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 0xa564cab7e934818c7dd8d22ce893981601b3eab5b718b796cd56baacb5119baf. 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/8322b7da-b816-4fc6-a154-c3ed8ed47142.json and https://artists.proofprofile.net/proofs/artist/8322b7da-b816-4fc6-a154-c3ed8ed47142.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Hungarian Dances: Traditional dance-music transcriptions and folk-style compositions that inspired Brahms
Brahms: Hungarian Dances & The Hungarian Tradition
Soprano Love Arias: 50 Must-Have Opera Classics
50 Years of Hungaraton (1951-2000): Singers
Tenor Love Arias: 50 Must-Have Opera Classics
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 0x72a8d21fbbf6e0ea37e885bb8a501586c1f53459cf6412a172d930adceab40c0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUAC60900122 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7051a2704d2231bfdb6979aae8eb8b0be44721de7580d9b719e8ed573f8d9e4. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUAC60900123 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdacb2b53181b66059c76a909916b8d765590c334edef387b1f9037cd852cad. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUAC60900125 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99b81ef9e6f11f16316916fbb6594bfe6b697fbd1e531e2b60e96b99ca8954e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUAC60900126 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0952af1eea6cbd1c3f0a90eed0134aacb27104a2dcff91749fce05782430ee48. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUAC60900128 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfecb91a405b252d035c6e7e91027aeda65a7c4d3f6d86ce66a85e522a5166cbd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUAC60900129 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c9281ad22ef950701582fc5b88c40ba11a51ee036fbd175196c90d07f8a0ce. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUAC60900132 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b93e635f8d91c8be9d443551a378701ff2599c54d95190888a42b5d49b53d03. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUAC60900137 — a six-check JSON result.
Goethe And Music, Vol. 1 - Beethoven, L. Van / Mendelssohn, Felix / Gounod, C.-F. / Berlioz, H. / Massenet, J. / Mahler, G. / Spohr, L. / Boito. A
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253fdda085497cb0ed8e51d46bfb44814e72a0f12463375960a59189bb6bce78. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0931201 — a six-check JSON result.
Meeresstille und gluckliche Fahrt (Calm Sea and Prosperous Voyage), Op. 27
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82efe4324923ebf9a86a148c8d714246be256a32785a445ae3cc2a6c94075eca. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0931202 — a six-check JSON result.
Faust: Faust, Act I: Le veau d'or est toujours debout
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d16c1b353ca52151551289ab2f4fb1bb09767742a73097849687a0879e18eb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0931203 — a six-check JSON result.
La damnation de Faust, Op. 24, Part II: Ballet des syphes (Dance of the Spirits)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3775d54df99a8bf054852380e9ec83b50fbb4a7a2b77d2a90b5f607565b8f5f3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0931207 — a six-check JSON result.
Don Pasquale: Act I Scene 2: Cavatina: Quel guardo il cavaliere (Norina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ca3145e58533814bdbe2d5514bf52d5397167f63989ba4b8d44cbd844c6202. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA251241607 — a six-check JSON result.
Symphonie fantastique, II. Valse. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dca9863839799c4c0d4dd0b80d601f8e505835f4b1e9a9dfb9c11d743fc20cb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEY472272627 — a six-check JSON result.
Mahler: Symphony No. 8 "Symphony of a Thousand"
Mahler, G.: Symphony No. 8, "Symphony of A Thousand"