Wallet Gateway Reference Implementation #109 Milestone 6: Transaction Visualization & Write Review Standard

Milestone 6: Transaction Visualization & Write Review Standard

Standardizing human-in-the-loop transaction approvals and solving the cryptographic Clear Signing challenge.

• TX Schema Standard: Definition of a standardized schema for transaction UI rendering.

Acceptance:* Publication of the schema documentation and verifiable adoption in the Gateway's parsing logic.

• TX Visualization: Delivery of modular TX Visualizer components handling Read Connect and Write Reviews, addressing the need for Clear Signing.

Acceptance:* Publication of the Clear Signing documentation detailing the specific cryptographic boundary and mitigation strategies ensuring the visual output of the Write Review UI exactly matches the hash submitted to the Keystore.

• Write Review UI (Visualizer): Delivery of the human-in-the-loop confirmation screen.

Acceptance: Functional UI component that accurately parses the JsPrepareSubmission payload, translates the standardized TX schema into human-readable state changes, and cryptographically blocks Keystore submission until explicit user approval is logged. User Documentation: Delivery of end-user instructional video. Acceptance: Publication of at least one step-by-step video walkthrough demonstrating the standard production setup and configuration of the finalized Wallet Gateway.

| Milestone | Target deadline | Funding Request | | :--- | :--- | :--- | | Milestone 6: Transaction Visualization & Write Review Standard | November 30th 2026 | 800.000 CC |

_Originally posted by @pedrodneves in https://github.com/canton-foundation/canton-dev-fund/issues/109#issuecomment-4512211311_