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Block

What is a block?

Block: A data structure that describes and authorizes the execution of a batch of transactions (state transitions) on the blockchain.

Blockchain: A broad term that can refer to:

  • The canonical sequence or 'chain' of blocks and the raw data directly available in this sequence, for example: block hashes, transactions, and events.
  • The above, but further including data that is derivable from raw block data. This includes, most prominently, the world state.
  • The network of full nodes and clients that maintain the correctness and consistency of the blockchain data structure.

What's in a block?

  • App ID - Id of the blockchain
  • Block Hash - Block hash of this block
  • Height - Identifier for a height of a block on the blockchain encoded as a number
  • Justify - Quorum Certificate
  • Data Hash - Hash over Data
  • Version number - Identifier for the set of block validation rules for the blockchain
  • Timestamp - Unix timestamp (number of seconds since 1970-01-01)
  • Transaction Trie root hash - Merkle Tree root hash of transactions
  • State root hash - Merkle Tree root hash of current world-state
  • Receipt Trie root hash - Merkle Tree root hash of receipts
  • Transactions - the transactions included in the block
  • Receipts - the execution result of transactions which are included in the block
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