See [`#Regtest`](https://github.com/Benjamin-Loison/Internet-Computer-Bitcoin-Library/blob/d4e6ba70c1baa5e17524f0af1c2ca03e3694bc28/motoko/src/Types.mo#L30), [`build.rs`](https://github.com/Benjamin-Loison/Internet-Computer-Bitcoin-Library/blob/507c8dc04db9b4f10f9f09e217d1cd1087857591/rust/build.rs) and [`types.rs`](https://github.com/Benjamin-Loison/Internet-Computer-Bitcoin-Library/blob/507c8dc04db9b4f10f9f09e217d1cd1087857591/rust/src/types.rs#L21-L22).
See
#Regtest,build.rsandtypes.rs.