cose-hash-envelope#3
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Why: attest an external resource (not embedded claims) and support future proof of possession, per the DIEM direction. - Emblem is now a COSE_Sign1 hash envelope (draft-ietf-cose-hash-envelope): payload = SHA-256 of the resource; protected header carries 258 payload-hash-alg (-16), 259 preimage-content-type, 260 payload-location. - CWT claims ride in the protected header (RFC 9597, label 15), kept minimal: `sub` plus a `cnf` (RFC 8747) COSE_Key (EC2 P-256) for holder PoP. - New media type application/digital-emblem+cose; served by GET /api/emblem. - Example resource: GeoJSON for St. Stephen's Cathedral, Vienna (public/landmarks/stephansdom.json, application/json), marked protected. - verify re-fetches the resource and confirms its SHA-256 matches the payload. - cbor-hex annotates the new labels (CWT Claims, cnf, COSE_Key, 258/259/260). - Homepage terminal + steps + a "worked example" section demonstrate it. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Why: attest an external resource with a COSE hash envelope and support future proof of possession.
258payload-hash-alg (−16),259preimage-content-type,260payload-location.sub+cnf(RFC 8747) →COSE_Key(EC2 P-256) for holder proof-of-possession.application/digital-emblem+cose; served byGET /api/emblem./landmarks/stephansdom.json, application/json), marked protected.Verified end-to-end over live DNS (local): PROTECTED, signature + resource-hash both green.
tsc/lint/build clean.🤖 Generated with Claude Code