thumb|Nigel North (2012) Nigel North (born 5 June 1954) is an English lutenist, musicologist, and pedagogue. Student days He studied guitar on a scholarship to the junior department of the Guildhall
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 0x5bf8f381e5becebfa3ba7a4d0d722a44d8fccfd851b99dd1788bf9491ad527c5. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/557dddd5-03c1-4a21-8167-c8cce2e882ca.json and https://artists.proofprofile.net/proofs/artist/557dddd5-03c1-4a21-8167-c8cce2e882ca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pimontoyse (Arr. for Guitar by Nigel North)
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 0xe4c4db7db350199d2ca268735d50cfb198b74df373086ae13d2aaab797d8984e. 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/GBAJX8401804.
Fantasia que contrahaze la harpa en la manera de Ludovico (Arr. for Guitar by Nigel North)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868535678b5490585f4ea62a1a223b8ee633e5a04ccdf680e62daaaae8a26036. 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/GBAJX8401807.
Romanesca: O guardame las vacas (Arr. for Guitar by Nigel North)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0888fb51901dc32683f4ed62e235462ecbf9a6780725f17efd0849fcc31bd83c. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/GBAJX8401802.
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
The Heart Trembles with Pleasure: Music for Lute by Sylvius Leopold Weiss, Vol. 1
Cantabile: Music for the lute by Sylvius Leopold Weiss, Vol.2
Purcell: "O Solitude, My Sweetest Choice", Z. 406
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e84714591f50c539c18374f8e4504ac467690e0d0f4fa85b56496c753338372. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBAYC9202201.
Concerto for Viola d'amore and Lute in D Minor, RV 540: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba0d57bedbf68130f96b4abf30ff2eea608265180099c9905cbf3d846f635c7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEF058602313.
Concerto for Viola d'amore and Lute in D Minor, RV 540: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58c92e016fdcf73a60b1266c96aafec7845324c064be03ca1db65d34a5f29de. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEF058602311.
Purcell: Not All My Torments Can Your Pity Move, Z. 400
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10d5c09a1a92667e33100e1eb9c435a256db31fc2542c677e79a40217420bf1. 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/GBAYC9202185.
Purcell: Stripp'd of Their Green, Z. 444
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c9993a56872a2543458f2d71883c77bfe22f1538371408036f6020011e4f85. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBAYC9202186.
Purcell: Tell Me, Some Pitying Angel, Z. 196
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee505b4437a8a0311ee040f1f8a78f66b16ac31ac1867bd090e35a5ecb5d60cc. 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/GBAYC9202194.
Purcell: The Fairy Queen, Z. 629, Act V: Song. "Hark! the Echoing Air"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37aa4420ceac2d46f01e207dd8089c09f06c6058f9f82920ebdb2dab95ef20ca. 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/GBAYC9202196.
Purcell: Pausanias, Z. 585: No. 1, Song. "Sweeter Than Roses"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0576398fb186fa4ec403c6e8900507663eb7ac54811ec22f65963a05cc5f6e6a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBAYC9202199.
Purcell: The Tempest, Z. 631, Act IV: Song. "Dear Pretty Youth" (Dorinda)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cda90b6d4b59f114c2e915ffbe62f96942a33c7ae76cbc9d18afe389417669. 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/GBAYC9202191.
Concerto for Violin and Strings in E, Op. 8, No. 1, RV.269 "La Primavera": 1. Allegro
The World of The Academy of Ancient Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dee7bd067f947af0bfa41eaca087587ccb018ba884841abf8f9f561f4b8d052. 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/GBF078242001.
Concerto for Violin and Strings in E, Op. 8, No. 1, R.269 "La Primavera": 3. Allegro (Danza pastorale)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e4615f6a73b639155b392da5692172a866b26f89327c3d0a88728efa0e6cc9. 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/GBF078242003.
Concerto for Violin and Strings in E, Op. 8, No. 1, R.269 "La Primavera": 2. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8564a754b2b1494fd2251819143203f0ef593882a3add2d9adb7e1d4c068b21. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/GBF078242002.
The Indian Queen, Z. 630, Act III: I Attempt from Love's Sickness to Fly
The History of Opera: English Language Opera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d610b47ac98ed3c979c28d84b6ef683204ddd8618ca0e522ac9cca2552618e5. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/GBAYC9202207.
Concerto for Viola d'amore and Lute in D Minor, RV 540: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a7414661c2faad912de1a1944ec54e294a06de90d9fbfd464eb6e183c28a2b. 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/DEF058602312.
Purcell: The Libertine, Z. 600: No. 1, Song. "Nymphs and Sheperds"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac29cc38c0ad01a107df06482da81e7f46619006ffe8d159574fabffa02ed2fc. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GBAYC9501743.
Purcell: The Fatal Hour Comes on Apace, Z. 421
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7e82015244e242cf5f44c51b6121ea5f4686bc3655e0bdd80cd317f8347d18. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9202188.
Purcell: Incassum Lesbia, incassum rogas, Z. 383
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01495ca64efc9bccb24933dde9421bad7d0d7f9d432a31c11908789d18878bba. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/GBAYC9202197.
Purcell: Cupid, the Slyest Rogue Alive, Z. 367
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819e068e9074dd854d37ee47a92d86c941387cc6f0fbe3c721a432314d45bc90. 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/GBAYC9202189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869a2d2a3abc110a772b0bd682a73e38301b832929800c0b7d491e56ce9c6392. 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/GBAYC9202200.