upright=1.0|thumb|Tiled wall in Guernica, the inscription below, written in Basque, expresses the desire to have the Picasso painting of the same name transferred to the city (it is currently exhibite
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e70b10300532fe43352e3150544c2e0c4787b734c6203473cc5ae0ea109d0d3. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00d43aee-3649-46be-b695-e16acd548747.json and https://artists.proofprofile.net/proofs/artist/00d43aee-3649-46be-b695-e16acd548747.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).