thumb|upright|Sarcofagus Sarcofagus was one of the first heavy metal bands from Finland. History Sarcofagus (Sarcophagus LTD) was founded in 1977. The band's frontman Kimmo Kuusniemi stated in the do
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 0x8e6585d91ab694afa8bbc1482e386274fbb46ffc544568fde1d4822e0ca30a80. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/685bb385-51b1-4a88-91b1-3e72b5b35521.json and https://artists.proofprofile.net/proofs/artist/685bb385-51b1-4a88-91b1-3e72b5b35521.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).