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 0xbbb28e78921c51435818e66e11c4d35067be69f988d95290483ea6bfaf9c4837. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/86f17c91-f2fc-48e4-af5b-0a07e51e1a32.json and https://artists.proofprofile.net/proofs/artist/86f17c91-f2fc-48e4-af5b-0a07e51e1a32.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Echoes of Bohemia - Czech music for wind
Clarinet Exam Pieces from 2022, ABRSM Grade 6
A:1 Corrente (2nd movt from Partita No. 2 in D minor, BWV 1004)
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 0xa6c693a82ee0c7715677ca1ec540ae0f653faac384b7c254ad161f9ba91b0f12. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBEYQ2173601.
B:1 Adagio (2nd movt from Clarinet Quintet No. 3, Op. 23)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9feccd1ff8eefe853a61636efae57a4d18f6ae14e042a8cd66e3868fb3a9e7. 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/GBEYQ2173604.
A:3 Allegro ma non troppo (1st movt from Sonata No. 5)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00774483da0895247781e99264fcb81d5a46150b1cef1a4a32939112f4ff4b0b. 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/GBEYQ2173603.
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
Clarinet Exam Pieces from 2022, ABRSM Grade 3
A:1 Il mio tesoro (from Don Giovanni, K. 527) (accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1d9170455f443a2e0b87cb66d1719f7ccffef20940c02ef1313de639fbf85d. 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/GBEYQ2170510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7272d3f8fe99191ae0f455c133111bb972c043001fcadde1c7e7a882a1beccd. 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/GBEYQ2170502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c31a619a31c6f46cb1bd1ff6452cffee8ff89b12a1980c0a68c4d1ad67c77df. 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/GBEYQ2170512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0ed146dd0c57099da4740ded2e55bba9821ff41edb74a33f593168e7d0639b. 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/GBEYQ2170504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc49261f11dd9f1de0f5ea29094565f1bdb416a39b367698df38f302a43ecd67. 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/GBEYQ2170505.
B:3 Venetianisches Gondellied (No. 6 from Lieder ohne worte, Op. 19b)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39554bc6aec6d1649e1ea0142adece2ecb3fcc8dc6fa437c723b9936c167d4f. 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/GBEYQ2170506.
C:2 Cha-Cha Chart (from The Quintessential Clarinet, Vol. 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85dd4f7fadc6b647f40d9f194707374782d3b6149566a2cdb0591b9c6576164e. 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/GBEYQ2170508.
A:1 Il mio tesoro (from Don Giovanni, K. 527)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b7a300431faff1b0143a01e2db76a54c3084f610e9edce94eeae6f475e04ed. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/GBEYQ2170501.
A:3 Witching Hour in the Castle (No. 1 from Clarinet Stories/Klarinettengeschichten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4640869b604043987733da5219e549cb951e662e7d2f648bd5bf764e79731a. 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/GBEYQ2170503.
Clarinet Exam Pieces from 2022, ABRSM Grade 2
A:1 Gavotte II (Musette) (from English Suite No. 3 in G minor, BWV 808)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95631a327747a421013d7dd5a1722eb86e6ff90a69687c8491fd10b413a91a0e. 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/GBEYQ2169901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18b9fa40c8de405a2ba4d047646f92b247ec5a519a63ee5f5c6f9890652f223. 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/GBEYQ2169904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd5a19d4775e1f433d4439c951d06d76cc892e14b0290bbf6a85fcdb3f6bbbd. 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/GBEYQ2169905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3eda41571b67577673ec23e68f9324eaedcd9cded039a67e1eb72ee461b1d7. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBEYQ2169912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0999defd725357b62d0e8fa508d6c699af0444925488d853024923aad9bf599. 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/GBEYQ2169906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93dddca23491328496e4ad72035cd919a94e4471af34781d936a667b0a3cde13. 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/GBEYQ2169908.
Clarinet Exam Pieces from 2022, ABRSM Grade 1
A:1 Senti! La danza invitaci (from Lucrezia Borgia) (accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe589524e8dec8a8147198edb843077da5f7d51dab6d591a178f55524a39dea01. 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/GBEYQ2168210.
A:2 Menuet in G, BWV Anh. II 114 (accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019c76807a7879d9081217de9b733c0261849392ef71f6696c0c3958646c6527. 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/GBEYQ2168211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b12d5f4c8faddce956449dca64666a630a78ab73e7b2c0fc05ca2086b0c56d. 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/GBEYQ2168204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be950d79b5549488ab29c1a57c0e1b3cc9c4423674acc2977ef270a15690150. 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/GBEYQ2168215.
C:2 Wallace and Gromit Theme (accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e5012dd11e0987f7ecd874b229d5e8c80653a43a76b1517fd593fe9a2fde07. 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/GBEYQ2168216.
C:3 Chimpanzee Cha-Cha-Cha (from Zoo Time!)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee2d8ae7f4a11876cde4360c597f3715dba2f0cfce9e77b7207da678222f461. 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/GBEYQ2168209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf5bea0845a2f548fc71ff853fa1abe379e91ea267ecf5f90bf8a71a9b753c7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBEYQ2168202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de5bc5b610ca5a5a3d84ba2048115e3bde5417f1fd07ed28face7e91face9f2. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GBEYQ2168206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f52abec7ab72aa3b905fdc659a1ab047e71970c94e93e85d185b72a733dcf6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBEYQ2168207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233eec2d72bb89d20ac23041652bfe345adf3c996a3769536a9b5f4e33c19dd2. 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/GBEYQ2168208.
Clarinet Exam Pieces from 2022, ABRSM Grade 7
B:2 Allegretto (1st movt from Sonata in E flat, Op. 167)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2bf6f72e0fc807eeb40a1ad014372e240e63b7eb274a807154967c7b1bdb6b. 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/GBEYQ2174305.
C:2 Allegro molto (No. 5 from Dance Preludes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a24ecc37e6c73216441a5bbd0da7e2bfa0e215f88696c25ca290087492fdfc0. 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/GBEYQ2174308.
Clarinet Exam Pieces from 2022, ABRSM Grade 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ba6af7ec7afb81e60ee0fa43af9ee10cdbcdf0cdec3926ea056ef80457f64b. 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/GBEYQ2171202.
B:2 Heather Hill (No. 1 from Two Contrasts for Clarinet and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025c7a10845e75e72e4be3ebe28b075a97d3e36873ca5132b84d26779dc15cb2. 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/GBEYQ2171205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7425901e6ca1e6d1c6ca2237420210fc2713d0ea9ce61e1aecf5b06b8f76b7. 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/GBEYQ2171206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4b8cd222343d026169119efd3f58942998cc9f97ca87b1a5b7700886eb5ee5. 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/GBEYQ2171207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e12353257a676694e7c6f2d12ef91f9b3ac7e62bb9f9d9fef06e26a7b16fefd. 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/GBBZS2163101.
Twentieth-Century Chamber Works for Winds