Blockchain RPCs

getbestblockhash

Returns the hash of the best (tip) block in the most-work fully-validated chain.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{"jsonrpc": "1.0", "id": "curltest", "method": "getbestblockhash", "params": []}

Example response: 200

{
    "result": "000000000000001e41c5a08fc1e0177f42e60c6ceff8fd746c900bed85585eb0",
    "error": null,
    "id": "curltest"
}

getblock

If verbosity is 0, returns a string that is serialized, hex-encoded data for block ‘hash’.

If verbosity is 1, returns an Object with information about block ‘hash’. If verbosity is 2, returns an Object with information about block ‘hash’ and information about each transaction.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblock",
    "params": [
        "000000000000001e41c5a08fc1e0177f42e60c6ceff8fd746c900bed85585eb0"
    ]
}

Example response: 200

{
    "result": {
        "hash": "000000000000001e41c5a08fc1e0177f42e60c6ceff8fd746c900bed85585eb0",
        "confirmations": 1,
        "height": 2585857,
        "version": 547356672,
        "versionHex": "20a00000",
        "merkleroot": "cce9a161dc46d8c8f71764fe8fdb366efc909bf51cad41437763f14bb58b39f1",
        "time": 1712757644,
        "mediantime": 1712755070,
        "nonce": 974427767,
        "bits": "1926e250",
        "difficulty": 110454122.3273832,
        "chainwork": "000000000000000000000000000000000000000000000d68384698bd06ac3330",
        "nTx": 493,
        "previousblockhash": "00000000000000149fc5450d35384d1238e72d9271155d606b45f479a7cba56b",
        "strippedsize": 61265,
        "size": 139352,
        "weight": 323147,
        "tx": [
            "3c50a7a5445ca47ba982b93cd95ab974b7dc008802050bfc43925c49a4032cdc",
            "b75ac6bfb370f2055303a201009fbf85f52abfc295d7a4c15d14d31c8059c962",
            "4fbfc35cc2fc23e7ecc47ff828e7c4aee930b16f8613b3914389554cbc0b404b",
            "84fcfd018fac1c8485713f6e19537fa53a9548c08d81b92be1a10cc61ff30b0f",
            "62a394b66f45eccc71575ba5d8d5377279ad3b0a38b76a1d5eb57c9b1ad37d87",
            "5f69d4a8788906457a9838f6cf3877702d19cd8281331c2e0d0ceadcd132382c",
            "d321f0467587cce0d35bc51135af756193e0e36c7a5194f7b7f9bb38f95ad9e1",
            "dab89af9917c6424d461ec763e1c210d6eb070e02487cc08522ee98099bdd039",
            "4a6dcc53219d85d2c19b337314d43145a33dfba763c6339a3abd1e74490bc33f",
            "12fb09ee25db17742259f30dc1492162224db18afd605c5e300c1f89a628415a",
            "a036d89acb7669e4d9545d2c8272193a29c9aeffea6966552dace755d1c80fce",
            "ec2e5745cacf0aed986c25350798a605c6f17c19ff3f168bcedb1002840a2568",
            "64f29f8e7788477047ebf0f4b33672e27a58cddb9e83b5a0504d80e91f9960b4",
            "088c500efb40e3410364262ad11d8b93b866f57859653536ac815dd0bc005196",
            "45d2b5b676a42565f35739fc1d6745fc2f282404e21013fad2a2856d06c37dff",
            "1cbd3ea053ff881f9493480bda16a7a9b8df2c609d3767c4d8b9ac4eda66aab4",
            "ae3d88badeec76fddb8f86fff742121d2dd8b08592362e8a1872a319e38bbb70",
            "212a99b5bda54d819da1c9a0cea921b3ae66452723d4294ead7acfdcf54a64c3",
            "b55a1672f3c6afa10e2bac62c69f5607df6065dd6d25225378cff9a49ff9d5e6",
            "fe402fcf7ff2a2b245f9f84776668c6eb205bf95b4578411c87b25c4dbc437c7",
            "caf5482cdad8d863603741727503a1aa55d165c5255395c1d3fa4a93e68ba6f8",
            "1861db8e61390c491aaf876c42803907ded3f42e1f7c7ddcc3e3d05308f039d9",
            "3a6462cf4a93345d6528699ef0e22a3cc93d0a43969619e69dc211f6ad8be033",
            "1194a31eaab27f958a17c346ab884d938f8b8637826608527f53bbfefd2854de",
            "11eb64ecf6baf41b2360465fa8b8dc97e8608be5d9a8ce9449133c5c7f6f8b83",
            "a9b5d0805b9ca6d8be30c444dafe8456bb36cd6696eadb34f1d99c2449cbaf25",
            "a8e57a62b9728d9dd4da7ef16522dcc9c1b3628e34b0f51f4021e3d666010d9a",
            "1cd66788f4b1c07f1f5a39b92d63233f39999567472de0079626b1f2ffa77ce3",
            "8b6d665253ff8a4fc1d328ef88e90584450e68f0fa871b8cf36311336a8cbbc0",
            "4b136d8a914526b74b56bf3207558d4613b1cb058fdf1df2f6e6ad3f8a7c2085",
...

getblockchaininfo

Returns an object containing various state info regarding blockchain processing.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockchaininfo",
    "params": []
}

Example response: 200

{
    "result": {
        "chain": "test",
        "blocks": 2585857,
        "headers": 2585857,
        "bestblockhash": "000000000000001e41c5a08fc1e0177f42e60c6ceff8fd746c900bed85585eb0",
        "difficulty": 110454122.3273832,
        "time": 1712757644,
        "mediantime": 1712755070,
        "verificationprogress": 0.9999986842687764,
        "initialblockdownload": false,
        "chainwork": "000000000000000000000000000000000000000000000d68384698bd06ac3330",
        "size_on_disk": 37088221416,
        "pruned": false,
        "warnings": "Unknown new rules activated (versionbit 28)"
    },
    "error": null,
    "id": "curltest"
}

getblockcount

Returns the height of the most-work fully-validated chain.

The genesis block has height 0.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockcount",
    "params": []
}

Example response: 200

{
    "result": 2585857,
    "error": null,
    "id": "curltest"
}

getblockfilter

Retrieve a BIP 157 content filter for a particular block.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockfilter",
    "params": [
        "00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09",
        "basic"
    ]
}

Example response: 200

{
    "result": null,
    "error": {
        "code": -1,
        "message": "Index is not enabled for filtertype basic"
    },
    "id": "curltest"
}

getblockhash

Returns hash of block in best-block-chain at height provided.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockhash",
    "params": [
        1000
    ]
}

Example response: 200

{
    "result": "00000000373403049c5fff2cd653590e8cbe6f7ac639db270e7d1a7503d698df",
    "error": null,
    "id": "curltest"
}

getblockheader

If verbose is false, returns a string that is serialized, hex-encoded data for blockheader ‘hash’.

If verbose is true, returns an Object with information about blockheader ‘hash’.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockheader",
    "params": [
        "000000000000001e41c5a08fc1e0177f42e60c6ceff8fd746c900bed85585eb0"
    ]
}

Example response: 200

{
    "result": {
        "hash": "000000000000001e41c5a08fc1e0177f42e60c6ceff8fd746c900bed85585eb0",
        "confirmations": 1,
        "height": 2585857,
        "version": 547356672,
        "versionHex": "20a00000",
        "merkleroot": "cce9a161dc46d8c8f71764fe8fdb366efc909bf51cad41437763f14bb58b39f1",
        "time": 1712757644,
        "mediantime": 1712755070,
        "nonce": 974427767,
        "bits": "1926e250",
        "difficulty": 110454122.3273832,
        "chainwork": "000000000000000000000000000000000000000000000d68384698bd06ac3330",
        "nTx": 493,
        "previousblockhash": "00000000000000149fc5450d35384d1238e72d9271155d606b45f479a7cba56b"
    },
    "error": null,
    "id": "curltest"
}

getblockstats

Compute per block statistics for a given window. All amounts are in satoshis.

It won’t work for some heights with pruning.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockstats",
    "params": [
        1000,
        [
            "minfeerate",
            "avgfeerate"
        ]
    ]
}

Example response: 200

{
    "result": {
        "avgfeerate": 0,
        "minfeerate": 0
    },
    "error": null,
    "id": "curltest"
}

getchaintips

Return information about all known tips in the block tree, including the main chain as well as orphaned branches.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getchaintips",
    "params": []
}

Example response: 200

{
    "result": [
        {
            "height": 2585858,
            "hash": "000000000000001e7c9c1c0c87b7b6ae98176df9c1faa4f09dc571bc70e00a31",
            "branchlen": 0,
            "status": "active"
        },
        {
            "height": 2585505,
            "hash": "000000000015aa72dfef49de344f672e749fc3a2336eddeb135ac2cbf3268042",
            "branchlen": 1,
            "status": "valid-fork"
        },
        {
            "height": 2585263,
            "hash": "0000000000004e8e0040a61b16884cfe1fdb12eb1b1877eed0bce22791af9bc8",
            "branchlen": 1,
            "status": "valid-fork"
        },
        {
            "height": 2584935,
            "hash": "00000000000035d77d5afa18467f7a443b19f2486da765c2d38dc2925ace7f58",
            "branchlen": 2,
            "status": "valid-fork"
        },
        {
            "height": 2584132,
            "hash": "00000000000fa96495a47b31cdcb76d728d9bd1ea2b30d439dc0953296afdeab",
            "branchlen": 1,
            "status": "valid-fork"
        },
        {
            "height": 2582802,
            "hash": "00000000008bb8d8cd04c95d1b479b349dddc8eb91568cf8108e1e188b37bd77",
            "branchlen": 1,
            "status": "valid-fork"
        },
        {
            "height": 2582753,
            "hash": "00000000007917c0252b1983228bcb928bde41370a6692a2568d0ddb0bd9fbe8",
            "branchlen": 2,
            "status": "valid-fork"
        },
        {
            "height": 2582645,
            "hash": "0000000000e714e4b1a4e48c9fe3aa93929fe8b6d2ab801f8952dddf3c21c75f",
            "branchlen": 1,
            "status": "valid-headers"
        },
        {
            "height": 2582448,
            "hash": "0000000000ca775f2aed3a8adedc0f2e28ddb30d625f66dc9e1efbba6a5c23a3",
            "branchlen": 1,
            "status": "valid-fork"
        },
...

getchaintxstats

Compute statistics about the total number and rate of transactions in the chain.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getchaintxstats",
    "params": [
        2016
    ]
}

Example response: 200

{
    "result": {
        "time": 1712758452,
        "txcount": 75724625,
        "window_final_block_hash": "000000000000001e7c9c1c0c87b7b6ae98176df9c1faa4f09dc571bc70e00a31",
        "window_final_block_height": 2585858,
        "window_block_count": 2016,
        "window_tx_count": 820911,
        "window_interval": 1205517,
        "txrate": 0.6809617782246123
    },
    "error": null,
    "id": "curltest"
}

getdifficulty

Returns the proof-of-work difficulty as a multiple of the minimum difficulty.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getdifficulty",
    "params": []
}

Example response: 200

{
    "result": 110454122.3273832,
    "error": null,
    "id": "curltest"
}

getmempoolancestors

If txid is in the mempool, returns all in-mempool ancestors.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempoolancestors",
    "params": [
        "mytxid"
    ]
}

Example response: 200

{
    "result": null,
    "error": {
        "code": -8,
        "message": "parameter 1 must be of length 64 (not 6, for 'mytxid')"
    },
    "id": "curltest"
}

getmempooldescendants

If txid is in the mempool, returns all in-mempool descendants.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempooldescendants",
    "params": [
        "mytxid"
    ]
}

Example response: 200

{
    "result": null,
    "error": {
        "code": -8,
        "message": "parameter 1 must be of length 64 (not 6, for 'mytxid')"
    },
    "id": "curltest"
}

getmempoolentry

Returns mempool data for given transaction

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempoolentry",
    "params": [
        "mytxid"
    ]
}

Example response: 200

{
    "result": null,
    "error": {
        "code": -8,
        "message": "parameter 1 must be of length 64 (not 6, for 'mytxid')"
    },
    "id": "curltest"
}

getmempoolinfo

Returns details on the active state of the TX memory pool.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempoolinfo",
    "params": []
}

Example response: 200

{
    "result": {
        "loaded": true,
        "size": 1099,
        "bytes": 185113,
        "usage": 1572688,
        "total_fee": 0.01518901,
        "maxmempool": 2000000000,
        "mempoolminfee": 0.00001000,
        "minrelaytxfee": 0.00001000,
        "incrementalrelayfee": 0.00001000,
        "unbroadcastcount": 0,
        "fullrbf": false
    },
    "error": null,
    "id": "curltest"
}

getrawmempool

Returns all transaction ids in memory pool as a json array of string transaction ids.

Hint: use getmempoolentry to fetch a specific transaction from the mempool.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getrawmempool",
    "params": [
        true
    ]
}

Example response: 200

{
    "result": {
        "87708ccea544674bbe25dff7746229e72487c5c04f0af2ddefe7c1a0a7b59158": {
            "vsize": 225,
            "weight": 900,
            "time": 1712758589,
            "height": 2585858,
            "descendantcount": 1,
            "descendantsize": 225,
            "ancestorcount": 1,
            "ancestorsize": 225,
            "wtxid": "87708ccea544674bbe25dff7746229e72487c5c04f0af2ddefe7c1a0a7b59158",
            "fees": {
                "base": 0.00060000,
                "modified": 0.00060000,
                "ancestor": 0.00060000,
                "descendant": 0.00060000
            },
            "depends": [],
            "spentby": [],
            "bip125-replaceable": false,
            "unbroadcast": false
        },
        "90eca835459b5a28aa4ec8a8c81f9b0ff638d6ba38afbc9c79615d7631579014": {
            "vsize": 164,
            "weight": 654,
            "time": 1712758460,
            "height": 2585858,
            "descendantcount": 1,
            "descendantsize": 164,
            "ancestorcount": 1,
            "ancestorsize": 164,
            "wtxid": "b9e6a2ad234b9925bb04bbbe9992f5538630fa144b3549cc2fbaf75b8877fc68",
            "fees": {
                "base": 0.00014904,
                "modified": 0.00014904,
                "ancestor": 0.00014904,
                "descendant": 0.00014904
            },
            "depends": [],
            "spentby": [],
            "bip125-replaceable": true,
            "unbroadcast": false
        },
        "0d54a21f580ad3af8574bd028caeacfe62de6d5129a009a031359e4844336dd3": {
            "vsize": 154,
            "weight": 616,
            "time": 1712758533,
            "height": 2585858,
            "descendantcount": 2,
            "descendantsize": 318,
            "ancestorcount": 1,
            "ancestorsize": 154,
            "wtxid": "4ea15b527ce5775d9c7c2085e28a4f5c6593378646616bdcea869d4238c6b066",
            "fees": {
                "base": 0.00010626,
                "modified": 0.00010626,
                "ancestor": 0.00010626,
                "descendant": 0.00025530
            },
            "depends": [],
            "spentby": [
                "e0b7e0ed52e1fc93613c939f1e37783991b0d46598a6c87f966fd3365653ff84"
            ],
            "bip125-replaceable": false,
            "unbroadcast": false
        },
...

gettxout

Returns details about an unspent transaction output.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "gettxout",
    "params": [
        "txid",
        1
    ]
}

Example response: 200

{
    "result": null,
    "error": {
        "code": -8,
        "message": "txid must be of length 64 (not 4, for 'txid')"
    },
    "id": "curltest"
}

gettxoutproof

Returns a hex-encoded proof that “txid” was included in a block.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "gettxoutproof",
    "params": [
        [
            "3c50a7a5445ca47ba982b93cd95ab974b7dc008802050bfc43925c49a4032cdc",
            "b75ac6bfb370f2055303a201009fbf85f52abfc295d7a4c15d14d31c8059c962"
        ],
        null
    ]
}

Example response: 200

{
    "result": "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",
    "error": null,
    "id": "curltest"
}

gettxoutsetinfo

Returns statistics about the unspent transaction output set.

Note this call may take some time.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{"jsonrpc": "1.0", "id": "curltest", "method": "gettxoutsetinfo", "params": []}

Example response: 200

{
    "result": {
        "height": 2585858,
        "bestblock": "000000000000001e7c9c1c0c87b7b6ae98176df9c1faa4f09dc571bc70e00a31",
        "txouts": 38855987,
        "bogosize": 2919211905,
        "hash_serialized_3": "784594fc723b039f05347e8dad17cc28d13e8f5c72b15bdef55bea7eb5b0751a",
        "total_amount": 20994788.28571239,
        "transactions": 18446595,
        "disk_size": 2268992765
    },
    "error": null,
    "id": "curltest"
}

preciousblock

Treats a block as if it were received before others with the same work.

A later preciousblock call can override the effect of an earlier one.

The effects of preciousblock are not retained across restarts.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "preciousblock",
    "params": [
        "blockhash"
    ]
}

Example response: 200

{
    "result": null,
    "error": {
        "code": -8,
        "message": "blockhash must be of length 64 (not 9, for 'blockhash')"
    },
    "id": "curltest"
}

savemempool

Dumps the mempool to disk. It will fail until the previous dump is fully loaded.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "savemempool",
    "params": []
}

Example response: 200

{
    "result": {
        "filename": "/coin/data/testnet3/mempool.dat"
    },
    "error": null,
    "id": "curltest"
}

verifychain

Verifies blockchain database.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "verifychain",
    "params": []
}

Example response: 200

{
    "result": true,
    "error": null,
    "id": "curltest"
}

estimatesmartfee

Estimates the smart fee per kilobyte to be paid for a transaction and also returns the number of blocks for which the estimate is valid.

Method: POST

https://btc-testnet.nownodes.io

Example body (raw)

{
    "method": "estimatesmartfee",
    "params": [
        10
    ]
}

Example response: 200

{
    "result": {
        "feerate": 0.05531357,
        "blocks": 10
    },
    "error": null,
    "id": null
}