UCP Spec Reserves 'Wallet Attestation' Slot Without Defining It

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The Universal Commerce Protocol, released on 25 August 2026, uses the term 'wallet attestation' in its normative text but stops short of formally defining it. The phrase appears twice within the identity linking capability — once in the provider schema and once in the Future Extensibility section — where it is listed alongside verifiable credentials as a potential future provider type. Rather than a closed enumeration, the spec designates 'type' as an open string, meaning unrecognised values pass validation and unsupported provider entries are filtered out rather than causing profile rejection. Wallet attestation, as described conceptually, would allow a verifier to evaluate a blockchain-based condition and return a signed yes-or-no answer without exposing personal details like balances or addresses. This approach separates durable consent from per-transaction disclosure and eliminates the need for businesses to store session data or host consent pages for facts already verifiable on a public ledger.

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