thumb|Philip V, King of Spain wearing two types of sash: a red waist sash and the blue sash (Cordon Bleu) of the Order of the Holy Spirit A sash is a large and usually colorful ribbon or band of mate
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 0x699a8994c5dd95ae0c7be78fe8575e87fa46f4a2814c2bd79a448000487ebf32. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e70e20f-2868-4f48-a7da-1df6b89178d5.json and https://artists.proofprofile.net/proofs/artist/9e70e20f-2868-4f48-a7da-1df6b89178d5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).