The Dublin Guitar Quartet is an Irish guitar quartet that specialises in the performance of contemporary classical music, particularly music associated with minimalist composers such as Philip Glass,
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 0x179d3234447900fc37cd922897b8beff0d7a54ab3aa7a03661abc4723545df7c. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d64cbca-f529-4685-b811-ba6fc511458a.json and https://artists.proofprofile.net/proofs/artist/1d64cbca-f529-4685-b811-ba6fc511458a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).