Saint Tanca (died 637) is the name of a sixth-century French Roman Catholic saint. Tanca was born in Troyes, France. She was killed while defending her virginity when attacked by a servant. She is co
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 0x58b7208148a936551d00c0467fa8de7ff7dd2c62216b64da9027742b95733310. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bb40df82-68e7-4cc1-853e-458dd9bbd291.json and https://artists.proofprofile.net/proofs/artist/bb40df82-68e7-4cc1-853e-458dd9bbd291.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).