Coin Modules

Each blockchain family lives in its own package under libs/coin-modules/coin-<family>. Package name: @ledgerhq/coin-<family>

Do not create a new coin-module if it fits the ecosystem of an existing one. No packages other than coin-modules are allowed in libs/coin-modules/.

Directory Layout

Directory / file	Purpose
api/	Coin Module API surface — implements CoinModuleApi from @ledgerhq/coin-module-framework/api/index; restricted imports apply (see below)
logic/	Core blockchain logic, agnostic of Bridge or API; only depends on network/ and external libs; restricted imports apply (see below)
network/	Communication with explorer / indexer / node; restricted imports apply (see below)
types/	Model definitions, not related to network
bridge/ (legacy)	CurrencyBridge + AccountBridge implementation
signer/ (legacy)	Hardware wallet signer interface and device address resolver

Tests: *.unit.test.ts (co-located), *.test.ts (integration, no network), *.integ.test.ts (real network, separate jest.integ.config.js).

Dependencies

Prefer native dependencies from the blockchain foundation and well-established open-source libraries. Avoid proprietary third-party SDKs or closed-source vendor packages.

In api/, logic/, and network/, the only permitted @ledgerhq/* imports are @ledgerhq/logs, @ledgerhq/live-network, @ledgerhq/coin-module-framework, and @ledgerhq/ledger-wallet-framework (enforced by eslint/no-restricted-imports in libs/coin-modules/.oxlintrc.json). Other directories (bridge/, signer/, types/) have no such restriction.

Integration Paths

1. Coin Module API path (preferred) — export createApi(config, currencyId) returning CoinModuleApi (from @ledgerhq/coin-module-framework/api/index). Enable the family in libs/ledger-live-common/src/bridge/generic-coin-framework/genericCoinFrameworkFamilies.json (checked by isGenericCoinFrameworkFamily). For methods that don't apply, throw new Error("<method> is not supported").

2. Classic JS Bridge (legacy, do not use) — export createBridges(signerContext, coinConfig) returning { currencyBridge, accountBridge }. Wired via libs/ledger-live-common/src/families/<family>/setup.ts.

Integ Test Requirements (Coin Module API)

• craftTransaction / estimateFees: cover each transaction type (token transfer, native, memo, delegation, …)
• getBalance / listOperations: cover each asset type in the module
• getBlockInfo / getBlock / listOperations / getStakes: compare against a reference block/op/stake to validate metadata parsing
• getValidators: validate metadata against a reference validator
• lastBlock: block height > 0, valid date, hash with expected length
• getNextSequence: higher than current nonce for a known account

live-common Import Rule

In libs/ledger-live-common/src, runtime imports of coin-specific code (from @ledgerhq/coin-* or ../families/*) are only allowed inside src/coin-modules/ and src/families/. All other shared code must access coin-specific behaviour through coinModuleLoaders from src/coin-modules/loaders.ts.