April 2017
Intermediate to advanced
266 pages
7h 4m
English
Content preview from Building Blockchain Projects
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Block and transaction properties
The block and transaction properties are as follows:
- block.blockhash(uint blockNumber) returns (bytes32): The hash of the given block only works for the 256 most recent blocks.
- block.coinbase (address): The current block miner's address.
- block.difficulty (uint): The current block difficulty.
- block.gaslimit (uint): The current block gas limit. It defines the maximum amount of gas that all transactions in the whole block combined are allowed to consume. Its purpose is to keep the block propagation and processing time low, thereby allowing a sufficiently decentralized network. Miners have the right to set the gas limit for the current block to be within ~0.0975% (1/1,024) of the gas limit of the last block, ...