pub const EIP1967_IMPL_SLOT: &str = "0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc";
EIP-1967 implementation slot: keccak256("eip1967.proxy.implementation") - 1
keccak256("eip1967.proxy.implementation") - 1