Proposal: Canton Party Namespace Registry (CPNR)

Development Fund Proposal Submission

Proposal file: proposals/canton-party-namespace-registry.md

Summary: This PR adds the Canton Party Namespace Registry (CPNR) proposal — a privacy-aware, decentralized registry specification and reference implementation for Canton party identifier discovery across synchronizers, eliminating the need for off-ledger party identifier exchange in multi-party workflow initiation.

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Checklist

• [x] I have read the contribution guidelines
• [x] The proposal follows the template structure in proposals/_template.md
• [x] I have included a clear abstract, specification, milestones, and funding breakdown
• [x] The proposal includes adoption-based milestones with verifiable acceptance criteria

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Notes for Reviewers

• Label suggestion: party-portability-data-resilience (this proposal addresses cross-synchronizer party identity portability and discovery). Label can only be applied by maintainers.
• Authors: blackthornlover <h@bitdynamics.me>, Zhe Li <zhe@bitdynamics.me>, Srikanth <srikanth@bitdynamics.me>
• Implementing Entity: Bitdynamics
• Total funding requested: 1,400,000 CC across 4 adoption-based milestones