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Blocks

Block Operations

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)

Example: Refer to Get Block example.

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)

Example: Refer to Get Block Id example.

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)

Example: Refer to Get Blocks example.

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)

Example: Refer to Get EC Block example.