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 0xd72328d8afdac216b096e7477a3fece5642c5de49a5ec8eaf1b007162c83281a. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8deb4b5-0866-4ecd-85b0-3141b4ae87eb.json and https://artists.proofprofile.net/proofs/artist/a8deb4b5-0866-4ecd-85b0-3141b4ae87eb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Modern Studies for Guitar: an Italian Approach
Manuel Maria Ponce: Sonate e Trascr per chitarra
24 Studies, Op. 35, "Exercises": No. 22 in B Minor (Arr. A. Segovia for Guitar)
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 0x4d6be1ba78ccbe47a684782365b441157eb02d42201391a66214352d28f2da32. 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/USB8U1072382.
24 Studies, Op. 35, "Exercises": No. 17 in D Major (Arr. A. Segovia for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e57099a310005afcc0002af8846abb09756982941eb9877e4535b045ffe92f. 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/USB8U1072383.
Paganini: Ghiribizzi...e altri Capolavori (Musica classica - i capolavori...)
Quintetto No. 4 in D Major, G. 448, "Fandango": IV. Fandango
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e62de660d7850d1c9f11ab3ada43f3acc2376e6e8fcf914af5baf1b8437b97. 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/NLN580566237.
Nicolo Paganini: Opere Per Chitarra Sola
Die 100 Schönsten Hits Der Akustik Gitarre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c57f0107a926bb5b86b464b4173180d9d00fc018f5ad93be551a7d1c208f370. 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/ITS040300274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ab13011ff1bdacdf0bed2e16e4661654b7ac999240cdf7bfaf63a4133d013e. 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/ITS040400455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7119ee90bee91bb7bc36021553decb335f6b692f920a12a304dc87e868ff620. 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/ITS040400460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5e1fc89045242801bddddf87edb76826b75b0088ca00d525531d4c60343af9. 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/ITS040300268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0007b2cf61b0fd4304ae0bf7b804ef9360528b82f48c15e7d4309970e1d4a36f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ITS040400459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d83d55af65065e0499e0c1a8e9d24491913e0a0645d71d9a19fe17960a8aaf. 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/ITS040400461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a9b267882112845cfabcdda92e962ae037fea19478b5558ee2782d39f46f2a. 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/ITS040400469.
Here There and Everywhere - Guitar Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94cf68a76e9cd7e1defccf3180a9a90bb1fb441245bae15ecd350f476f5a32d2. 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/ITS040400456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92c11e9551f967c1a693d50d225fcfac697daa699531423e3b11164c2f3eedd. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ITS040400468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c32112891eabecb5fd3cc55d60342c2e1f013165e0cce4e71e37c3fe5abd25e. 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/ITS040300266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b368bbaf8a3c87c224260335ff56f98e03ca3d6ff47747e157943ea6aa0f7d. 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/ITS040400467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50677844ece607c5334be92b9c7ec1c86f677efd25aab66c82312aebbaa9a627. 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/ITS040300269.
Lucy in the Sky with Diamonds - Guitar Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d96d984daec5474b729208fa3155b4b4a2140f05de50e6e2062200e8c67a539. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ITS040300267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a39d79ceb31946bcc52d53873d1c197a4a08bb9e5662dd9ff478d14c172d3b4. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/ITS040300272.
The Long and Winding Road - Guitar Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaee9608b740782575ed3d1e390d3a24e513324ed85763cd953406138be185c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ITS040300275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8cd1576efffb8d4daa16230396ba827aa0a8700020db41647b1dcacd51178d. 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/ITS040300968.
Concerto for Cello and Strings No. 2 in D Major, G. 479: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959af12d4e3e0bf12c677a5a54c5fb55cf659faf33cf889f2f936c52d7e4328f. 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/NLY330606109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041adbde6676dad9a8094abde3234a5c44dc54047afb0a5d970e91ae9d986477. 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/FR6V81572387.
Antonio Vivaldi: Beatus Vir - Concerti Per Più Strumenti
Underrated Classical: Over 4 Hours of the Greatest Classical Music You Should be Listening to, Volume 3