1559 52296 159 31696 33 159410 29905 8 36033
157846 38468 198 25434 390 378066
145442 529177 7227

A Six-Year-Old Solc Riddle

Can we verify a piece of Ethereum antiquity by messing with the compiler?

Last October we got a request like no other, to verify the oldest NFT ever deployed on Ethereum. It was compiled using Solidity 0.1.5. That's more than 6 years old! By reverse-engineering the bytecode, and understanding the nondeterminism of the compiler (which is complex, but has to do with the memory allocator compiled into asm.js) we were able to reproduce the NFT's bytecode from source. The result allowed us to verify the contract on Etherscan and make our client happy.

Read more