Assurance may refer to: Assurance (computer networking) Assurance (theology), a Protestant Christian doctrine Assurance services, offered by accountancy firms Life assurance, an insurance on human
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 0xa2f22247594cf588760f2bd3e6af400887d693b96e6f19bd60638ffaaba9abbf. 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/5205089a-4638-4411-b531-17edc5b0fad6.json and https://artists.proofprofile.net/proofs/artist/5205089a-4638-4411-b531-17edc5b0fad6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).