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Blockbook API

Blockbook provides REST, websocket and socket.io API to the indexed blockchain.

There are two versions of provided API.

Legacy API V1

The legacy API is a compatible subset of API provided by Bitcore Insight. It supports only Bitcoin-type coins. The details of the REST/socket.io requests can be found in the Insight's documentation.

REST API

GET /api/v1/block-index/<block height>
GET /api/v1/tx/<txid>
GET /api/v1/address/<address>
GET /api/v1/utxo/<address>
GET /api/v1/block/<block height | block hash>
GET /api/v1/estimatefee/<number of blocks>
GET /api/v1/sendtx/<hex tx data>
POST /api/v1/sendtx (hex tx data in request body)

Socket.io API

Socket.io interface is provided at /socket.io/. The interface also can be explored using Blockbook Socket.io Test Page found at /test-socketio.html.

The legacy API is provided as is and will not be further developed.

The legacy API is currently (Blockbook v0.3.1) also accessible without the /v1/ prefix, however in the future versions the version less access will be removed.

API V2

API V2 is the current version of API. It can be used with all coin types that Blockbook supports. API V2 can be accessed using REST and websocket interface.

Common principles used in API V2:

  • all amounts are transferred as strings, in the lowest denomination (satoshis, wei, ...), without decimal point
  • empty fields are omitted. Empty field is a string of value null or "", a number of value 0, an object of value null or an array without elements. The reason for this is that the interface serves many different coins which use only subset of the fields. Sometimes this principle can lead to slightly confusing results, for example when transaction version is 0, the field version is omitted.

REST API

The following methods are supported:

Status page

Status page returns current status of Blockbook and connected backend.

GET /api

Response:

{
  "blockbook": {
    "coin": "Bitcoin",
    "host": "blockbook",
    "version": "0.3.1",
    "gitCommit": "3d9ad91",
    "buildTime": "2019-05-17T14:34:00+00:00",
    "syncMode": true,
    "initialSync": false,
    "inSync": true,
    "bestHeight": 577261,
    "lastBlockTime": "2019-05-22T18:03:33.547762973+02:00",
    "inSyncMempool": true,
    "lastMempoolTime": "2019-05-22T18:10:10.27929383+02:00",
    "mempoolSize": 17348,
    "decimals": 8,
    "dbSize": 191887866502,
    "about": "Blockbook - blockchain indexer for Trezor wallet https://trezor.io/. Do not use for any other purpose."
  },
  "backend": {
    "chain": "main",
    "blocks": 577261,
    "headers": 577261,
    "bestBlockHash": "0000000000000000000ca8c902aa58b3118a7f35d093e25a07f17bcacd91cabf",
    "difficulty": "6704632680587.417",
    "sizeOnDisk": 250504188580,
    "version": "180000",
    "subversion": "/Satoshi:0.18.0/",
    "protocolVersion": "70015",
    "timeOffset": 0,
    "warnings": ""
  }
}

Get block hash

GET /api/v2/block-index/<block height>

Response:

{
  "blockHash": "ed8f3af8c10ca70a136901c6dd3adf037f0aea8a93fbe9e80939214034300f1e"
}

Note: Blockbook always follows the main chain of the backend it is attached to. See notes on Get Block below

Get transaction

Get transaction returns "normalized" data about transaction, which has the same general structure for all supported coins. It does not return coin specific fields (for example information about Zcash shielded addresses).

GET /api/v2/tx/<txid>

Response for Bitcoin-type coins:

{
  "txid": "9e2bc8fbd40af17a6564831f84aef0cab2046d4bad19e91c09d21bff2c851851",
  "version": 1,
  "vin": [
    {
      "txid": "f124e6999bf67e710b9e8a8ac4dbb08a64aa9c264120cf98793455e36a531615",
      "vout": 2,
      "sequence": 4294967295,
      "n": 0,
      "addresses": [
        "DDhUv8JZGmSxKYV95NLnbRTUKni9cDZD3S"
      ],
      "isAddress": true,
      "value": "55795108999999",
      "hex": "473...2c7ec77bb982"
    }
  ],
  "vout": [
    {
      "value": "55585679000000",
      "n": 0,
      "hex": "76a914feaca9d9fa7120c7c587c00c639bb18d40faadd388ac",
      "addresses": [
        "DUMh1rPrXTrCN2Z9EHsLPg7b78rACHB2h7"
      ],
      "isAddress": true
    },
    {
      "value": "209329999999",
      "n": 1,
      "hex": "76a914ea8984be785868391d92f49c14933f47c152ea0a88ac",
      "addresses": [
        "DSXDQ6rnwLX47WFRnemctoXPHA9pLMxqXn"
      ],
      "isAddress": true
    }
  ],
  "blockHash": "78d1f3de899a10dd2e580704226ebf9508e95e1706f177fc9c31c47f245d2502",
  "blockHeight": 2647927,
  "confirmations": 1,
  "blockTime": 1553088212,
  "value": "55795008999999",
  "valueIn": "55795108999999",
  "fees": "100000000",
  "hex": "0100000...0011000"
}

Response for Ethereum-type coins. There is always only one vin, only one vout, possibly an array of tokenTransfers and ethereumSpecific part. Missing is hex field:

{
  "txid": "0xb78a36a4a0e7d708d595c3b193cace8f5b420e72e1f595a5387d87de509f0806",
  "vin": [
    {
      "n": 0,
      "addresses": [
        "0x9c2e011c0ce0d75c2b62b9c5a0ba0a7456593803"
      ],
      "isAddress": true
    }
  ],
  "vout": [
    {
      "value": "0",
      "n": 0,
      "addresses": [
        "0xc32ae45504ee9482db99cfa21066a59e877bc0e6"
      ],
      "isAddress": true
    }
  ],
  "blockHash": "0x39df7fb0893200e1e78c04f98691637a89b64e7a3edd96c16f2537e2fd56c414",
  "blockHeight": 5241585,
  "confirmations": 3,
  "blockTime": 1553088337,
  "value": "0",
  "fees": "402501000000000",
  "tokenTransfers": [
    {
      "type": "ERC20",
      "from": "0x9c2e011c0ce0d75c2b62b9c5a0ba0a7456593803",
      "to": "0x583cbbb8a8443b38abcc0c956bece47340ea1367",
      "token": "0xc32ae45504ee9482db99cfa21066a59e877bc0e6",
      "name": "Tangany Test Token",
      "symbol": "TATETO",
      "decimals": 18,
      "value": "133800000"
    }
  ],
  "ethereumSpecific": {
    "status": 1,
    "nonce": 2830,
    "gasLimit": 36591,
    "gasUsed": 36591,
    "gasPrice": "11000000000"
  }
}

A note about the blockTime field:

  • for already mined transaction (confirmations > 0), the field blockTime contains time of the block
  • for transactions in mempool (confirmations == 0), the field contains time when the running instance of Blockbook was first time notified about the transaction. This time may be different in different instances of Blockbook.

Get transaction specific

Returns transaction data in the exact format as returned by backend, including all coin specific fields:

GET /api/v2/tx-specific/<txid>

Example response:

{
  "hex": "040000808...8e6e73cb009",
  "txid": "7a0a0ff6f67bac2a856c7296382b69151949878de6fb0d01a8efa197182b2913",
  "overwintered": true,
  "version": 4,
  "versiongroupid": "892f2085",
  "locktime": 0,
  "expiryheight": 495680,
  "vin": [],
  "vout": [],
  "vjoinsplit": [],
  "valueBalance": 0,
  "vShieldedSpend": [
    {
      "cv": "50258bfa65caa9f42f4448b9194840c7da73afc8159faf7358140bfd0f237962",
      "anchor": "6beb3b64ecb30033a9032e1a65a68899917625d1fdd2540e70f19f3078f5dd9b",
      "nullifier": "08e5717f6606af7c2b01206ff833eaa6383bb49c7451534b2e16d588956fd10a",
      "rk": "36841a9be87a7022445b77f433cdd0355bbed498656ab399aede1e5285e9e4a2",
      "proof": "aecf824dbae8eea863ec6...73878c37391f01df520aa",
      "spendAuthSig": "65b9477cb1ec5da...1178fe402e5702c646945197108339609"
    },
    {
      "cv": "a5aab3721e33d6d6360eabd21cbd07524495f202149abdc3eb30f245d503678c",
      "anchor": "6beb3b64ecb30033a9032e1a65a68899917625d1fdd2540e70f19f3078f5dd9b",
      "nullifier": "60e790d6d0e12e777fb2b18bc97cf42a92b1e47460e1bd0b0ffd294c23232cc9",
      "rk": "2d741695e76351597712b4a04d2a4e108a116f376283d2d104219b86e2930117",
      "proof": "a0c2a6fdcbba966b9894...3a9c3118b76c8e2352d524cbb44c02decaeda7",
      "spendAuthSig": "feea902e01eac9ebd...b43b4af6b607ce5b0b38f708"
    }
  ],
  "vShieldedOutput": [
    {
      "cv": "23db384cde862f20238a1004e57ba18f114acabc7fd2ac029757f82af5bd4cab",
      "cmu": "3ff5a5ff521fabefb5287fef4feb2642d69ead5fe18e6ac717cfd76a8d4088bc",
      "ephemeralKey": "057ff6e059967784fa6ac34ad9ecfd9c0c0aba743b7cd444a65ecc32192d5870",
      "encCiphertext": "a533d3b99b...a0204",
      "outCiphertext": "4baabc15199504b1...c1ad6a",
      "proof": "aa1fb2706cba5...1ec7e81f5deea90d4f57713f3b4fc8d636908235fa378ebf1"
    }
  ],
  "bindingSig": "bc018af8808387...5130bb382ad8e6e73cb009",
  "blockhash": "0000000001c4aa394e796dd1b82e358f114535204f6f5b6cf4ad58dc439c47af",
  "confirmations": 5222,
  "time": 1552301566,
  "blocktime": 1552301566
}

Get address

Returns balances and transactions of an address. The returned transactions are sorted by block height, newest blocks first.

GET /api/v2/address/<address>[?page=<page>&pageSize=<size>&from=<block height>&to=<block height>&details=<basic|tokens|tokenBalances|txids|txs>]

The optional query parameters:

  • page: specifies page of returned transactions, starting from 1. If out of range, Blockbook returns the closest possible page.
  • pageSize: number of transactions returned by call (default and maximum 1000)
  • from, to: filter of the returned transactions from block height to block height (default no filter)
  • details: specifies level of details returned by request (default txids)
    • basic: return only address balances, without any transactions
    • tokens: basic + tokens belonging to the address (applicable only to some coins)
    • tokenBalances: basic + tokens with balances + belonging to the address (applicable only to some coins)
    • txids: tokenBalances + list of txids, subject to from, to filter and paging
    • txs: tokenBalances + list of transaction with details, subject to from, to filter and paging

Response:

{
  "page": 1,
  "totalPages": 1,
  "itemsOnPage": 1000,
  "address": "D5Z7XrtJNg7hAtznSDMXvfiFmMYphwuWz7",
  "balance": "2432468097999991",
  "totalReceived": "3992283916999979",
  "totalSent": "1559815818999988",
  "unconfirmedBalance": "0",
  "unconfirmedTxs": 0,
  "txs": 3,
  "txids": [
    "461dd46d5d6f56d765f82e60e6bf0727a3a1d1cb8c4144373d805b152a21d308",
    "bdb5b47603c5d174eae3384c368068c8e9d2183b398ed0e31d125defa4447a10",
    "5c1d2686d70d82bd8e84b5d3dc4bd0e8485e28cdc865336db6a5e40b2098277d"
  ]
}

Get xpub

Returns balances and transactions of an xpub, applicable only for Bitcoin-type coins.

Blockbook supports BIP44, BIP49 and BIP84 derivation schemes. It expects xpub at level 3 derivation path, i.e. m/purpose'/coin_type'/account'/. Blockbook completes the change/address_index part of the path when deriving addresses.

The BIP version is determined by the prefix of the xpub. The prefixes for each coin are defined by fields xpub_magic, xpub_magic_segwit_p2sh, xpub_magic_segwit_native in the trezor-common library. If the prefix is not recognized, Blockbook defaults to BIP44 derivation scheme.

The returned transactions are sorted by block height, newest blocks first.

GET /api/v2/xpub/<xpub>[?page=<page>&pageSize=<size>&from=<block height>&to=<block height>&details=<basic|tokens|tokenBalances|txids|txs>&tokens=<nonzero|used|derived>]

The optional query parameters:

  • page: specifies page of returned transactions, starting from 1. If out of range, Blockbook returns the closest possible page.
  • pageSize: number of transactions returned by call (default and maximum 1000)
  • from, to: filter of the returned transactions from block height to block height (default no filter)
  • details: specifies level of details returned by request (default txids)
    • basic: return only xpub balances, without any derived addresses and transactions
    • tokens: basic + tokens (addresses) derived from the xpub, subject to tokens parameter
    • tokenBalances: basic + tokens (addresses) derived from the xpub with balances, subject to tokens parameter
    • txids: tokenBalances + list of txids, subject to from, to filter and paging
    • txs: tokenBalances + list of transaction with details, subject to from, to filter and paging
  • tokens: specifies what tokens (xpub addresses) are returned by the request (default nonzero)
    • nonzero: return only addresses with nonzero balance
    • used: return addresses with at least one transaction
    • derived: return all derived addresses

Response:

{
  "page": 1,
  "totalPages": 1,
  "itemsOnPage": 1000,
  "address": "dgub8sbe5Mi8LA4dXB9zPfLZW8arm...9Vjp2HHx91xdDEmWYpmD49fpoUYF",
  "balance": "0",
  "totalReceived": "3083381250",
  "totalSent": "3083381250",
  "unconfirmedBalance": "0",
  "unconfirmedTxs": 0,
  "txs": 5,
  "txids": [
    "383ccb5da16fccad294e24a2ef77bdee5810573bb1b252d8b2af4f0ac8c4e04c",
    "75fb93d47969ac92112628e39148ad22323e96f0004c18f8c75938cffb6c1798",
    "e8cd84f204b4a42b98e535e72f461dd9832aa081458720b0a38db5856a884876",
    "57833d50969208091bd6c950599a1b5cf9d66d992ae8a8d3560fb943b98ebb23",
    "9cfd6295f20e74ddca6dd816c8eb71a91e4da70fe396aca6f8ce09dc2947839f",
  ],
  "usedTokens": 2,
  "tokens": [
    {
      "type": "XPUBAddress",
      "name": "DUCd1B3YBiXL5By15yXgSLZtEkvwsgEdqS",
      "path": "m/44'/3'/0'/0/0",
      "transfers": 3,
      "decimals": 8,
      "balance": "0",
      "totalReceived": "2803986975",
      "totalSent": "2803986975"
    },
    {
      "type": "XPUBAddress",
      "name": "DKu2a8Wo6zC2dmBBYXwUG3fxWDHbKnNiPj",
      "path": "m/44'/3'/0'/1/0",
      "transfers": 2,
      "decimals": 8,
      "balance": "0",
      "totalReceived": "279394275",
      "totalSent": "279394275"
    }
  ]
}

Note: usedTokens always returns total number of used addresses of xpub.

Get utxo

Returns array of unspent transaction outputs of address or xpub, applicable only for Bitcoin-type coins. By default, the list contains both confirmed and unconfirmed transactions. The query parameter confirmed=true disables return of unconfirmed transactions. The returned utxos are sorted by block height, newest blocks first. For xpubs the response also contains address and derivation path of the utxo.

Unconfirmed utxos do not have field height, the field confirmations has value 0 and may contain field lockTime, if not zero.

Coinbase utxos do have field coinbase set to true, however due to performance reasons only up to minimum coinbase confirmations limit (100). After this limit, utxos are not detected as coinbase.

GET /api/v2/utxo/<address|xpub>[?confirmed=true]

Response:

[
  {
    "txid": "13d26cd939bf5d155b1c60054e02d9c9b832a85e6ec4f2411be44b6b5a2842e9",
    "vout": 0,
    "value": "1422303206539",
    "confirmations": 0,
    "lockTime": 2648100
  },
  {
    "txid": "a79e396a32e10856c97b95f43da7e9d2b9a11d446f7638dbd75e5e7603128cac",
    "vout": 1,
    "value": "39748685",
    "height": 2648043,
    "confirmations": 47,
    "coinbase": true
  },
  {
    "txid": "de4f379fdc3ea9be063e60340461a014f372a018d70c3db35701654e7066b3ef",
    "vout": 0,
    "value": "122492339065",
    "height": 2646043,
    "confirmations": 2047
  },
  {
    "txid": "9e8eb9b3d2e8e4b5d6af4c43a9196dfc55a05945c8675904d8c61f404ea7b1e9",
    "vout": 0,
    "value": "142771322208",
    "height": 2644885,
    "confirmations": 3205
  }
]

Get block

Returns information about block with transactions, subject to paging.

GET /api/v2/block/<block height|block hash>

Response:

{
  "page": 1,
  "totalPages": 1,
  "itemsOnPage": 1000,
  "hash": "760f8ed32894ccce9c1ea11c8a019cadaa82bcb434b25c30102dd7e43f326217",
  "previousBlockHash": "786a1f9f38493d32fd9f9c104d748490a070bc74a83809103bcadd93ae98288f",
  "nextBlockHash": "151615691b209de41dda4798a07e62db8429488554077552ccb1c4f8c7e9f57a",
  "height": 2648059,
  "confirmations": 47,
  "size": 951,
  "time": 1553096617,
  "version": 6422787,
  "merkleRoot": "6783f6083788c4f69b8af23bd2e4a194cf36ac34d590dfd97e510fe7aebc72c8",
  "nonce": "0",
  "bits": "1a063f3b",
  "difficulty": "2685605.260733312",
  "txCount": 2,
  "txs": [
    {
      "txid": "2b9fc57aaa8d01975631a703b0fc3f11d70671953fc769533b8078a04d029bf9",
      "vin": [
        {
          "n": 0,
          "value": "0"
        }
      ],
      "vout": [
        {
          "value": "1000100000000",
          "n": 0,
          "addresses": [
            "D6ravJL6Fgxtgp8k2XZZt1QfUmwwGuLwQJ"
          ],
          "isAddress": true
        }
      ],
      "blockHash": "760f8ed32894ccce9c1ea11c8a019cadaa82bcb434b25c30102dd7e43f326217",
      "blockHeight": 2648059,
      "confirmations": 47,
      "blockTime": 1553096617,
      "value": "1000100000000",
      "valueIn": "0",
      "fees": "0"
    },
    {
      "txid": "d7ce10ecf9819801ecd6ee045cbb33436eef36a7db138206494bacedfd2832cf",
      "vin": [
        {
          "n": 0,
          "addresses": [
            "9sLa1AKzjWuNTe1CkLh5GDYyRP9enb1Spp"
          ],
          "isAddress": true,
          "value": "1277595845202"
        }
      ],
      "vout": [
        {
          "value": "9900000000",
          "n": 0,
          "addresses": [
            "DMnjrbcCEoeyvr7GEn8DS4ZXQjwq7E2zQU"
          ],
          "isAddress": true
        },
        {
          "value": "1267595845202",
          "n": 1,
          "spent": true,
          "addresses": [
            "9sLa1AKzjWuNTe1CkLh5GDYyRP9enb1Spp"
          ],
          "isAddress": true
        }
      ],
      "blockHash": "760f8ed32894ccce9c1ea11c8a019cadaa82bcb434b25c30102dd7e43f326217",
      "blockHeight": 2648059,
      "confirmations": 47,
      "blockTime": 1553096617,
      "value": "1277495845202",
      "valueIn": "1277595845202",
      "fees": "100000000"
    }
  ]
}

Note: Blockbook always follows the main chain of the backend it is attached to. If there is a rollback-reorg in the backend, Blockbook will also do rollback. When you ask for block by height, you will always get the main chain block. If you ask for block by hash, you may get the block from another fork but it is not guaranteed (backend may not keep it)

Send transaction

Sends new transaction to backend.

GET /api/v2/sendtx/<hex tx data>
POST /api/v2/sendtx (hex tx data in request body)

Response:

{
  "result": "7c3be24063f268aaa1ed81b64776798f56088757641a34fb156c4f51ed2e9d25"
}

or in case of error

{
  "error": {
    "message": "error message"
  }
}

Websocket API

Websocket interface is provided at /websocket/. The interface can be explored using Blockbook Websocket Test Page found at /test-websocket.html.

The websocket interface provides the following requests:

  • getInfo
  • getBlockHash
  • getAccountInfo
  • getAccountUtxo
  • getTransaction
  • getTransactionSpecific
  • estimateFee
  • sendTransaction
  • ping

The client can subscribe to the following events:

  • new block added to blockchain
  • new transaction for given address (list of addresses)

There can be always only one subscription of given event per connection, i.e. new list of addresses replaces previous list of addresses.

Note: If there is reorg on the backend (blockchain), you will get a new block hash with the same or even smaller height if the reorg is deeper