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a guest Nov 17th, 2018 75 Never
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  1. pragma solidity ^0.4.21;
  2.  
  3. contract SpecialVariables {
  4.     function exec() public payable returns (
  5.         address block_coinbase,
  6.         uint256 block_difficulty,
  7.         uint256 block_gaslimit,
  8.         uint256 block_number,
  9.         uint256 block_timestamp,
  10.         uint256 gas_left,
  11.         bytes msg_data,
  12.         address msg_sender,
  13.         bytes4 msg_sig,
  14.         uint256 msg_value,
  15.         uint256 tx_gasprice,
  16.         address tx_origin
  17.     ) {
  18.         block_coinbase = block.coinbase; // current block miner’s address
  19.         block_difficulty = block.difficulty; // current block difficulty  
  20.         block_gaslimit = block.gaslimit; // current block gaslimit
  21.         block_number = block.number; // current block number
  22.         block_timestamp = block.timestamp; // current block timestamp as seconds since unix epoch
  23.         gas_left = gasleft(); // remaining gas
  24.         msg_data = msg.data; // complete calldata
  25.         msg_sender = msg.sender; // sender of the message (current call)
  26.         msg_sig = msg.sig; // first four bytes of the calldata (i.e. function identifier)
  27.         msg_value = msg.value; // number of wei sent with the message
  28.         tx_gasprice = tx.gasprice; // gas price of the transaction
  29.         tx_origin = tx.origin; // sender of the transaction (full call chain)
  30.     }
  31.    
  32.     function getBlockhash(uint256 blockNumber) public view returns (bytes32) {
  33.         /// hash of the given block - only works for 256 most recent,
  34.         /// excluding current, blocks - deprecated in version 0.4.22
  35.         /// and replaced by blockhash(uint blockNumber).
  36.         return blockhash(blockNumber);
  37.     }
  38. }
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