Blocks

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Get Block

Get a block object given a block ID or block height.

Request:

  • requestType is getBlock
  • block is the block ID (optional)
  • height is the block height (optional if block provided)
  • timestamp is the timestamp (in seconds since the genesis block) of the block (optional if height provided)
  • includeTransactions is true to include transaction details (optional)
  • includeExecutedPhased is true to include approved and executed phased transactions (optional)
  • requireBlock is the block ID of a block that must be present in the blockchain during execution (optional)
  • requireLastBlock is the block ID of a block that must be last in the blockchain during execution (optional)

Note: block overrides height which overrides timestamp.

Response:

  • previousBlockHash (S) is the 32-byte hash of the previous block
  • payloadLength (N) is the length (in bytes) of all transactions included in the block
  • totalAmountNQT (S) is the total amount (in NQT) of the transactions in the block
  • generationSignature (S) is the 32-byte generation signature of the generating account
  • generator (S) is the generating account number
  • generatorPublicKey (S) is the 32-byte public key of the generating account
  • baseTarget (S) is the base target for the next block generation
  • payloadHash (S) is the 32-byte hash of the payload (all transactions)
  • generatorRS (S) is the Reed-Solomon address of the generating account
  • nextBlock (S) is the next block ID
  • numberOfTransactions (N) is the number of transactions in the block
  • blockSignature (S) is the 64-byte block signature
  • transactions (A) is an array of transaction IDs or transaction objects (if includeTransactions provided, refer to Get Transaction for details)
  • executedPhasedTransactions (A) is an array of transaction IDs or transaction objects (if includeExecutedPhased provided, refer to Get Transaction for details)
  • version (N) is the block version
  • totalFeeNQT (S) is the total fee (in NQT) of the transactions in the block
  • previousBlock (S) is the previous block ID
  • cumulativeDifficulty (S) is the cumulative difficulty for the next block generation
  • block (S) is the block ID
  • height (N) is the zero-based block height
  • timestamp (N) is the timestamp (in seconds since the genesis block) of the block
  • lastBlock (S) is the last block ID on the blockchain (applies if requireBlock is provided but not requireLastBlock)
  • requestProcessingTime (N) is the API request processing time (in millisec)

Get Block Example

Request

Test request
http://localhost:7876/nxt?
  requestType=getBlock&
  block=8455642159445842600

Response 

{
 "previousBlockHash": "c0574d7a7b8497373dbead497c2dc7f60fdcfc8c5a9fcb48f7d373acc9bbb099",
 "payloadLength": 1189,
 "totalAmountNQT": "100000000",
 "generationSignature": "c5098d37267bc71134fc8572a87b4af8727a2e5139d60fe8833fab98af22244a",
 "generator": "11693867635361772359",
 "generatorPublicKey": "fbb72a280228af5c8c74c7c754a290e1539f839553c00bc560cac7bfdb324a7c",
 "baseTarget": "1530224444",
 "payloadHash": "633992be640a593ba04e31ca4028deed70bbf47cff333e2a0372a4e2a4aba205",
 "generatorRS": "NXT-TWU9-P3E4-HCDM-CQ9L6",
 "nextBlock": "5937170741469897491",
 "requestProcessingTime": 175,
 "numberOfTransactions": 6,
 "blockSignature": "ff65a82e385c135cf9bd5be0861e9e5d3d3174fbd993e5b7f57935ec4...",
 "transactions": [
  "15184285173972564233",
  "15200280108574630445",
  "15200507403046301754",
  "15900338016714606285",
  "17881859777840687131",
  "18361738217269620028"
 ],
 "version": 3,
 "totalFeeNQT": "600000000",
 "previousBlock": "4005816059437078464",
 "cumulativeDifficulty": "10229109959119715",
 "block": "8455642159445842600",
 "height": 275730,
 "timestamp": 29797208
}


Get Block Id

Get a block ID given a block height.

Request:

  • requestType is getBlockId
  • height is the block height
  • requireBlock is the block ID of a block that must be present in the blockchain during execution (optional)
  • requireLastBlock is the block ID of a block that must be last in the blockchain during execution (optional)

Response:

  • block (S) is the block ID
  • lastBlock (S) is the last block ID on the blockchain (applies if requireBlock is provided but not requireLastBlock)
  • requestProcessingTime (N) is the API request processing time (in millisec)

Get Block Id Example

Request

Test request
http://localhost:7876/nxt?
  requestType=getBlockId&
  height=0

Response 

{
 "block": "2680262203532249785",
 "requestProcessingTime": 1
}


Get Blocks

Get blocks from the blockchain in reverse block height order.

Request:

  • requestType is getBlocks
  • timestamp is the earliest block (in seconds since the genesis block) to retrieve (optional)
  • firstIndex is first block to retrieve (optional, default is zero or the last block on the blockchain)
  • lastIndex is the last block to retrieve (optional, default is firstIndex + 99)
  • includeTransactions is true to include transaction details (optional)
  • includeExecutedPhased is true to include approved and executed phased transactions (optional)
  • requireBlock is the block ID of a block that must be present in the blockchain during execution (optional)
  • requireLastBlock is the block ID of a block that must be last in the blockchain during execution (optional)

Response:

  • blocks (A) is an array of blocks retrieved (refer to Get Block for details)
  • lastBlock (S) is the last block ID on the blockchain (applies if requireBlock is provided but not requireLastBlock)
  • requestProcessingTime (N) is the API request processing time (in millisec)

Get Blocks Example

Request

Test request
http://localhost:7876/nxt?
  requestType=getBlocks&
  lastIndex=1

Response 

{
 "blocks": [
  {
   "previousBlockHash": "f88c75a36317e1795348330cb9a944f33153b517ebdf05d9f3f9a606e997618d",
   "payloadLength": 981,
   "totalAmountNQT": "0",
   "generationSignature": "02f7462b62270c0028c379d838d3a192cf0b782995f3bb1929a5378d26e7e8a9",
   "generator": "2218289317977832095",
   "generatorPublicKey": "98ccf5d5173b13e4c9eab2631372f61ce8ba506db559d73b285073a689872e75",
   "baseTarget": "151761236",
   "payloadHash": "82f8c8ca1f8f2252172ed1e9836d5228432fcb18aecfa7d55a119efcd242321c",
   "generatorRS": "NXT-TGNZ-E8VK-69EX-3L9LX",
   "numberOfTransactions": 5,
   "blockSignature": "76a3f7f966256c4985262fb4622190b2b9a19b900f6ce443ab7d581e3176c...",
   "transactions": [
    "10545999940082849455",
    "16751328983055099280",
    "1257496316971695605",
    "2048859884870801838",
    "5105170273384355243"
   ],
   "version": 3,
   "totalFeeNQT": "500000000",
   "previousBlock": "8782326465060769016",
   "block": "7299310714263322546",
   "height": 281683,
   "timestamp": 30416681
  },
  {
   "previousBlockHash": "edc2d65d24883b9b32c46da4eec3792a69a5ff9a9b1e629c4e7e0224432c87c9",
   "payloadLength": 0,
   "totalAmountNQT": "0",
   "generationSignature": "8c4944c7a9ef5700d1b89660fdf83bcbd3dbbfbe191fef005d0f248a573816fe",
   "generator": "15766845356521829337",
   "generatorPublicKey": "11636697faf4ade736cedf6c528bec0142353c4d93fce05cdb818c49e0390422",
   "baseTarget": "303522472",
   "payloadHash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
   "generatorRS": "NXT-2EYT-C522-VL6G-FQSMP",
   "nextBlock": "7299310714263322546",
   "numberOfTransactions": 0,
   "blockSignature": "90464d183ed01cb0930ef527e746eaa092d1558697c369cc9246add5f6eec...",
   "transactions": [],
   "version": 3,
   "totalFeeNQT": "0",
   "previousBlock": "11185683789279314669",
   "block": "8782326465060769016",
   "height": 281682,
   "timestamp": 30416671
  }
 ],
 "requestProcessingTime": 2
}


Get EC Block

Get Economic Cluster block data.

Request:

  • requestType is getECBlock
  • timestamp is the timestamp (in seconds since the genesis block) of the EC block (optional, default (or zero) is the current timestamp)
  • requireBlock is the block ID of a block that must be present in the blockchain during execution (optional)
  • requireLastBlock is the block ID of a block that must be last in the blockchain during execution (optional)

Note: If timestamp is more than 15 seconds before the timestamp of the last block on the blockchain, errorCode 4 is returned.

Response:

  • ecBlockHeight (N) is the EC block height
  • ecBlockId (S) is the EC block ID
  • timestamp (N) is the timestamp (in seconds since the genesis block) of the EC block
  • lastBlock (S) is the last block ID on the blockchain (applies if requireBlock is provided but not requireLastBlock)
  • requestProcessingTime (N) is the API request processing time (in millisec)

Get EC Block Example

Request

Test request
http://localhost:7876/nxt?
  requestType=getECBlock

Response 

{
 "ecBlockHeight": 281777,
 "requestProcessingTime": 2,
 "ecBlockId": "6565813579609649593",
 "timestamp": 30427868
}
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