Thanks for the excellent contribution, @sumanjeet0012!

This is another valuable improvement that simplifies the implementation while making py-cid more standards-compliant and future-proof. Replacing the hardcoded multihash mappings with the python-multihash APIs is the right design choice, as it removes duplicated logic and makes the library rely on the canonical source of truth for supported multihash codes and names.

This not only resolves the immediate issue with algorithms such as identity, shake-256, and blake3, but also ensures that newly supported multihash functions can be handled without requiring manual updates to py-cid. I also appreciate that both the forward and reverse mappings now consistently delegate to the multihash library, resulting in cleaner, more maintainable code with less room for inconsistencies over time.

With the linting fixes included and the full CI matrix passing successfully across all supported environments, this change looks solid. Overall, this improves interoperability across the multiformats ecosystem while reducing maintenance burden. LGTM, thanks for the thoughtful implementation and happy to merge.

CCing @acul71, @johannamoran, @mishmosh.