Proposal: Canton Participant Workbench

Open-source PQS-to-UI layer giving non-technical Canton participants (compliance officers, auditors, ops leads) human-readable visibility into their private ledger data. Deliverables: @canton-workbench/pqs-connector, @canton-workbench/pqs-decoder, compliance export schema, and a reference Next.js frontend with 8 pages (dashboard, contracts, contract detail, transactions, event graph, counterparties, stakeholder groups, compliance export).

Demo: https://canton-prism.vercel.app/

Development Fund Proposal Submission

Proposal file: proposals/canton-participant-workbench.md

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Summary

Canton Participant Workbench is an open-source PQS-to-UI layer that translates raw Daml contract data into human-readable views for compliance officers, auditors, and operations staff — the non-technical institutional users who currently have no way to act on their private ledger data without engineering support. The fund deliverables are two reusable npm libraries (@canton-workbench/pqs-connector and @canton-workbench/pqs-decoder), a published compliance export schema, and a production-ready reference frontend that any Canton participant or node operator can deploy against their own PQS in under an hour. By shipping open source software rather than a single-institution integration, this proposal lowers the cost of building compliant Canton applications for every future developer in the ecosystem. The team intends to build a hosted commercial product on top of these open-source components; that work is entirely separate from and out of scope for this proposal.

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Checklist

• [X] Proposal file added under /proposals/
• [X] Milestones and funding amounts defined
• [X] Acceptance criteria included
• [X] Alignment with Canton priorities described

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Notes for Reviewers

(Add anything the Tech & Ops Committee should pay attention to.)