Solidity Programming Essentials

Transaction and message global variables

The following is a list of global variables along with their data types and a description provided as a ready reference:

Variable name	Description
block.coinbase (address)	Same as etherbase. Refers to the miner's address.
block.difficulty (uint)	Difficulty level of current block.
block.gaslimit (uint)	Gas limit for current block.
block.number (uint)	Block number in sequence.
block.timestamp (uint)	Time when block was created.
msg.data (bytes)	Information about the function and its parameters that created the transaction.
msg.gas (uint)	Gas unused after execution of transaction.
msg.sender (address)	Address of caller who invoked the function.