71 - Block Information

Information about the Transaction's Block

OP Code (Hexidecimal)	Operation¹	Description	Gas
0x40	BLOCKHASH 1 1	Get the hash of one of the 256 most recent complete blocks²	20
0x41	COINBASE 0 1	Get the block’s beneficiary address	2
0x42	TIMESTAMP 0 1	Get the block’s timestamp	2
0x43	NUMBER 0 1	Get the block’s number	2
0x44	DIFFICULTY 0 1	Get the block’s difficulty	2
0x45	GASLIMIT 0 1	Get the block’s gas limit	2

References

(Mnemonic, Stack items placed, Stack items removed) ↩
Can have security implications if the block requested is not in the most recent 256 blocks because it can return 0. ↩