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 0x288df903cf6b52fd30f76c1926c2d281047f81a9501482047e5a7982b8e5efb0. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc62ac82-18ce-446f-85ea-37a981248c6b.json and https://artists.proofprofile.net/proofs/artist/fc62ac82-18ce-446f-85ea-37a981248c6b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Clarinet Exam Pieces from 2022, ABRSM Grade 3
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 0xdc49261f11dd9f1de0f5ea29094565f1bdb416a39b367698df38f302a43ecd67. 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/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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6191a715f4dd8a15899490f757d6827d08f31b0deb8588046179730109fbec9. 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/GBEYQ2170507.
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 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/GBEYQ2170508.
B:1 Adagio (2nd movt from Clarinet Quintet No. 3, Op. 23)
Clarinet Exam Pieces from 2022, ABRSM Grade 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9feccd1ff8eefe853a61636efae57a4d18f6ae14e042a8cd66e3868fb3a9e7. 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/GBEYQ2173604.
B:3 Prelude (1st movt from Victorian Kitchen Garden Suite)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dfe3b8f3747f683d8695d7062c2a034ac0ab570c4b44f4fa0470dc35a55d4e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBEYQ2173606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc377954f9f3ed87e12db2df0d35a26c4e99bbbe2c4bb5ef02c93e96630818bd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBEYQ2173607.
Clarinet Exam Pieces from 2022, ABRSM Grade 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad52173de04826fc46a2aa9f53ddebf8a06896c39487969de35d58e0a6957440. 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/GBEYQ2169903.
Clarinet Exam Pieces from 2022, ABRSM Grade 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be3de99203a355c6a59073f3344f672f9dea00b69be315bf9d0ef83c1d0ab8e. 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/GBEYQ2168203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b12d5f4c8faddce956449dca64666a630a78ab73e7b2c0fc05ca2086b0c56d. 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/GBEYQ2168204.
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.
A:1 Allegretto and Allegro con fuoco (2nd and 3rd movts from Phantasy Suite, Op. 91)
Clarinet Exam Pieces from 2022, ABRSM Grade 7
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c1db904a248c2bd58c7781aaaab17f111fcaf9d70c8f8941db3e2b1349cdf0. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBEYQ2174301.
A:2 Allegro (1st movt from Clarinet Quintet in A, K. 581)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1248c68097fb8c8e4d16e5aaff2aaf4cfeed08e2f3287e113e4970fd50ed30. 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/GBEYQ2174302.
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.