Description

This PR refactors assets_state to index CIP25 and CIP68 metadata separately instead of overwriting CIP25 metadata with CIP68 metadata. This fixes incorrect behavior in the /addresses/{address}/extended endpoint, where the has_nft_onchain_metadata flag failed to reflect cases where an asset carries both CIP25 and CIP68 metadata. The refactor also simplifies how metadata is processed and resolved.

Related Issue(s)

#335

How was this tested?

• Added cip25_existence_overrides_decimals() and cip68_decimals_are_extracted_when_no_cip25() unit tests in rest_blockfrost/handlers/addresses.rs.
• Added get_asset_info_resolves_user_token_metadata_from_reference_nft() and handle_cip68_version_detection() unit tests in assets_state/src/state.rs.
• Compared responses with Blockfrost to confirm unchanged behavior for /assets/{asset} and correct behavior for /addresses/{address}/extended outside of off-chain metadata differences.
  Note: decimals currently differs from Blockfrost due to their off-chain registry dependency. Local indexing of the registry will be implemented in a future PR.

Checklist

• My code builds and passes local tests
• I added/updated tests for my changes, where applicable
• I updated documentation (if applicable)
• CI is green for this PR

Impact / Side effects

CIP25 metadata is now stored independently rather than being overwritten by CIP68 metadata.

Reviewer notes / Areas to focus

Please focus review on resolve_cip68_metadata and handle_cip68_metadata in assets_state/src/state.rs.