thumb|upright=1.3|A typical umbrella hat An umbrella hat is an umbrella canopy attached to a headband that functions as a protection against the drizzle rain or sun. It is seen as a novelty item. De
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336a2a16aff618dcaa638dfa69f4c2ff7039d9f042a86aea54be40694bee6b68. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e4729fa5-f18a-402b-8708-21b97b0519cf.json and https://artists.proofprofile.net/proofs/artist/e4729fa5-f18a-402b-8708-21b97b0519cf.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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