Howard Crook (June 15, 1947 – August 27, 2024) was an American lyric tenor who lived and worked in the Netherlands and France beginning in the early 1980s. Life and career Crook was born in Rutherfor
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 0x1d8e87536939d8457df75c0e01e795ee09c5a278e28014357b4f41e394c89444. 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/132d090a-ba26-4e22-8bc9-44d64f6ed23c.json and https://artists.proofprofile.net/proofs/artist/132d090a-ba26-4e22-8bc9-44d64f6ed23c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Magnificat in D Major, BWV 243: I. Magnificat
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 0x184cba343d35b30ac8ca8bbf54346e1616faf0ace581694d970e4a21f8f3b3c4. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBAYC8901791.
Magnificat in D Major, BWV 243: II. Et exultavit spiritus meus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839aaf93ac19f071425e0adbdf48d33960acbf4105564101abe47615abed0f04. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/GBAYC8901792.
Magnificat in D Major, BWV 243: III. Quia respexit humilitatem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cf477ec95802c59777d99d4d80a3feaaf0f5679cc8135a9886b4e2be2c9e3a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBAYC8901793.
Magnificat in D Major, BWV 243: IV. Omnes generationes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062c35a9aa4318d3e2686f498bd1795ab0c3614e63c707ddaff1a95f06ab4b0b. 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/GBAYC8901794.
Magnificat in D Major, BWV 243: VIII. Deposuit potentes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b42f1f607eb9b7241e988d476f3e27877ecf6e24ef818e8dec380286c10b8c. 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/GBAYC8901798.
Le Malade imaginaire, H. 495, Eglogue en musique et en danse: De vos flûtes bocagères (Flore, Climène, Daphné, Tircis, Dorilas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85a147e2177db8091d8d94037788be0d539e2819e574364cb8460a714f44f7e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2469130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfc6bd5e27d898b0312ef77a4efd406e10f38b0901891798cb06ff84a5303e9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USB8U1611526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73ff49a4d1f4bd70595fcfd9b907c21c2919a8e7871e481ebd5953ea147242b. 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/USB8U1611532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56caf7dbd94b0ff2050758748869a4584bd748f65de226542ee229fcdacbc4cf. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1611552.
Le Malade imaginaire, H. 495, Eglogue en musique et en danse: Quittez, quittez vos troupeaux (Flore, Climène, Daphné, Tircis, Dorilas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20942210665c63d56731a9e2c91ffda4bca482878b087693de8e60f8b92f391b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR7JM2469110.
Le Malade imaginaire, H. 495, Eglogue en musique et en danse: Ah ! quelle douce nouvelle (Flore, Climène, Daphné, Tircis, Dorilas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f0c63b1ddbb93119dc2c112f681a3f3b03d6c6090950c46e8c43848707d2fe. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2469120.
Giroust: Messe du sacre de Louis XVI: I. Kyrie
A Classical Coronation. Music for a Royal Celebration
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68cd05a841010c34e9b5fe6eb8e5064b30dd79f21968dfa85ed11e0fd4b9c7c5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208903001.
Jubilate Deo: Reges terrae et omnes populi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1b9185e3390fcf296b4bef1fef1d80d8e5882fa6823d82cb0c82a374baec35. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1611527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4686abef7db41b24f646773ac52e0b0446b2beaef4d67bd602eb00c8ff305e. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/USB8U1611529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5087cb2d621cdfb5dcedb14c1947b8a04bce9ba9d35c6433b7fcafaac787d58. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USB8U1611531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17b021a96a9ba741ab56b02d665c3ac4e73767748b90dfedce4acfef35e611c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1611533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ec6d72ce39a77554317632067522d8dd615bbed0d37035fa885aa291c0e97a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1611535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1473e7f9cffe499b707c75454d66583c64f1585258df2445b0f4d534e9e0ff. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USB8U1611544.