@ -15,5 +15,6 @@ services:
       ports:
         - '5942:5942' # <host port>:<container port>
       volumes:
-        - ./start-rest2nostr.sh:/home/safeuser/REST2NOSTR/start-rest2nostr.sh
+        #- ./start-rest2nostr.sh:/home/safeuser/REST2NOSTR/start-rest2nostr.sh
+        - ./.env:/home/safeuser/.env
       restart: always

production/docker/start-rest2nostr.sh

@@ -1,3 +0,0 @@
-#!/bin/bash
-
-npm start

src/config/env/common.js

@@ -26,10 +26,10 @@ const normalizeBoolean = (value, defaultValue) => {
   return defaultValue
 }
 
-// By default, the price per API call is 2000 satoshis.
+// By default, the price per API call is 200 satoshis.
 // But the user can override this value by setting the X402_PRICE_SAT environment variable.
 const parsedPriceSat = Number(process.env.X402_PRICE_SAT)
-const priceSat = Number.isFinite(parsedPriceSat) && parsedPriceSat > 0 ? parsedPriceSat : 2000
+const priceSat = Number.isFinite(parsedPriceSat) && parsedPriceSat > 0 ? parsedPriceSat : 200
 
 const x402Defaults = {
   enabled: normalizeBoolean(process.env.X402_ENABLED, true),
@@ -45,7 +45,7 @@ const basicAuthDefaults = {
 
 export default {
   // Server port
-  port: process.env.PORT || 5942,
+  port: parseInt(process.env.PORT, 10) || 5942,
 
   // Environment
   env: process.env.NODE_ENV || 'development',

src/config/x402.js

@@ -26,7 +26,7 @@ export function buildX402Routes (apiPrefix = '/v6') {
       price: config.x402.priceSat,
       network: NETWORK,
       config: {
-        description: `${DEFAULT_DESCRIPTION} (2000 satoshis)`,
+        description: `${DEFAULT_DESCRIPTION} (${config.x402.priceSat} satoshis)`,
         maxTimeoutSeconds: DEFAULT_TIMEOUT_SECONDS
       }
     }

src/controllers/rest-api/encryption/controller.js

@@ -0,0 +1,100 @@
+/*
+  REST API Controller for the /encryption routes.
+*/
+
+import wlogger from '../../../adapters/wlogger.js'
+
+class EncryptionRESTController {
+  constructor (localConfig = {}) {
+    this.adapters = localConfig.adapters
+    if (!this.adapters) {
+      throw new Error(
+        'Instance of Adapters library required when instantiating Encryption REST Controller.'
+      )
+    }
+
+    this.useCases = localConfig.useCases
+    if (!this.useCases || !this.useCases.encryption) {
+      throw new Error(
+        'Instance of Encryption use cases required when instantiating Encryption REST Controller.'
+      )
+    }
+
+    this.encryptionUseCases = this.useCases.encryption
+
+    // Bind functions
+    this.root = this.root.bind(this)
+    this.getPublicKey = this.getPublicKey.bind(this)
+    this.handleError = this.handleError.bind(this)
+  }
+
+  /**
+   * @api {get} /v6/encryption/ Service status
+   * @apiName EncryptionRoot
+   * @apiGroup Encryption
+   *
+   * @apiDescription Returns the status of the encryption service.
+   *
+   * @apiSuccess {String} status Service identifier
+   */
+  async root (req, res) {
+    return res.status(200).json({ status: 'encryption' })
+  }
+
+  /**
+   * @api {get} /v6/encryption/publickey/:address Get public key for a BCH address
+   * @apiName GetPublicKey
+   * @apiGroup Encryption
+   * @apiDescription Searches the blockchain for a public key associated with a
+   * BCH address. Returns an object. If successful, the publicKey property will
+   * contain a hexadecimal representation of the public key.
+   *
+   * @apiParam {String} address BCH address (cash address or legacy format)
+   *
+   * @apiExample Example usage:
+   * curl -X GET "https://api.fullstack.cash/v6/encryption/publickey/bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf" -H "accept: application/json"
+   *
+   * @apiSuccess {Boolean} success Indicates if the operation was successful
+   * @apiSuccess {String} publicKey The public key in hexadecimal format, or "not found"
+   */
+  async getPublicKey (req, res) {
+    try {
+      const address = req.params.address
+
+      // Reject if address is an array
+      if (Array.isArray(address)) {
+        res.status(400)
+        return res.json({
+          success: false,
+          error: 'address can not be an array.'
+        })
+      }
+
+      // Reject if address is missing
+      if (!address) {
+        res.status(400)
+        return res.json({
+          success: false,
+          error: 'address is required.'
+        })
+      }
+
+      const result = await this.encryptionUseCases.getPublicKey({ address })
+
+      return res.status(200).json(result)
+    } catch (err) {
+      return this.handleError(err, res)
+    }
+  }
+
+  handleError (err, res) {
+    wlogger.error('Error in EncryptionRESTController:', err)
+
+    const status = err.status || 500
+    const message = err.message || 'Internal server error'
+
+    return res.status(status).json({ success: false, error: message })
+  }
+}
+
+export default EncryptionRESTController

src/controllers/rest-api/encryption/router.js

@@ -0,0 +1,51 @@
+/*
+  REST API router for /encryption routes.
+*/
+
+import express from 'express'
+import EncryptionRESTController from './controller.js'
+
+class EncryptionRouter {
+  constructor (localConfig = {}) {
+    this.adapters = localConfig.adapters
+    if (!this.adapters) {
+      throw new Error(
+        'Instance of Adapters library required when instantiating Encryption REST Router.'
+      )
+    }
+
+    this.useCases = localConfig.useCases
+    if (!this.useCases) {
+      throw new Error(
+        'Instance of Use Cases library required when instantiating Encryption REST Router.'
+      )
+    }
+
+    const dependencies = {
+      adapters: this.adapters,
+      useCases: this.useCases
+    }
+
+    this.encryptionController = new EncryptionRESTController(dependencies)
+
+    this.apiPrefix = (localConfig.apiPrefix || '').replace(/\/$/, '')
+    this.baseUrl = `${this.apiPrefix}/encryption`
+    if (!this.baseUrl.startsWith('/')) {
+      this.baseUrl = `/${this.baseUrl}`
+    }
+    this.router = express.Router()
+  }
+
+  attach (app) {
+    if (!app) {
+      throw new Error('Must pass app object when attaching REST API controllers.')
+    }
+
+    this.router.get('/', this.encryptionController.root)
+    this.router.get('/publickey/:address', this.encryptionController.getPublicKey)
+
+    app.use(this.baseUrl, this.router)
+  }
+}
+
+export default EncryptionRouter

src/controllers/rest-api/fulcrum/controller.js

@@ -4,8 +4,9 @@
 
 import wlogger from '../../../adapters/wlogger.js'
 import BCHJS from '@psf/bch-js'
+import config from '../../../config/index.js'
 
-const bchjs = new BCHJS()
+const bchjs = new BCHJS({ restURL: config.restURL })
 
 class FulcrumRESTController {
   constructor (localConfig = {}) {
@@ -423,7 +424,20 @@ class FulcrumRESTController {
 
       const cashAddr = this._validateAndConvertAddress(address)
 
-      const result = await this.fulcrumUseCases.getTransactions({ address: cashAddr, allTxs })
+      // Extract bearer token from request header if present
+      let bearerToken = null
+      if (req.headers && req.headers.authorization) {
+        const parts = req.headers.authorization.split(' ')
+        if (parts.length === 2 && parts[0] === 'Bearer') {
+          bearerToken = parts[1]
+        }
+      }
+
+      const result = await this.fulcrumUseCases.getTransactions({
+        address: cashAddr,
+        allTxs,
+        bearerToken
+      })
       return res.status(200).json(result)
     } catch (err) {
       return this.handleError(err, res)
@@ -469,9 +483,19 @@ class FulcrumRESTController {
         }
       }
 
+      // Extract bearer token from request header if present
+      let bearerToken = null
+      if (req.headers && req.headers.authorization) {
+        const parts = req.headers.authorization.split(' ')
+        if (parts.length === 2 && parts[0] === 'Bearer') {
+          bearerToken = parts[1]
+        }
+      }
+
       const result = await this.fulcrumUseCases.getTransactionsBulk({
         addresses: validatedAddresses,
-        allTxs
+        allTxs,
+        bearerToken
       })
       return res.status(200).json(result)
     } catch (err) {

src/controllers/rest-api/index.js

@@ -10,6 +10,7 @@
 import BlockchainRouter from './full-node/blockchain/router.js'
 import ControlRouter from './full-node/control/router.js'
 import DSProofRouter from './full-node/dsproof/router.js'
+import EncryptionRouter from './encryption/router.js'
 import FulcrumRouter from './fulcrum/router.js'
 import MiningRouter from './full-node/mining/router.js'
 import PriceRouter from './price/router.js'
@@ -70,6 +71,9 @@ class RESTControllers {
     const dsproofRouter = new DSProofRouter(dependencies)
     dsproofRouter.attach(app)
 
+    const encryptionRouter = new EncryptionRouter(dependencies)
+    encryptionRouter.attach(app)
+
     const fulcrumRouter = new FulcrumRouter(dependencies)
     fulcrumRouter.attach(app)
 

src/controllers/rest-api/slp/controller.js

@@ -4,8 +4,9 @@
 
 import wlogger from '../../../adapters/wlogger.js'
 import BCHJS from '@psf/bch-js'
+import config from '../../../config/index.js'
 
-const bchjs = new BCHJS()
+const bchjs = new BCHJS({ restURL: config.restURL })
 
 class SlpRESTController {
   constructor (localConfig = {}) {
@@ -201,6 +202,7 @@ class SlpRESTController {
       const result = await this.slpUseCases.getTokenData({ tokenId, withTxHistory })
       return res.status(200).json(result)
     } catch (err) {
+      console.log('Error in /v6/slp/token/data getTokenData(): ', err)
       return this.handleError(err, res)
     }
   }

src/use-cases/encryption-use-cases.js

@@ -0,0 +1,120 @@
+/*
+  Use cases for encryption-related operations.
+  Retrieves public keys from the blockchain for BCH addresses.
+*/
+
+// Global npm libraries
+import BCHJS from '@psf/bch-js'
+
+// Local libraries
+import wlogger from '../adapters/wlogger.js'
+import config from '../config/index.js'
+
+const bchjs = new BCHJS({ restURL: config.restURL })
+
+class EncryptionUseCases {
+  constructor (localConfig = {}) {
+    this.adapters = localConfig.adapters
+    if (!this.adapters) {
+      throw new Error('Adapters instance required when instantiating Encryption use cases.')
+    }
+
+    this.useCases = localConfig.useCases
+    if (!this.useCases) {
+      throw new Error('UseCases instance required when instantiating Encryption use cases.')
+    }
+
+    // Allow bchjs to be injected for testing
+    this.bchjs = localConfig.bchjs || bchjs
+  }
+
+  /**
+   * Get the public key for a BCH address by searching the blockchain.
+   * Searches the transaction history of the address for a transaction input
+   * that contains the public key.
+   *
+   * @param {Object} params - Parameters object
+   * @param {string} params.address - BCH address (cash address or legacy format)
+   * @returns {Promise<Object>} Object with success status and publicKey if found
+   */
+  async getPublicKey ({ address }) {
+    try {
+      // Convert to cash address format
+      const cashAddr = this.bchjs.Address.toCashAddress(address)
+
+      // Get transaction history for the address
+      const txHistory = await this.useCases.fulcrum.getTransactions({ address: cashAddr })
+
+      // Extract just the TXIDs
+      const txids = txHistory.transactions.map((elem) => elem.tx_hash)
+
+      // Throw error if there is no transaction history
+      if (!txids || txids.length === 0) {
+        throw new Error('No transaction history.')
+      }
+
+      // Loop through the transaction history and search for the public key
+      for (let i = 0; i < txids.length; i++) {
+        const thisTx = txids[i]
+
+        // Get verbose transaction details
+        const txDetails = await this.useCases.rawtransactions.getRawTransaction({
+          txid: thisTx,
+          verbose: true
+        })
+
+        const vin = txDetails.vin
+
+        // Loop through each input
+        for (let j = 0; j < vin.length; j++) {
+          const thisVin = vin[j]
+
+          // Skip if no scriptSig (e.g., coinbase transactions)
+          if (!thisVin.scriptSig || !thisVin.scriptSig.asm) {
+            continue
+          }
+
+          // Extract the script signature
+          const scriptSig = thisVin.scriptSig.asm.split(' ')
+
+          // Extract the public key from the script signature (last element)
+          const pubKey = scriptSig[scriptSig.length - 1]
+
+          // Skip if pubKey is not a valid hex string (basic validation)
+          if (!pubKey || !/^[0-9a-fA-F]+$/.test(pubKey)) {
+            continue
+          }
+
+          try {
+            // Generate cash address from public key
+            const keyBuf = Buffer.from(pubKey, 'hex')
+            const ec = this.bchjs.ECPair.fromPublicKey(keyBuf)
+            const cashAddr2 = this.bchjs.ECPair.toCashAddress(ec)
+
+            // If public keys match, this is the correct public key
+            if (cashAddr === cashAddr2) {
+              return {
+                success: true,
+                publicKey: pubKey
+              }
+            }
+          } catch (err) {
+            // Skip invalid public keys - continue searching
+            continue
+          }
+        }
+      }
+
+      // Public key not found in any transaction
+      return {
+        success: false,
+        publicKey: 'not found'
+      }
+    } catch (err) {
+      wlogger.error('Error in EncryptionUseCases.getPublicKey()', err)
+      throw err
+    }
+  }
+}
+
+export default EncryptionUseCases

src/use-cases/fulcrum-use-cases.js

@@ -4,8 +4,17 @@
 
 import wlogger from '../adapters/wlogger.js'
 import BCHJS from '@psf/bch-js'
+import config from '../config/index.js'
 
-const bchjs = new BCHJS()
+// Use RESTURL (from test) or REST_URL (from psf-bch-api config) or fallback to config
+const restURL = process.env.RESTURL || process.env.REST_URL || process.env.LOCAL_RESTURL || config.restURL
+// Use BCHJSBEARERTOKEN (from test) or BASIC_AUTH_TOKEN (from psf-bch-api config) or fallback to config
+const bearerToken = process.env.BCHJSBEARERTOKEN || process.env.BASIC_AUTH_TOKEN || config.basicAuth.token
+
+const bchjs = new BCHJS({
+  restURL,
+  bearerToken
+})
 
 class FulcrumUseCases {
   constructor (localConfig = {}) {
@@ -53,7 +62,14 @@ class FulcrumUseCases {
   }
 
   async getTransactionDetails ({ txid }) {
-    return this.fulcrum.get(`electrumx/tx/data/${txid}`)
+    try {
+      const response = await this.fulcrum.get(`electrumx/tx/data/${txid}`)
+      // console.log(`getTransactionDetails() TXID ${txid}: ${JSON.stringify(response, null, 2)}`)
+      return response
+    } catch (err) {
+      wlogger.error('Error in FulcrumUseCases.getTransactionDetails()', err)
+      throw err
+    }
   }
 
   async getTransactionDetailsBulk ({ txids, verbose }) {
@@ -90,13 +106,24 @@ class FulcrumUseCases {
     }
   }
 
-  async getTransactions ({ address, allTxs }) {
+  async getTransactions ({ address, allTxs, bearerToken = null }) {
     try {
       const response = await this.fulcrum.get(`electrumx/transactions/${address}`)
 
       // Sort transactions in descending order, so that newest transactions are first.
       if (response.transactions && Array.isArray(response.transactions)) {
-        response.transactions = await this.bchjs.Electrumx.sortAllTxs(response.transactions, 'DESCENDING')
+        // Use bearer token from request if provided, otherwise use the default bchjs instance
+        let bchjsInstance = this.bchjs
+        if (bearerToken) {
+          // Create a temporary bchjs instance with the bearer token from the request
+          const restURL = process.env.RESTURL || process.env.REST_URL || process.env.LOCAL_RESTURL || config.restURL
+          bchjsInstance = new BCHJS({
+            restURL,
+            bearerToken
+          })
+        }
+
+        response.transactions = await bchjsInstance.Electrumx.sortAllTxs(response.transactions, 'DESCENDING')
 
         if (!allTxs) {
           // Return only the first 100 transactions of the history.
@@ -111,16 +138,31 @@ class FulcrumUseCases {
     }
   }
 
-  async getTransactionsBulk ({ addresses, allTxs }) {
+  async getTransactionsBulk ({ addresses, allTxs, bearerToken = null }) {
     try {
       const response = await this.fulcrum.post('electrumx/transactions/', { addresses })
 
       // Sort transactions in descending order for each address entry.
       if (response.transactions && Array.isArray(response.transactions)) {
+        // Use bearer token from request if provided, otherwise use the default bchjs instance
+        let bchjsInstance = this.bchjs
+        
+        // console.log('getTransactionsBulk() bearerToken: ', bearerToken)
+        if (bearerToken) {
+          // Create a temporary bchjs instance with the bearer token from the request
+          const restURL = config.restURL
+
+          // console.log('getTransactionsBulk() restURL: ', restURL)
+          bchjsInstance = new BCHJS({
+            restURL,
+            bearerToken
+          })
+        }
+
         for (let i = 0; i < response.transactions.length; i++) {
           const thisEntry = response.transactions[i]
           if (thisEntry.transactions && Array.isArray(thisEntry.transactions)) {
-            thisEntry.transactions = await this.bchjs.Electrumx.sortAllTxs(thisEntry.transactions, 'DESCENDING')
+            thisEntry.transactions = await bchjsInstance.Electrumx.sortAllTxs(thisEntry.transactions, 'DESCENDING')
 
             if (!allTxs && thisEntry.transactions.length > 100) {
               // Extract only the first 100 transactions.

src/use-cases/index.js

@@ -8,6 +8,7 @@
 import BlockchainUseCases from './full-node-blockchain-use-cases.js'
 import ControlUseCases from './full-node-control-use-cases.js'
 import DSProofUseCases from './full-node-dsproof-use-cases.js'
+import EncryptionUseCases from './encryption-use-cases.js'
 import FulcrumUseCases from './fulcrum-use-cases.js'
 import MiningUseCases from './full-node-mining-use-cases.js'
 import PriceUseCases from './price-use-cases.js'
@@ -31,6 +32,12 @@ class UseCases {
     this.price = new PriceUseCases({ adapters: this.adapters })
     this.rawtransactions = new RawTransactionsUseCases({ adapters: this.adapters })
     this.slp = new SlpUseCases({ adapters: this.adapters })
+
+    // Encryption use cases require access to other use cases (fulcrum, rawtransactions)
+    this.encryption = new EncryptionUseCases({
+      adapters: this.adapters,
+      useCases: this
+    })
   }
 
   // Run any startup Use Cases at the start of the app.

src/use-cases/slp-use-cases.js

@@ -9,7 +9,7 @@ import SlpTokenMedia from 'slp-token-media'
 import axios from 'axios'
 import config from '../config/index.js'
 
-const bchjs = new BCHJS()
+const bchjs = new BCHJS({ restURL: config.restURL })
 
 class SlpUseCases {
   constructor (localConfig = {}) {
@@ -259,6 +259,7 @@ class SlpUseCases {
 
       return mutableCid
     } catch (err) {
+      console.log('Error in SlpUseCases.getMutableCid()', err)
       wlogger.error('Error in SlpUseCases.getMutableCid()', err)
       return false
     }
@@ -271,7 +272,9 @@ class SlpUseCases {
       }
 
       // Get transaction data
+      console.log('Decoding OP_RETURN for TXID: ', txid)
       const txData = await this.bchjs.Electrumx.txData(txid)
+      // console.log(`TXID ${txid}: ${JSON.stringify(txData, null, 2)}`)
       let data = false
 
       // Map the vout of the transaction in search of an OP_RETURN
@@ -291,6 +294,7 @@ class SlpUseCases {
 
       return data
     } catch (error) {
+      console.log('Error in SlpUseCases.decodeOpReturn()', error)
       wlogger.error('Error in SlpUseCases.decodeOpReturn()', error)
       throw error
     }

test/unit/controllers/encryption-controller-unit.js

@@ -0,0 +1,203 @@
+/*
+  Unit tests for EncryptionRESTController.
+*/
+
+import { assert } from 'chai'
+import sinon from 'sinon'
+
+import EncryptionRESTController from '../../../src/controllers/rest-api/encryption/controller.js'
+import { createMockRequest, createMockResponse, createMockRequestWithParams } from '../mocks/controller-mocks.js'
+
+describe('#encryption-controller.js', () => {
+  let sandbox
+  let mockAdapters
+  let mockUseCases
+  let uut
+
+  beforeEach(() => {
+    sandbox = sinon.createSandbox()
+    mockAdapters = {}
+    mockUseCases = {
+      encryption: {
+        getPublicKey: sandbox.stub().resolves({
+          success: true,
+          publicKey: '02abc123def456789'
+        })
+      }
+    }
+
+    uut = new EncryptionRESTController({
+      adapters: mockAdapters,
+      useCases: mockUseCases
+    })
+  })
+
+  afterEach(() => {
+    sandbox.restore()
+  })
+
+  describe('#constructor()', () => {
+    it('should require adapters', () => {
+      assert.throws(() => {
+        // eslint-disable-next-line no-new
+        new EncryptionRESTController({ useCases: mockUseCases })
+      }, /Adapters library required/)
+    })
+
+    it('should require encryption use cases', () => {
+      assert.throws(() => {
+        // eslint-disable-next-line no-new
+        new EncryptionRESTController({ adapters: mockAdapters, useCases: {} })
+      }, /Encryption use cases required/)
+    })
+  })
+
+  describe('#root()', () => {
+    it('should return encryption status', async () => {
+      const req = createMockRequest()
+      const res = createMockResponse()
+
+      await uut.root(req, res)
+
+      assert.equal(res.statusValue, 200)
+      assert.deepEqual(res.jsonData, { status: 'encryption' })
+    })
+  })
+
+  describe('#getPublicKey()', () => {
+    it('should return public key on success', async () => {
+      const req = createMockRequestWithParams({
+        address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf'
+      })
+      const res = createMockResponse()
+
+      await uut.getPublicKey(req, res)
+
+      assert.equal(res.statusValue, 200)
+      assert.deepEqual(res.jsonData, {
+        success: true,
+        publicKey: '02abc123def456789'
+      })
+      assert.isTrue(mockUseCases.encryption.getPublicKey.calledOnce)
+      assert.isTrue(mockUseCases.encryption.getPublicKey.calledWith({
+        address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf'
+      }))
+    })
+
+    it('should return not found when public key is not found', async () => {
+      mockUseCases.encryption.getPublicKey.resolves({
+        success: false,
+        publicKey: 'not found'
+      })
+
+      const req = createMockRequestWithParams({
+        address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf'
+      })
+      const res = createMockResponse()
+
+      await uut.getPublicKey(req, res)
+
+      assert.equal(res.statusValue, 200)
+      assert.deepEqual(res.jsonData, {
+        success: false,
+        publicKey: 'not found'
+      })
+    })
+
+    it('should reject array addresses', async () => {
+      const req = createMockRequestWithParams({
+        address: ['addr1', 'addr2']
+      })
+      const res = createMockResponse()
+
+      await uut.getPublicKey(req, res)
+
+      assert.equal(res.statusValue, 400)
+      assert.deepEqual(res.jsonData, {
+        success: false,
+        error: 'address can not be an array.'
+      })
+      assert.isFalse(mockUseCases.encryption.getPublicKey.called)
+    })
+
+    it('should reject missing address', async () => {
+      const req = createMockRequestWithParams({})
+      const res = createMockResponse()
+
+      await uut.getPublicKey(req, res)
+
+      assert.equal(res.statusValue, 400)
+      assert.deepEqual(res.jsonData, {
+        success: false,
+        error: 'address is required.'
+      })
+      assert.isFalse(mockUseCases.encryption.getPublicKey.called)
+    })
+
+    it('should handle errors via handleError', async () => {
+      const error = new Error('No transaction history.')
+      error.status = 400
+      mockUseCases.encryption.getPublicKey.rejects(error)
+
+      const req = createMockRequestWithParams({
+        address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf'
+      })
+      const res = createMockResponse()
+
+      await uut.getPublicKey(req, res)
+
+      assert.equal(res.statusValue, 400)
+      assert.deepEqual(res.jsonData, {
+        success: false,
+        error: 'No transaction history.'
+      })
+    })
+
+    it('should default to 500 status for errors without status', async () => {
+      const error = new Error('Internal error')
+      mockUseCases.encryption.getPublicKey.rejects(error)
+
+      const req = createMockRequestWithParams({
+        address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf'
+      })
+      const res = createMockResponse()
+
+      await uut.getPublicKey(req, res)
+
+      assert.equal(res.statusValue, 500)
+      assert.deepEqual(res.jsonData, {
+        success: false,
+        error: 'Internal error'
+      })
+    })
+  })
+
+  describe('#handleError()', () => {
+    it('should use error status and message when provided', () => {
+      const error = new Error('Custom error')
+      error.status = 422
+      const res = createMockResponse()
+
+      uut.handleError(error, res)
+
+      assert.equal(res.statusValue, 422)
+      assert.deepEqual(res.jsonData, {
+        success: false,
+        error: 'Custom error'
+      })
+    })
+
+    it('should default to 500 and Internal server error', () => {
+      const error = {}
+      const res = createMockResponse()
+
+      uut.handleError(error, res)
+
+      assert.equal(res.statusValue, 500)
+      assert.deepEqual(res.jsonData, {
+        success: false,
+        error: 'Internal server error'
+      })
+    })
+  })
+})

test/unit/controllers/rest-api-index-unit.js

@@ -9,6 +9,7 @@ import RESTControllers from '../../../src/controllers/rest-api/index.js'
 import BlockchainRouter from '../../../src/controllers/rest-api/full-node/blockchain/router.js'
 import ControlRouter from '../../../src/controllers/rest-api/full-node/control/router.js'
 import DSProofRouter from '../../../src/controllers/rest-api/full-node/dsproof/router.js'
+import EncryptionRouter from '../../../src/controllers/rest-api/encryption/router.js'
 import MiningRouter from '../../../src/controllers/rest-api/full-node/mining/router.js'
 import PriceRouter from '../../../src/controllers/rest-api/price/router.js'
 import RawTransactionsRouter from '../../../src/controllers/rest-api/full-node/rawtransactions/router.js'
@@ -100,6 +101,9 @@ describe('#controllers/rest-api/index.js', () => {
         getMutableCid: () => {},
         decodeOpReturn: () => {},
         getCIDData: () => {}
+      },
+      encryption: {
+        getPublicKey: () => {}
       }
     }
   })
@@ -129,6 +133,7 @@ describe('#controllers/rest-api/index.js', () => {
       const blockchainAttachStub = sandbox.stub(BlockchainRouter.prototype, 'attach')
       const controlAttachStub = sandbox.stub(ControlRouter.prototype, 'attach')
       const dsproofAttachStub = sandbox.stub(DSProofRouter.prototype, 'attach')
+      const encryptionAttachStub = sandbox.stub(EncryptionRouter.prototype, 'attach')
       const fulcrumAttachStub = sandbox.stub(FulcrumRouter.prototype, 'attach')
       const miningAttachStub = sandbox.stub(MiningRouter.prototype, 'attach')
       const priceAttachStub = sandbox.stub(PriceRouter.prototype, 'attach')
@@ -148,6 +153,8 @@ describe('#controllers/rest-api/index.js', () => {
       assert.equal(controlAttachStub.getCall(0).args[0], app)
       assert.isTrue(dsproofAttachStub.calledOnce)
       assert.equal(dsproofAttachStub.getCall(0).args[0], app)
+      assert.isTrue(encryptionAttachStub.calledOnce)
+      assert.equal(encryptionAttachStub.getCall(0).args[0], app)
       assert.isTrue(fulcrumAttachStub.calledOnce)
       assert.equal(fulcrumAttachStub.getCall(0).args[0], app)
       assert.isTrue(miningAttachStub.calledOnce)

test/unit/use-cases/encryption-use-cases-unit.js

@@ -0,0 +1,247 @@
+/*
+  Unit tests for EncryptionUseCases.
+*/
+
+import { assert } from 'chai'
+import sinon from 'sinon'
+
+import EncryptionUseCases from '../../../src/use-cases/encryption-use-cases.js'
+
+describe('#encryption-use-cases.js', () => {
+  let sandbox
+  let mockAdapters
+  let mockUseCases
+  let mockBchjs
+  let uut
+
+  beforeEach(() => {
+    sandbox = sinon.createSandbox()
+    mockAdapters = {}
+
+    // Mock bchjs
+    mockBchjs = {
+      Address: {
+        toCashAddress: sandbox.stub().returns('bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf')
+      },
+      ECPair: {
+        fromPublicKey: sandbox.stub().returns({}),
+        toCashAddress: sandbox.stub().returns('bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf')
+      }
+    }
+
+    // Mock use cases
+    mockUseCases = {
+      fulcrum: {
+        getTransactions: sandbox.stub().resolves({
+          transactions: [
+            { tx_hash: 'abc123def456' }
+          ]
+        })
+      },
+      rawtransactions: {
+        getRawTransaction: sandbox.stub().resolves({
+          vin: [
+            {
+              scriptSig: {
+                asm: 'signature 02abc123def456789'
+              }
+            }
+          ]
+        })
+      }
+    }
+
+    uut = new EncryptionUseCases({
+      adapters: mockAdapters,
+      useCases: mockUseCases,
+      bchjs: mockBchjs
+    })
+  })
+
+  afterEach(() => {
+    sandbox.restore()
+  })
+
+  describe('#constructor()', () => {
+    it('should require adapters', () => {
+      assert.throws(() => {
+        // eslint-disable-next-line no-new
+        new EncryptionUseCases({ useCases: mockUseCases })
+      }, /Adapters instance required/)
+    })
+
+    it('should require useCases', () => {
+      assert.throws(() => {
+        // eslint-disable-next-line no-new
+        new EncryptionUseCases({ adapters: mockAdapters })
+      }, /UseCases instance required/)
+    })
+  })
+
+  describe('#getPublicKey()', () => {
+    it('should return public key when found', async () => {
+      const result = await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+
+      assert.isTrue(result.success)
+      assert.equal(result.publicKey, '02abc123def456789')
+      assert.isTrue(mockBchjs.Address.toCashAddress.calledOnce)
+      assert.isTrue(mockUseCases.fulcrum.getTransactions.calledOnce)
+      assert.isTrue(mockUseCases.rawtransactions.getRawTransaction.calledOnce)
+    })
+
+    it('should return not found when public key does not match', async () => {
+      // Make the ECPair.toCashAddress return a different address
+      mockBchjs.ECPair.toCashAddress.returns('bitcoincash:qqq000000000000000000000000000000000000000')
+
+      const result = await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+
+      assert.isFalse(result.success)
+      assert.equal(result.publicKey, 'not found')
+    })
+
+    it('should throw error when no transaction history', async () => {
+      mockUseCases.fulcrum.getTransactions.resolves({
+        transactions: []
+      })
+
+      try {
+        await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+        assert.fail('Should have thrown an error')
+      } catch (err) {
+        assert.equal(err.message, 'No transaction history.')
+      }
+    })
+
+    it('should handle transactions without scriptSig', async () => {
+      mockUseCases.rawtransactions.getRawTransaction.resolves({
+        vin: [
+          { txid: 'coinbase' } // No scriptSig
+        ]
+      })
+
+      const result = await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+
+      assert.isFalse(result.success)
+      assert.equal(result.publicKey, 'not found')
+    })
+
+    it('should handle invalid public key hex gracefully', async () => {
+      mockUseCases.rawtransactions.getRawTransaction.resolves({
+        vin: [
+          {
+            scriptSig: {
+              asm: 'signature NOT_VALID_HEX'
+            }
+          }
+        ]
+      })
+
+      const result = await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+
+      assert.isFalse(result.success)
+      assert.equal(result.publicKey, 'not found')
+    })
+
+    it('should handle ECPair.fromPublicKey throwing error', async () => {
+      mockBchjs.ECPair.fromPublicKey.throws(new Error('Invalid public key'))
+
+      const result = await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+
+      assert.isFalse(result.success)
+      assert.equal(result.publicKey, 'not found')
+    })
+
+    it('should search through multiple transactions', async () => {
+      // First transaction has no matching public key
+      mockUseCases.fulcrum.getTransactions.resolves({
+        transactions: [
+          { tx_hash: 'tx1' },
+          { tx_hash: 'tx2' }
+        ]
+      })
+
+      // Return different data for each tx - first tx has input with non-matching key
+      mockUseCases.rawtransactions.getRawTransaction
+        .onFirstCall().resolves({
+          vin: [
+            {
+              scriptSig: {
+                asm: 'sig 02aaa111bbb222ccc'
+              }
+            }
+          ]
+        })
+        .onSecondCall().resolves({
+          vin: [
+            {
+              scriptSig: {
+                asm: 'sig 02abc123def456789'
+              }
+            }
+          ]
+        })
+
+      // First tx doesn't match, second tx matches
+      mockBchjs.ECPair.toCashAddress
+        .onFirstCall().returns('bitcoincash:qqq000000000000000000000000000000000000000')
+        .onSecondCall().returns('bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf')
+
+      const result = await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+
+      assert.isTrue(result.success)
+      assert.equal(result.publicKey, '02abc123def456789')
+      assert.equal(mockUseCases.rawtransactions.getRawTransaction.callCount, 2)
+    })
+
+    it('should search through multiple inputs in a transaction', async () => {
+      mockUseCases.rawtransactions.getRawTransaction.resolves({
+        vin: [
+          {
+            scriptSig: {
+              asm: 'sig 02aaa111bbb222ccc'
+            }
+          },
+          {
+            scriptSig: {
+              asm: 'sig 02abc123def456789'
+            }
+          }
+        ]
+      })
+
+      // First input doesn't match, second input matches
+      mockBchjs.ECPair.toCashAddress
+        .onFirstCall().returns('bitcoincash:qqq000000000000000000000000000000000000000')
+        .onSecondCall().returns('bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf')
+
+      const result = await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+
+      assert.isTrue(result.success)
+      assert.equal(result.publicKey, '02abc123def456789')
+    })
+
+    it('should propagate fulcrum errors', async () => {
+      const error = new Error('Fulcrum API error')
+      mockUseCases.fulcrum.getTransactions.rejects(error)
+
+      try {
+        await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+        assert.fail('Should have thrown an error')
+      } catch (err) {
+        assert.equal(err.message, 'Fulcrum API error')
+      }
+    })
+
+    it('should propagate rawtransactions errors', async () => {
+      const error = new Error('RawTransactions API error')
+      mockUseCases.rawtransactions.getRawTransaction.rejects(error)
+
+      try {
+        await uut.getPublicKey({ address: 'bitcoincash:qrdka2205f4hyukutc2g0s6lykperc8nsu5u2ddpqf' })
+        assert.fail('Should have thrown an error')
+      } catch (err) {
+        assert.equal(err.message, 'RawTransactions API error')
+      }
+    })
+  })
+})

test/unit/use-cases/fulcrum-use-cases-unit.js

@@ -24,7 +24,7 @@ describe('#fulcrum-use-cases.js', () => {
     }
 
     // Create a mock BCHJS instance with stubbed sortAllTxs method
-    const mockBchjs = new BCHJS()
+    const mockBchjs = new BCHJS({ restURL: 'http://localhost:5942/v6/' })
     if (!mockBchjs.Electrumx) {
       mockBchjs.Electrumx = {}
     }

test/unit/use-cases/slp-use-cases-unit.js

@@ -32,7 +32,7 @@ describe('#slp-use-cases.js', () => {
     }
 
     // Create mock BCHJS
-    mockBchjs = new BCHJS()
+    mockBchjs = new BCHJS({ restURL: 'http://localhost:5942/v6/' })
     mockBchjs.Electrumx = {
       txData: sandbox.stub().resolves({
         details: {