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OPEN#923 Issue

CIP-56/ERC-20 Middleware - #453 - Milestone 4: EVM/Canton Bridge, Relayer, Integration & Documentation

Opened 21-10-2026 by pedrodneves, last activity today

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Milestone 4: EVM/Canton Bridge, Relayer, Integration & Documentation

Combines the bridge/relayer, end-to-end integration testing and demo, and the developer documentation.

  • EVM/Canton Bridge and Relayer

    • Relayer service (pkg/relayer/, cmd/relayer/) implementing a generic Processor with Source/Destination adapters for both Canton and Ethereum, enabling bidirectional token movement.
    • Canton bridge Daml contracts (bridge-core) for the on-ledger side of locking/unlocking and minting/burning bridged tokens.
    • Ethereum bridge contracts for the EVM side.
    • Bridge state store (pkg/db/) tracking transfers, chain state, and nonces.
    • Reference bridged asset: PROMPT (ERC-20 → CIP-56 holding).
    • Unit, integration, and end-to-end test suites including local bootstrap (scripts/testing/bootstrap-local.sh) running Canton + Anvil + middleware + relayer in concert.

  • Integration Testing & Demo

    • End-to-End Functional Test Suite: comprehensive automated tests validating all ERC-20 operations.
    • Scenario-Based Daml Simulations: integration of test scripts that simulate realistic user flows.
    • Mock Frontend / CLI Demo Application: a lightweight web UI or command-line interface that showcases ERC-20 usage.

  • Documentation & User Guide

    • Developer Integration Guide: how third-party developers interact with the middleware, including API endpoints, authentication flows, example payloads, and token operations.
    • API Specs: documentation of all ERC-20-compatible endpoints, suitable for inclusion in SDKs or third-party tooling.
FieldDetails
Estimated ResourcesEngineering: 12 weeks; Project Management: 2 weeks
Estimated Duration6 weeks
Amount2,500,000 CC
Acceptance Criteria 1An Ethereum↔Canton bridged-asset round-trip (deposit → mint on Canton → burn → withdraw on Ethereum) is demonstrated end-to-end with the reference asset.
Acceptance Criteria 2The end-to-end suite (all ERC-20 operations plus bridge flows) runs green on the local-bootstrap harness (Canton + Anvil + middleware + relayer), reproducible by a reviewer.
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