feat(cardano): add Cardano chain support (Gateway) + Mithril-based 08-cardano light client#4429

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floor-licker wants to merge 57 commits intoinformalsystems:masterfrom

webisoftSoftware:feat/cardano-integration

Commits on Dec 3, 2025

feat: initialize Cardano integration in Hermes fork
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fix: resolve import errors and ChainEndpoint method signatures
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fix: correct CrossChainQueryRequest import path and expand request imports
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feat: implement SigningKeyPair trait for CardanoSigningKeyPair
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feat: implement ConsensusState and ClientState traits for Cardano types
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feat: add stub From trait implementations and fix remaining compilation issues
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fix: resolve all compilation errors achieving clean build, fixing Error config calls to use ConfigError wrong_type, fixing KeyringError constructors to use invalid_mnemonic and key_not_found, fixin…
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feat: add Cardano chain configuration to Hermes, creating CardanoConfig in ibc-relayer/src/chain/cardano/config.rs, adding Cardano variant to ChainConfig enum, updating all ChainConfig match statem…
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feat: implement bootstrap method for CardanoChainEndpoint, extracting Cardano-specific config from ChainConfig enum, initializing Gateway gRPC client with async connection to gateway URL, setting u…
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feat: implement core query methods and keyring integration for CardanoChainEndpoint, implementing query_application_status to retrieve latest chain height and timestamp from Gateway, implementing q…
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Commits on Dec 4, 2025

feat: document Cardano chain integration architecture and circular dependency resolution, adding detailed documentation in cardano module explaining why CardanoChainEndpoint cannot be directly impo…
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Commits on Dec 5, 2025

Commits on Dec 8, 2025

refactor: rename cardano-testnet to cardano-devnet to accurately reflect local development network
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Commits on Dec 10, 2025

Commits on Jan 13, 2026

fix: resolve Hermes transaction signing for Conway-era Cardano transactions by updating CBOR encoding, adding bech32 private key support to bypass mnemonic derivation incompatibility, and fixing ke…
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Commits on Jan 14, 2026

Commits on Jan 15, 2026

feat: add channel close and timeout-on-close support in Cardano endpoint by implementing event parsing for timeout_on_close_packet events with unit tests, adding Gateway client handlers for MsgChan…
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Commits on Jan 30, 2026

Commits on Feb 3, 2026

fix: support MsgTransfer for Cardano tx building
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Commits on Feb 4, 2026

fix(cardano): correct enterprise address derivation
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Commits on Feb 11, 2026

fix(cardano): unblock handshake and parse packet data bytes
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Commits on Feb 13, 2026

fix(cardano): accept no-timeout packet height in events
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