Sir Quentin Jeremy Thomas (born 1 August 1944) is a retired British civil servant, and former president of the British Board of Film Classification. He attended the Perse School in Cambridge and Go
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 0x065cbabc947e7f2e9790a9241fea8a87691d17b0e31ea657e0670ece2215297c. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6021da0-77c4-4004-a548-464ed2638864.json and https://artists.proofprofile.net/proofs/artist/f6021da0-77c4-4004-a548-464ed2638864.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3272b98320427e36876d7cf89cdf241ac82e78fec808f4302196c5262096d6e4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0203006.
Eben: Ókna (Windows) - after Marc Chagall: I. Modré Okno (The Blue Window)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac7de9e4f0f7a99eaaeae890dbc2197996d32ae5133bd1646358ec15820be73. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0203010.
Sweelinck /Arr Quentin, T. Balsom, A. : Variations on 'Mein junges Leben hat ein End'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf297649e309087c60e238c98252c8894248823ed8669f83ccac2a7ac496a6790. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0202998.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
Purcell / Arr. Balsom: King Arthur, Z. 628, Act V: Trumpet Tune
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc65aa2910a9d93721a6630bd4b10094f0fef014a2e5910ca32c6c53419b1877. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0203001.
Purcell / Arr. Balsom: King Arthur, Z. 628, Act V: Symphony
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2263ee77553f0f9ae8b4b5cc20d30b61a0c912ffbe2d0a9de3225005e4106f4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0203002.
Purcell / Arr. Balsom: King Arthur, Z. 628, Act V: Round Thy Coast
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe353c13e74c8a49a855197a409438249b52c5673e5db8fad2fa3f1d12fffb4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0203003.