OTP-003: Self-ABI reporting

This proposal defines how to report the contract's ABI using the IPFS link.

Motivation

Usually, ABI is supplied separately using a third-party service or via some repository on GitHub. This proposal suggests adding a new self-reporting of the contract's ABI using a link to an IPFS. This would allow us to avoid any third-party dependency and allow anyone to build tools that rely on ABI such as explorers, wallets, etc.

Specification

To support this proposal, the contract should implement OTP-001 and report an interface org.ton.abi.ipfs.v0. Then implement a get method get_abi_ipfs that returns a string with an IPFS link to the ABI file. The link should be in the format ipfs://<hash>.

Drawbacks

• No way to upgrade ABI without updating a contract. This is a drawback exists only for hardcoded links.