https://github.com/LNP-BP/rust-lnpbp/blob/95e66c5297fa0222b9a29c2e9b4fe82edeae2e49/src/chain.rs#L277 https://github.com/LNP-BP/rust-lnpbp/blob/95e66c5297fa0222b9a29c2e9b4fe82edeae2e49/src/chain.rs#L305
