Proposal: CIP-56/ERC-20 Middleware

[Eunoia-cym]

Development Fund Proposal Submission

Proposal file:
/proposals/2026-06-Eunoia-cip56-erc20-middleware.md

SIG Label: token-asset-standards
Champion: Canton Foundation

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Summary

MetaMask-compatible middleware exposing an Ethereum JSON-RPC facade over CIP-56 token contracts, plus a distributed indexer and an Ethereum↔Canton bridge relayer. Any EVM wallet, dapp, explorer, or indexer can transact against Canton-native tokens through the RPC surface it already uses, while Canton's privacy and finality guarantees are preserved. Phase 2 adds fully non-custodial signing via a MetaMask Snap plus an institutional custody path; all deliverables are Apache 2.0 open source.

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Checklist

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

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Notes for Reviewers

• Resubmission of Proposal: CIP-56/ERC-20 Middleware #440 (auto-closed for missing SIG label + Champion). Both now included: SIG label token-asset-standards and Champion Canton Foundation.
• Includes a CIP-112 (Token Standard V2) migration plan with per-layer code-reuse estimates and a contingency clause for mid-Phase-2 ratification.
• Includes an explicit audit policy (independent third-party audits of the MetaMask Snap and the full middleware stack, reports published under docs/audits/) and a post-grant long-term sustainment commitment funded by the Applicant.
• Total request: 40M CC (Phase 1: 15M, Phase 2: 5M, Maintenance Y1: 10M, Y2: 10M). Project duration > 6 months, so the 6-month CC re-evaluation stipulation applies.

[github-actions]

SIG labels auto-detected and applied: token-asset-standards

If this is incorrect, you can ask the reviewers to update the labels.

[github-actions]

Champion identified Canton Foundation

The committee will verify this champion during review.

[Jatinp26]

Hey @Eunoia-cym
I see you added Canton Foundation as champion, kindly share who in Canton Foundation have you discussed and got the review for your proposal.

[Eunoia-cym]

Hey @Eunoia-cym
I see you added Canton Foundation as champion, kindly share who in Canton Foundation have you discussed and got the review for your proposal.

Hi @Jatinp26. It was Viv Diwakar

Thanks,