thumb|Gunnar Persson in 1968 Gunnar Persson (13 October 1933 – 8 April 2018) was a Swedish cartoonist and comic creator. He was the son of Elov Persson, creator of one of Sweden's oldest comic strip c
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 0x0ab715197e4860acd37d63f2605cac5b193725bfde9e411b3db2c86135ea8a9e. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90114bd0-e81f-4230-b746-333b9b8c9f91.json and https://artists.proofprofile.net/proofs/artist/90114bd0-e81f-4230-b746-333b9b8c9f91.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).