[WIP] Follow EIP1559
to calculate correct transaction gas price
#76
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This PR aims to add the missing block constant functionality of
Instruction
and implementEIP1559
onBeginTx
.Currently the block constant can be used directly, just like using the copy constraint in halo2. But the opcode
BLOCKHASH
requires to access up to previous 256 block hashes, which would be expensive to copy 256 value at each step. See more discussion on #75.