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Block Header.md

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53 - Block Header

Blocks contain block header, transactions and ommers’ block headers. Block header contains

  1. parentHash: The Keccak 256-bit hash of the parent block’s header, in its entirety

  2. ommersHash: The Keccak 256-bit hash of the ommers list portion of this block

  3. beneficiary: The 160-bit address to which all fees collected from the successful mining of this block be transferred

  4. stateRoot: The Keccak 256-bit hash of the root node of the state trie, after all transactions are executed and finalisations applied

  5. transactionsRoot: The Keccak 256-bit hash of the root node of the trie structure populated with each transaction in the transactions list portion of the block

  6. receiptsRoot: The Keccak 256-bit hash of the root node of the trie structure populated with the receipts of each transaction in the transactions list portion of the block

  7. logsBloom: The Bloom filter composed from indexable information (logger address and log topics) contained in each log entry from the receipt of each transaction in the transactions list

  8. difficulty: A scalar value corresponding to the difficulty level of this block. This can be calculated from the previous block’s difficulty level and the timestamp

  9. number: A scalar value equal to the number of ancestor blocks. The genesis block has a number of zero; 

  10. gasLimit: A scalar value equal to the current limit of gas expenditure per block

  11. gasUsed: A scalar value equal to the total gas used in transactions in this block

  12. timestamp: A scalar value equal to the reasonable output of Unix’s time() at this block’s inception

  13. extraData: An arbitrary byte array containing data relevant to this block. This must be 32 bytes or fewer

  14. mixHash: A 256-bit hash which, combined with the nonce, proves that a sufficient amount of computation has been carried out on this block

  15. Nonce: A 64-bit value which, combined with the mixhash, proves that a sufficient amount of computation has been carried out on this block

Slide Screenshot

053.jpg

Slide Text

  • Block -> Header, Txs, Ommers' Headers
  • Block Header -> parentHash, OmmersHash, Beneficiary address, stateRoot, - TransactionsRoot, receiptsRoot, logsBloom, difficulty, number, gasLimit, gasUsed, extraData, timestamp (unix time), mixhash, none
  • root hashes -> modified patricia-tree -> stateRoot, TransactionsRoot, receiptsRoot
  • block number -> number of blocks mined so far
  • timestamp -> time block was mined

References