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@ldgr/protocol

v0.5.0

Published

`@ldgr/protocol` contains the versioned, pure protocol primitives shared by LDGR applications: decimal/atomic amount conversion, canonical payloads, Ed25519 and BIP-340 helpers, asset identifiers, silent-payment derivation, and declarative-contract valida

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LDGR protocol

@ldgr/protocol contains the versioned, pure protocol primitives shared by LDGR applications: decimal/atomic amount conversion, canonical payloads, Ed25519 and BIP-340 helpers, asset identifiers, silent-payment derivation, and declarative-contract validation.

It does not connect to a ledger, submit transactions, or store keys. Use @ldgr/client for backend HTTP integration and @ldgr/wallet-sdk for a browser site that asks the LDGR extension to confirm an action.

Silent-payment primitives

deriveSilentPaymentIdentity derives independent sender-DH, receiver-scan, and BIP-340 spend branches from an existing 32-byte recovery seed. Payment codes use network-specific Bech32m HRPs; sender and receiver output derivation binds the sender, asset, nonce, and output index. Version-0 Ed25519 addresses remain Bech32-compatible, while version-1 one-time BIP-340 addresses require Bech32m and a liftable x-only secp256k1 point.

These are low-level primitives. Applications must register the sender-DH public key before transfer, consume the authoritative ascending scan feed, and handle nonce and transport retries through @ldgr/client. The construction is LDGR-specific, not BIP-352-compatible, and should remain out of first-party mainnet UX until external cryptographic review is complete.