etk-4byte

Ethereum function selector reverse lookup database, populated from 4byte.directory.

Updating the Database

Since etk-4byte is a purely offline database, it needs regular updates. To fetch the latest database and convert it to the expected format, run:

$ cargo run --features=generate --bin etk-4byte-generate > src/signatures.txt
$ cargo run --features=generate --bin etk-4byte-pack

Then recompile.

lib.rs:

EVM Toolkit Function Selector Database.

To roughly quote 4byte.directory:

Function calls in the Ethereum Virtual Machine are specified by the first four bytes of data sent with a transaction. These function selectors are defined as the first four bytes of the Keccak-256 hash of the canonical representation of the function signature. Since this is a one-way operation, it is not possible to derive the human-readable representation of the function (signature) from the four byte selector. This database is meant to allow mapping those bytes signatures back to their human-readable versions.