NEP-641: Off-chain Authorization Resolution for Wallet Contracts

[frol]

Rendered NEP Markdown

It is open for discussion and we collaborate with DefuseLabs team on this.

[Copilot]

Pull request overview

Adds a new standards-track NEP (NEP-641) specifying a w_auth_resolve view-function convention for on-chain verification of off-chain authorizations, including recursive resolution for composite wallets (e.g., multisigs) and a NEP-413 fallback for regular accounts.

Changes:

• Introduces the NEP-641 specification for off-chain authorization resolution via w_auth_resolve.
• Defines the wire types/JSON format, normative semantics (purpose/recipient binding, payload equality), and a caller-side recursive resolution algorithm.
• Documents reference flows and security considerations for replay/downgrade/state-drift scenarios.

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[frol]

The use-cases that this NEP would enable are:

1. Sign in into a dApp with a proof of account ownership - e.g. Trezu allows to view the private address book (stored on Trezu backend) - PROVE_OWNERSHIP purpose
2. Approve confidential swap intents with passkey/metamask/... - sign off-chain message and submit it to the confidential API - APPROVE_OFFCHAIN_ACTION purpose

[frol]

This NEP is already implemented in the v0 of wallet contract for EIP-712 (Ethereum signMessage): near/intents#256 and on the client side it is integrated into NEAR Connect: azbang/near-connect#96, and it is live on https://trezu.org

[frol]

One more consideration that I want to bring up - will w_resolve_auth be compatible with NEAR MPC? I need to model it before concluding this NEP.

[frol]

This NEP is already implemented for Wallet Contracts and they are live in production on Trezu:

• feat(wallet): NEP-641 w_resolve_auth off-chain authorization resolution intents#319 (up-to-date implementation)
• feat(wallet): eip712 variant intents#256 (slightly outdated, so needs to be updated)

Thus, this NEP is now ready for review.