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Bitcoin Cash Explorer Setup

Separate readme for setting-up the Explorer for Bitcoin Cash (BCH). BCH Explorer is a fork from the mempool project, adjusted for BCH (and soon as also support cash token, cash fusion and other BCH specific features).

Frontend Setup

Use the following frontend configuration file (mempool-frontend-config.json) to configure Bitcoin Cash (BCH) as the mempool site.

To configure Bitcoin Cash Explorer execute: npm run config:defaults:mempool.cash.

Or alternatively manually create the mempool-frontend-config.json file inside the frontend sub-directory, with the following content:

{
  "TESTNET_ENABLED": false,
  "SIGNET_ENABLED": false,
  "LIQUID_ENABLED": false,
  "LIQUID_TESTNET_ENABLED": false,
  "BISQ_ENABLED": false,
  "BISQ_SEPARATE_BACKEND": false,
  "ITEMS_PER_PAGE": 25,
  "BLOCK_WEIGHT_UNITS": 4000000,
  "BASE_MODULE": "mempool.cash",
  "MINING_DASHBOARD": true,
  "LIGHTNING": false
}

Backend Setup

For the backend use the following mempool-config.json file:

{
  "MEMPOOL": {
    "NETWORK": "mainnet",
    "BACKEND": "electrum",
    "ENABLED": true,
    "HTTP_PORT": 8999,
    "SPAWN_CLUSTER_PROCS": 0,
    "API_URL_PREFIX": "/api/v1/",
    "POLL_RATE_MS": 1000,
    "CACHE_DIR": "./cache",
    "CLEAR_PROTECTION_MINUTES": 5,
    "RECOMMENDED_FEE_PERCENTILE": 50,
    "INITIAL_BLOCKS_AMOUNT": 8,
    "MEMPOOL_BLOCKS_AMOUNT": 8,
    "INDEXING_BLOCKS_AMOUNT": -1,
    "BLOCKS_SUMMARIES_INDEXING": true,
    "BLOCK_LIMIT_SIZE_BYTES": 32000000,
    "PRICE_FEED_UPDATE_INTERVAL": 600,
    "USE_SECOND_NODE_FOR_MINFEE": false,
    "EXTERNAL_ASSETS": [],
    "EXTERNAL_MAX_RETRY": 1,
    "EXTERNAL_RETRY_INTERVAL": 0,
    "USER_AGENT": "mempool",
    "STDOUT_LOG_MIN_PRIORITY": "debug",
    "AUTOMATIC_BLOCK_REINDEXING": false,
    "POOLS_JSON_URL": "https://raw.githubusercontent.com/BitcoinCash1/mining-pools/master/pools.json",
    "POOLS_JSON_TREE_URL": "https://api.github.com/repos/BitcoinCash1/mining-pools/git/trees/master",
    "ADVANCED_TRANSACTION_SELECTION": false
  },
  "CORE_RPC": {
    "HOST": "127.0.0.1",
    "PORT": 8332,
    "USERNAME": "mempool",
    "PASSWORD": "secret"
  },
  "ELECTRUM": {
    "HOST": "127.0.0.1",
    "PORT": 50001,
    "TLS_ENABLED": false
  },
  "ESPLORA": {
    "REST_API_URL": "http://127.0.0.1:3000"
  },
  "SECOND_CORE_RPC": {
    "HOST": "127.0.0.1",
    "PORT": 8332,
    "USERNAME": "mempool",
    "PASSWORD": "mempool"
  },
  "DATABASE": {
    "ENABLED": true,
    "HOST": "127.0.0.1",
    "PORT": 3306,
    "SOCKET": "/var/run/mysqld/mysqld.sock",
    "DATABASE": "mempool",
    "USERNAME": "mempool",
    "PASSWORD": "your_password"
  },
  "SYSLOG": {
    "ENABLED": true,
    "HOST": "127.0.0.1",
    "PORT": 514,
    "MIN_PRIORITY": "debug",
    "FACILITY": "local7"
  },
  "STATISTICS": {
    "ENABLED": true,
    "TX_PER_SECOND_SAMPLE_PERIOD": 150
  },
  "MAXMIND": {
    "ENABLED": false,
    "GEOLITE2_CITY": "/usr/local/share/GeoIP/GeoLite2-City.mmdb",
    "GEOLITE2_ASN": "/usr/local/share/GeoIP/GeoLite2-ASN.mmdb",
    "GEOIP2_ISP": "/usr/local/share/GeoIP/GeoIP2-ISP.mmdb"
  },
  "BISQ": {
    "ENABLED": false,
    "DATA_PATH": "/bisq/statsnode-data/btc_mainnet/db"
  },
  "LIGHTNING": {
    "ENABLED": false,
    "BACKEND": "lnd",
    "STATS_REFRESH_INTERVAL": 600,
    "GRAPH_REFRESH_INTERVAL": 600,
    "LOGGER_UPDATE_INTERVAL": 30,
    "FORENSICS_INTERVAL": 43200
  },
  "LND": {
    "TLS_CERT_PATH": "tls.cert",
    "MACAROON_PATH": "readonly.macaroon",
    "REST_API_URL": "https://localhost:8080"
  },
  "CLIGHTNING": {
    "SOCKET": "lightning-rpc"
  },
  "SOCKS5PROXY": {
    "ENABLED": false,
    "USE_ONION": true,
    "HOST": "127.0.0.1",
    "PORT": 9050,
    "USERNAME": "",
    "PASSWORD": ""
  },
  "PRICE_DATA_SERVER": {
    "TOR_URL": "",
    "CLEARNET_URL": "https://finance.melroy.org/v1"
  },
  "EXTERNAL_DATA_SERVER": {
    "MEMPOOL_API": "https://mempool.space/api/v1",
    "MEMPOOL_ONION": "http://mempoolhqx4isw62xs7abwphsq7ldayuidyx2v2oethdhhj6mlo2r6ad.onion/api/v1",
    "LIQUID_API": "https://liquid.network/api/v1",
    "LIQUID_ONION": "http://liquidmom47f6s3m53ebfxn47p76a6tlnxib3wp6deux7wuzotdr6cyd.onion/api/v1",
    "BISQ_URL": "https://bisq.markets/api",
    "BISQ_ONION": "http://bisqmktse2cabavbr2xjq7xw3h6g5ottemo5rolfcwt6aly6tp5fdryd.onion/api"
  }
}

After you created the mempool-config.json file, we can build the backend (using npm run build) OR use the pre-build Docker image. In this example we will leverage Docker in order to run the BCH Explorer backend.

I'm using Docker compose to start the Docker container, and mount the correct files/folders.

Next, we will create a bch-explorer-compose.yml file (chang the left side of the mounting volumes to your needs):

version: "3"
services:
  bch-explorer-backend:
    image: danger89/bch-explorer-backend
    container_name: bch-explorer-backend
    restart: always
    networks:
      - bch_explorer_external_network
    volumes:
      - /home/folder_to/mempool-config.json:/backend/mempool-config.json
      - /home/folder_to/bch-explorer-cache:/backend/cache
      - /var/run/mysqld/mysqld.sock:/run/mysqld/mysqld.sock
    ports:
      - "127.0.0.1:8999:8999"
    extra_hosts:
      - "host.docker.internal:host-gateway"

networks:
  bch_explorer_external_network:

To start the Docker container, use: docker-compose --file bch-explorer-compose.yml up -d (omit the -d if you do NOT want to start the service in the background).

Or when not using Docker, execute: npm run start-production

Note 1: As you can see, I run the service in host network mode, but you can also create a dedicated Docker bridge network. In that case, be sure you are able to connect Fulcrum and BCHN full node services as well.

Note 2: I'm using the MariaDB (MySQL) server on my host machine, you can also create a dedicated database docker container (eg. using mariadb image) in the Docker compose config, and connect the two services.

Deployment Setup

We still use MySQL (MariaDB) as the database to index our data, just like the upstream project.

But we use the BCHN full node software as your Bitcoin Cash full-node. Furthermore, in order to lookup addresses you need to have an Electrum server backend, we use Fulcrum as our Bitcoin Cash SPV server.

Update from Upstream / File Overlap

Background: I'm trying to create as less of a file overlap as possible, making rebasing / remote fetch as easy as possible with the upstream repo.
Therefore I created separate Angular Components (with -bch suffix in the name) designed specifically for Bitcoin Cash, leaving the BTC code intact as well. Itry to do the same for the backend code.

Frontend file overlap

Files that do have file overlap in the frontend (frontend folder) are:

  • src/app/app-routing.module.ts
  • src/app/components/block/block.component.ts
  • src/app/docs/docs/docs.component.ts
  • src/app/shared/pipes/bytes-pipe/bytes.pipe.ts (trying to fix this file upstream)
  • src/app/shared/shared.module.ts
  • src/app/app.module.ts
  • src/favicon.ico
  • src/resources/favicons
  • sync-assets.js

Backend file overlap

Files that do have file overlap in the backend (backend folder) are:

  • src/config.ts
  • src/index.ts
  • src/indexer.ts
  • src/rpc-api/index.ts
  • src/__fixtures__/mempool-config.template.json
  • src/__tests__/config.test.ts

General file overlap

  • README.md

Update with upstream

IMPORTANT: We want our changes to be on-top of the upstream commits. Meaning we only do git rebase from upstream. This will result into a clean git history / commit history, where all the upstream mempool changes are below our additional BCH commit(s).

In order to achieve this, you need to execute the following steps:

  1. Add the upstream repo: git remote add upstream https://github.com/mempool/mempool.git

  2. Switch to the master branch: git checkout master

  3. Update master branch info from remote upstream using: git pull upstream

  4. Update our master branch with the upstream changes: git rebase upstream/master

  5. Push the local master the our remote server: git push

  6. Now we switch to the bch branch: git checkout bch

  7. So now it's important to do a rebase as well, within the bch branch: git rebase master

  8. Validate & test the changes with our Bitcoin Cash configuration, the rebase could after all breaks some stuff.

  9. Finally, push the latest changes of the bch branch to the server. This will require a force rewrite of git history.
    !!Extra Attention Required!!! If you break the code/remove BCH code accidentally or something else stupid during this process. A git force push will remove the data FOREVER. This is therefore no longer irreversible!

    git push -f

That's it!