C4 Block explorer

Bitcoin/Altcoin block explorer (unfinished)

An attempt to write a blockexplorer with an insight explorer compatible API.
Unfinished explorer and needs a lot of refactoring since it was my first attempt to write a Golang application.

Requirements

• Go 1.10 or 1.11

• Linux
• MongoDB
• dep https://github.com/golang/dep
• btc or altcoin wallet with RPC ports etc configured.

example config: cat ~/.viacoin/viacoin.conf

rpcuser=via
rpcpassword=via
rpcallowip=127.0.0.1
listen=1
server=1
daemon=1
txindex=1
whitelist=127.0.0.1
zmqpubhashblock=tcp://127.0.0.1:28332
zmqpubrawblock=tcp://127.0.0.1:28332
zmqrawblock=tcp://127.0.0.1:28332
zmqpubrawtx=tcp://127.0.0.1:28332

and in config/app.yml

server:
  ip: 127.0.0.1
  port: 8000

coin:
  name: Viacoin
  symbol: via
  algo: scrypt
  blocktime: 24

rpc:
  ip: 127.0.0.1
  username: via
  password: via
  port: 5222

zmq:
  endpoint: tcp://127.0.0.1:28332

Installation instructions can be found here: https://golang.org/doc/install. It is recommended to add $GOPATH/bin to your PATH at this point.

setup

cd ~/go/src/gitlab.com/

git clone git@gitlab.com:romanornr/blockexplorer.git

dep ensure

Build database

To create the database for the block explorer use

go run cmd/build.go

or build the binary with

go build cmd/build.go
./build

Run webserver

go run main.go

or build a binary with

go build main.go

Make sure the core wallet for the asset is running with the right RPC auth details
and make sure mongodb is running before you start.

TODO

• Solving Reorgs (priority)
• Complete frontend with Vuejs
• Adress validation
• Subsidy calculation for different coins instead of only viacoin
• API endpoint block raw
• Mempool unconfirmed transactions
• API block summaries
• API address properties
• API query multiple addresses
• Transaction broadcasting
• Access mogodbd from remote host (assumes localhost now)
• Support Postgresql too instead of Mongodb only

API

[
  {
    "address":"mo9ncXisMeAoXwqcV5EWuyncbmCcQN4rVs",
    "txid":"d5f8a96faccf79d4c087fa217627bb1120e83f8ea1a7d84b1de4277ead9bbac1",
    "vout":0,
    "scriptPubKey":"76a91453c0307d6851aa0ce7825ba883c6bd9ad242b48688ac",
    "amount":0.000006,
    "satoshis":600,
    "confirmations":0,
    "ts":1461349425
  },
  {
    "address": "mo9ncXisMeAoXwqcV5EWuyncbmCcQN4rVs",
    "txid": "bc9df3b92120feaee4edc80963d8ed59d6a78ea0defef3ec3cb374f2015bfc6e",
    "vout": 1,
    "scriptPubKey": "76a91453c0307d6851aa0ce7825ba883c6bd9ad242b48688ac",
    "amount": 0.12345678,
    "satoshis: 12345678,
    "confirmations": 1,
    "height": 300001
  }
]

The timestamp property will only be set for unconfirmed transactions and height can be used for determining block order. The confirmationsFromCache is nolonger set or necessary, confirmation count is only cached for the time between blocks.

There is a new GET endpoint or raw blocks at /rawblock/<blockHash>:

Response format:

{
  "rawblock": "blockhexstring..."
}

There are a few changes to the GET endpoint for /addr/[:address]:

• The list of txids in an address summary does not include orphaned transactions
• The txids will be sorted in block order
• The list of txids will be limited at 1000 txids
• There are two new query options "from" and "to" for pagination of the txids (e.g. /addr/[:address]?from=1000&to=2000)

Some additional general notes:

• The transaction history for an address will be sorted in block order
• The response for the /sync endpoint does not include startTs and endTs as the sync is no longer relevant as indexes are built in bitcoind.
• The endpoint for /peer is no longer relevant connection to bitcoind is via ZMQ.
• /tx endpoint results will now include block height, and spentTx related fields will be set to null if unspent.
• /block endpoint results does not include confirmations and will include poolInfo.

API HTTP Endpoints

Block

  /api/block/[:hash]
  /api/block/00000000a967199a2fad0877433c93df785a8d8ce062e5f9b451cd1397bdbf62

Block Index

Get block hash by height

  /api/block-index/[:height]
  /api/block-index/0

This would return:

{
  "blockHash":"000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
}

which is the hash of the Genesis block (0 height)

Raw Block

  /api/rawblock/[:blockHash]
  /api/rawblock/[:blockHeight]

This would return:

{
  "rawblock":"blockhexstring..."
}

Block Summaries

Get block summaries by date:

  /api/blocks?limit=3&blockDate=2016-04-22

Example response:

{
  "blocks": [
    {
      "height": 408495,
      "size": 989237,
      "hash": "00000000000000000108a1f4d4db839702d72f16561b1154600a26c453ecb378",
      "time": 1461360083,
      "txlength": 1695,
      "poolInfo": {
        "poolName": "BTCC Pool",
        "url": "https://pool.btcc.com/"
      }
    }
  ],
  "length": 1,
  "pagination": {
    "next": "2016-04-23",
    "prev": "2016-04-21",
    "currentTs": 1461369599,
    "current": "2016-04-22",
    "isToday": true,
    "more": true,
    "moreTs": 1461369600
  }
}

Transaction

  /api/tx/[:txid]
  /api/tx/525de308971eabd941b139f46c7198b5af9479325c2395db7f2fb5ae8562556c
  /api/rawtx/[:rawid]
  /api/rawtx/525de308971eabd941b139f46c7198b5af9479325c2395db7f2fb5ae8562556c

Address

  /api/addr/[:addr]
  /api/addr/[:addr][?noTxList=1][&from=&to=]
  /api/addr/mmvP3mTe53qxHdPqXEvdu8WdC7GfQ2vmx5?noTxList=1
  /api/addr/mmvP3mTe53qxHdPqXEvdu8WdC7GfQ2vmx5?from=1000&to=2000

Address Properties

  /api/addr/[:addr]/balance
  /api/addr/[:addr]/totalReceived
  /api/addr/[:addr]/totalSent
  /api/addr/[:addr]/unconfirmedBalance

The response contains the value in Satoshis.

Unspent Outputs (TODO)

  /api/addr/[:addr]/utxo

Sample return:

[
  {
    "address":"mo9ncXisMeAoXwqcV5EWuyncbmCcQN4rVs",
    "txid":"d5f8a96faccf79d4c087fa217627bb1120e83f8ea1a7d84b1de4277ead9bbac1",
    "vout":0,
    "scriptPubKey":"76a91453c0307d6851aa0ce7825ba883c6bd9ad242b48688ac",
    "amount":0.000006,
    "satoshis":600,
    "confirmations":0,
    "ts":1461349425
  },
  {
    "address": "mo9ncXisMeAoXwqcV5EWuyncbmCcQN4rVs",
    "txid": "bc9df3b92120feaee4edc80963d8ed59d6a78ea0defef3ec3cb374f2015bfc6e",
    "vout": 1,
    "scriptPubKey": "76a91453c0307d6851aa0ce7825ba883c6bd9ad242b48688ac",
    "amount": 0.12345678,
    "satoshis: 12345678,
    "confirmations": 1,
    "height": 300001
  }
]

Unspent Outputs for Multiple Addresses (TODO)

GET method:

  /api/addrs/[:addrs]/utxo
  /api/addrs/2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f/utxo

POST method:

  /api/addrs/utxo

POST params:

addrs: 2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f

Transactions by Block

  /api/txs/?block=HASH
  /api/txs/?block=00000000fa6cf7367e50ad14eb0ca4737131f256fc4c5841fd3c3f140140e6b6

Transactions by Address

  /api/txs/?address=ADDR
  /api/txs/?address=mmhmMNfBiZZ37g1tgg2t8DDbNoEdqKVxAL

Transactions for Multiple Addresses (TODO)

GET method:

  /api/addrs/[:addrs]/txs[?from=&to=]
  /api/addrs/2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f/txs?from=0&to=20

POST method:

  /api/addrs/txs

POST params:

addrs: 2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f
from (optional): 0
to (optional): 20
noAsm (optional): 1 (will omit script asm from results)
noScriptSig (optional): 1 (will omit the scriptSig from all inputs)
noSpent (option): 1 (will omit spent information per output)

Sample output:

{ totalItems: 100,
  from: 0,
  to: 20,
  items:
    [ { txid: '3e81723d069b12983b2ef694c9782d32fca26cc978de744acbc32c3d3496e915',
       version: 1,
       locktime: 0,
       vin: [Object],
       vout: [Object],
       blockhash: '00000000011a135e5277f5493c52c66829792392632b8b65429cf07ad3c47a6c',
       confirmations: 109367,
       time: 1393659685,
       blocktime: 1393659685,
       valueOut: 0.3453,
       size: 225,
       firstSeenTs: undefined,
       valueIn: 0.3454,
       fees: 0.0001 },
      { ... },
      { ... },
      ...
      { ... }
    ]
 }

Note: if pagination params are not specified, the result is an array of transactions.

Transaction Broadcasting (TODO)

POST method:

  /api/tx/send

POST params:

  rawtx: "signed transaction as hex string"

  eg

  rawtx: 01000000017b1eabe0209b1fe794124575ef807057c77ada2138ae4fa8d6c4de0398a14f3f00000000494830450221008949f0cb400094ad2b5eb399d59d01c14d73d8fe6e96df1a7150deb388ab8935022079656090d7f6bac4c9a94e0aad311a4268e082a725f8aeae0573fb12ff866a5f01ffffffff01f0ca052a010000001976a914cbc20a7664f2f69e5355aa427045bc15e7c6c77288ac00000000

POST response:

  {
      txid: [:txid]
  }

  eg

  {
      txid: "c7736a0a0046d5a8cc61c8c3c2821d4d7517f5de2bc66a966011aaa79965ffba"
  }

Historic Blockchain Data Sync Status (TODO)

  /api/sync

Live Network P2P Data Sync Status (TODO)

  /api/peer

Status of the Bitcoin Network (TODO)

  /api/status?q=xxx

Where "xxx" can be:

• getInfo
• getDifficulty
• getBestBlockHash
• getLastBlockHash