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 0x23cb796a6e5de67866d43e0ae15d65b8e40d5c6aa5ec86e6dbac44fe5b556fef. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1da4bc6b-c136-4c44-9b9b-b9d7eb34e7da.json and https://artists.proofprofile.net/proofs/artist/1da4bc6b-c136-4c44-9b9b-b9d7eb34e7da.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Nocturne in E Flat Major, Op. 9 No. 2: II. Andante
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 0xedad64a429d263c6f7fadf49efb0ad3131fa2ef9b212c8476e8c96084bf799dd. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DELJ82001985 — a six-check JSON result.
Nocturne in C-Sharp Minor, B.49: Lento con Gran Espressione
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56217840726df0afb1dc5ab4d902ce73310f15092393cdb8a57ef89493c1984. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/DELJ82001986 — a six-check JSON result.
Piano Sonata No. 14 in C Sharp Minor, Op. 27 No. 2 "Moonlight Sonata Mondscheinsonate (1st Movement)": I. Adagio Sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff49a18612d5783f3570b355089b7cc67a2db9c532940210daa88346cb8435a. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/DELJ82001987 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9d984092308548a2f4dc32f6f87637b6cc3b1479f2e36775b19b73c61787a9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DELJ82001988 — a six-check JSON result.
Bagatelle A Minor, No. 25: WoO 59. Für Elise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbd9a4e0d88653c7c204ed71047421101cf9b53448862e9d9d631cc6bc35961. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DELJ82001989 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe25a29ceea7e9ad9c50ba63c1ae3e03ce42a6518ca7578d6fbe0545b8e5bc8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELJ82001990 — a six-check JSON result.
Canon and Gigue in D Major, P.37: I. Canon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51ba01d56f03042a8e2e774aea593830e04c595f1e0f681861740346db2f5f4. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DELJ82001991 — a six-check JSON result.
Piano Sonata No. 14 in C Sharp Minor, Op. 27 No. 2 "Moonlight Sonata Mondscheinsonate": III. Presto Agitato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa108f3e0744bf74e865b70be5dc415c3f8f68fb8ec7b1d644106f6ead5cd6e79. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELJ82001992 — a six-check JSON result.
Piano Sonata No. 11 in A-Major, K.331: III. Alla Turca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e845126a23dbc8d48a625c95f25ae30f25200a47598b9c11e8c1cb262679237. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DELJ82001993 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5271faa31896fe1c03ec8fabf04d82b63955f271046ea524f86b9529712e096c. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELJ82001994 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5684bbb07c5d3cfe488c8a959074b094f4fd9add2ad2f296de8653f2e9d785. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/DELJ82001995 — a six-check JSON result.
Suite Bergamasque, L. 75: III. Clair de lune
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6611f05113bbd8c0e7daa887d8a980b9024979a0c229c435198335a97ba96ef. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DELJ82001997 — a six-check JSON result.
Piano Sonata No.16 in C major, K.545 "Sonata facile": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f69467198605fbf36be95210e16d49ce35ba8c81f80232ede49b7b1fc6deedf. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/DELJ82002000 — a six-check JSON result.
Waltzes in C-sharp Minor, Op.64: II. Tempo giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038d9cc9226860ca28d157f59b776a09b8f5f9464e7fc8829c97388d7d2cdc9d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELJ82002002 — a six-check JSON result.
Hungarian Rhapsody No.2 in C Sharp Minor, S.244
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661cee9c2509dcbd414098fd98933c70e303b5ddc143d4bbaa3995b9fe917965. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/DELJ82002004 — a six-check JSON result.
Sonate No. 8 In C Minor, Op. 13 "Pathetique": III. Rondo Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0500eab19eaa23fdb6a24bd911989866f5b26e3f61ac539b998fc55ccf62d36. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/DELJ82002006 — a six-check JSON result.
Grandes études de Paganini Etude in G Sharp Minor, S.141: III. La Campanella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742390d1b80dd011572146c0d01abb9fca8b323a22257d01a86a63f25a2d7601. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/DELJ82002008 — a six-check JSON result.