Laurence Dreyfus, FBA (born July 28, 1952) is an American musicologist and player of the viola da gamba who was University Lecturer and Fellow of Magdalen College, Oxford. Early life Dreyfus was born
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 0x5ea9944ff631d3e1695fdceb4dcc65516455f5a8cea6cd284a7bbaf986e56afe. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5adfc018-1ad2-4390-8531-acc6e4cd383a.json and https://artists.proofprofile.net/proofs/artist/5adfc018-1ad2-4390-8531-acc6e4cd383a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Inventions and Sinfonias: Sinfonia No. 1 in C Major, BWV 787 (Arr. for Ensemble by Laurence Dreyfus)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2500e3b60fffd65f3b90ae095efdaa400afcb5621e36e0acede7527ba8e65a76. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370801 — a six-check JSON result.
Clavier-Übung III: Christ, unser Herr, zum Jordan kam, BWV 684 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687d4d2fd3a3a23b552914c32830eb7dbe33c12b190db62ed451e48b9f617a9a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370802 — a six-check JSON result.
Clavier-Übung III: Christe, aller Welt Trost, BWV 673 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba76d6f6d9ccc21bc1295c2aac74d5447bf5a42901f89ed39fb99bcaa969465. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370804 — a six-check JSON result.
The Well-Tempered Clavier, Book 2: Fugue No. 24 in B Minor, BWV 893 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dbfbe0102534caeea64f3a78a54875f434f0dc7cf080cbda6d6a20b0f720da. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370805 — a six-check JSON result.
Clavier-Übung III: Wir glauben all’ an einen Gott, BWV 680 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247be9f04fca8f05844accec8830c11748590ed6b22791fdf508b1bd3e21568a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370806 — a six-check JSON result.
The Well-Tempered Clavier, Book 2: Fugue No. 15 in G Major, BWV 884 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1398de9e0b1a55b26136f3197bebca3a90f9f759c0cb970244315f6d9f13b148. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370807 — a six-check JSON result.
The Well-Tempered Clavier, Book 1: Prelude No. 18 in G Sharp Minor, BWV 863 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cd0df5ccf2582ecaeba46a7fef1b4244e13037216a6f8e2ec865f129201b82. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370808 — a six-check JSON result.
The Well-Tempered Clavier, Book 1: Fugue No. 18 in G Sharp Minor, BWV 863 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18618af5006be6b9bdc760c37424bebb156023a00ce7d215436f3aefff7b58d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370809 — a six-check JSON result.
Clavier-Übung III: Fughetta super: Dies sind die heil’gen zehn Gebot, BWV 679 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a1bb9fcead223f7657a6e5a3a0269bf71ff4fd952580b704516fd71afb9c3f. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370810 — a six-check JSON result.
The Well-Tempered Clavier, Book 1: Fugue No. 2 in C Minor, BWV 847 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90fb98e6813a2902cdfaa6edc7fb7ec7ff3d8a66567aae8755073d70be85da1. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370811 — a six-check JSON result.
The Well-Tempered Clavier, Book 2: Prelude No. 12 in F Minor, BWV 881 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9875a62f1b6f980110fd4eba2db2eb76dc150680981575ecfce6f3baa3c8d28. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370812 — a six-check JSON result.
The Well-Tempered Clavier, Book 2: Fugue No. 12 in F Minor, BWV 881 (Arr. for Ensemble by Laurence Dreyfus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec2371044067e70f217ea88bd4e1a7970dc24febfb43e41096d74591ef97698. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBASH2370813 — a six-check JSON result.