The Inter-Blockchain Communication Protocol (IBC) project repository serves as the authoritative resource for the development and documentation of IBC, a pivotal protocol facilitating secured cross-chain communication. It consolidates design rationales, protocol semantics, and encoding descriptions, addressing both the core transport, authentication, and ordering layer (IBC/TAO) and the application layers related to packet encoding and processing semantics (IBC/APP). The repository includes interchain standards at various stages of development, from draft to finalized, with implementations spanning multiple clients and relayer algorithms. Open to contributions, the project underscores the collaborative effort necessary to advance interoperability in blockchain networks.