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REST-interface.md

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Unauthenticated REST Interface

The REST API can be enabled with the -rest option.

The interface runs on the same port as the JSON-RPC interface, by default port 6214 for mainnet, port 18332 for testnet, and port 18443 for regtest.

Supported API

Transactions

GET /rest/tx/<TX-HASH>.<bin|hex|json>

Given a transaction hash: returns a transaction in binary, hex-encoded binary, or JSON formats.

For full TX query capability, one must enable the transaction index via "txindex=1" command line / configuration option.

Blocks

GET /rest/block/<BLOCK-HASH>.<bin|hex|json> GET /rest/block/notxdetails/<BLOCK-HASH>.<bin|hex|json>

Given a block hash: returns a block, in binary, hex-encoded binary or JSON formats.

The HTTP request and response are both handled entirely in-memory, thus making maximum memory usage at least 2.66MB (1 MB max block, plus hex encoding) per request.

With the /notxdetails/ option JSON response will only contain the transaction hash instead of the complete transaction details. The option only affects the JSON response.

Blockheaders

GET /rest/headers/<COUNT>/<BLOCK-HASH>.<bin|hex|json>

Given a block hash: returns amount of blockheaders in upward direction.

Chaininfos

GET /rest/chaininfo.json

Returns various state info regarding block chain processing. Only supports JSON as output format.

  • chain : (string) current network name as defined in BIP70 (main, test, regtest)
  • blocks : (numeric) the current number of blocks processed in the server
  • headers : (numeric) the current number of headers we have validated
  • bestblockhash : (string) the hash of the currently best block
  • difficulty : (numeric) the current difficulty
  • mediantime : (numeric) the median time of the 11 blocks before the most recent block on the blockchain
  • verificationprogress : (numeric) estimate of verification progress [0..1]
  • chainwork : (string) total amount of work in active chain, in hexadecimal
  • pruned : (boolean) if the blocks are subject to pruning
  • pruneheight : (numeric) heighest block available
  • softforks : (array) status of softforks in progress
  • bip9_softforks : (object) status of BIP9 softforks in progress

Query UTXO set

GET /rest/getutxos/<checkmempool>/<txid>-<n>/<txid>-<n>/.../<txid>-<n>.<bin|hex|json>

The getutxo command allows querying of the UTXO set given a set of outpoints. See BIP64 for input and output serialisation: https://github.com/nixplatform/bips/blob/master/bip-0064.mediawiki

Example:

$ curl localhost:18332/rest/getutxos/checkmempool/b2cdfd7b89def827ff8af7cd9bff7627ff72e5e8b0f71210f92ea7a4000c5d75-0.json 2>/dev/null | json_pp
{
   "chainHeight" : 325347,
   "chaintipHash" : "00000000fb01a7f3745a717f8caebee056c484e6e0bfe4a9591c235bb70506fb",
   "bitmap": "1",
   "utxos" : [
      {
         "txvers" : 1
         "height" : 2147483647,
         "value" : 8.8687,		 
         "scriptPubKey" : {
            "asm" : "OP_DUP OP_HASH160 1c7cebb529b86a04c683dfa87be49de35bcf589e OP_EQUALVERIFY OP_CHECKSIG",
            "hex" : "76a9141c7cebb529b86a04c683dfa87be49de35bcf589e88ac",
            "reqSigs" : 1,
            "type" : "pubkeyhash",
            "addresses" : [
               "mi7as51dvLJsizWnTMurtRmrP8hG2m1XvD"
            ]
         }
      }
   ]
}

Memory pool

GET /rest/mempool/info.json

Returns various information about the TX mempool. Only supports JSON as output format.

  • size : (numeric) the number of transactions in the TX mempool
  • bytes : (numeric) size of the TX mempool in bytes
  • usage : (numeric) total TX mempool memory usage
  • maxmempool : (numeric) maximum memory usage for the mempool in bytes
  • mempoolminfee : (numeric) minimum feerate (BTC per KB) for tx to be accepted

GET /rest/mempool/contents.json

Returns transactions in the TX mempool. Only supports JSON as output format.

Risks

Running a web browser on the same node with a REST enabled nixd can be a risk. Accessing prepared XSS websites could read out tx/block data of your node by placing links like <script src="http://127.0.0.1:8332/rest/tx/1234567890.json"> which might break the nodes privacy.