David Quinlan may refer to: David Quinlan (singer), Northern Irish Christian singer, naturalized Brazilian. David Quinlan (film critic) David Quinlan (rugby union, born 4 January 1978), Blackrock Col
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 0x4937573dccfcd5ea0da9320262f63c58f42d4abf6c9fcd6863dc681b649a9cdf. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf6f2600-431e-4dd2-bb8a-5d63ab685298.json and https://artists.proofprofile.net/proofs/artist/bf6f2600-431e-4dd2-bb8a-5d63ab685298.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).