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@canton-vc/core

v0.3.0

Published

Canton V2 JSON Ledger client — pure protocol wire layer for the canton-vc reference implementation. Config + Zod request/response validation, command builders (mint / verify / revoke), party parsing, retry-aware fetch. No business logic, no DB dependency.

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Links

Git

Maintainers

0xflydev0xflydev

Keywords

cantoncanton-networkdamlledgerkycverifiable-credentialsvcidentity

Readme

@canton-vc/core

Canton V2 JSON Ledger client. This is the single source of truth for the Canton wire layer used by:

  • Issuer backend (e.g. the reference operator's apps/web) — mints, revokes, queries KYC credentials.
  • @canton-vc/credential — exposes verifyDisclosure() so consuming firms can verify a credential against their own Canton participant without depending on the issuer's infrastructure.

What lives here

Pure Canton protocol code: no database, no application state, no Drizzle / Postgres / Next.js. Strictly the bytes that go over the wire to a Canton participant's JSON API plus the helpers to parse them back.

| Layer | Module | Purpose | |-------|--------|---------| | errors | single CantonError class + code union | typed failure surface | | config | loadCantonConfig + zod schema | env-backed client config | | types | branded ids + CIP #204 data shapes + claim accessors | type safety across the boundary | | schemas | zod schemas for V2 API responses | wire validation | | party | party-id parsing + namespace cache | identity layer | | http | fetch wrapper with timeout + retry | transport | | commands | pure builders for V2 command bodies | request shaping | | ledger | high-level write ops (create / verify / archive-as-holder / revoke / NFT mint+burn) | full credential lifecycle | | query | read ops (ACS + disclosure blob extraction) | post-mint inspection | | client | facade class + process singleton | one-stop entry point |

SDK surface (CIP #204 + implementer extensions)

The Canton.VC.Credential template implements the Cip204.Standard.Credential interface (viewtype CredentialView). The SDK wraps every choice exposed by the deployed DAR:

| SDK method | DAML choice | Source | |---|---|---| | createCredential() | template create (joint signatory: issuer + holder) | implementer (implements CIP #204 via interface instance) | | verifyCredential() | Credential_PublicFetch (nonconsuming interface choice) | CIP #204 | | archiveAsHolder() | Credential_ArchiveAsHolder (consuming interface choice) | CIP #204 | | revokeCredential() | RevokeCredential (template choice, cascade-burns bound NFT) | implementer (issuer compliance path) | | createKycNft() / burnNft() | KycNFT template create + BurnNft choice | implementer (soulbound showcase companion) |

Consumer-side verification

A third-party firm can verify a credential against its own Canton participant by exercising Credential_PublicFetch with the issuer-supplied createdEventBlob attached as a DisclosedContract. Canton authenticates the blob against the sequencer signature server-side; the choice body enforces expectedAdmin == admin so a substituted credential is rejected at the chain boundary.

@canton-vc/credential's verifyDisclosure(claims, { canton }) wraps this whole flow so firms write five lines of code, not Canton protocol bytes.

Workspace consumption

apps/web and @canton-vc/credential both depend on this via pnpm workspace links ("@canton-vc/core": "workspace:*"). The package exports TypeScript source directly (main: ./src/index.ts) — no build step.