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 0xaa0adfe8e48bcf203998437bb7718f6cf523dd953905eab6ffd4569f0fa76b08. 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/a5739791-2305-4b69-af98-c4b691e0fef7.json and https://artists.proofprofile.net/proofs/artist/a5739791-2305-4b69-af98-c4b691e0fef7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Saint-Saëns: Cello Concerto No. 1 - Franck, Fauré & Poulenc (Bonus Track Version)
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 0xfc73dbcf6ddd606927c2094775086740b1e11b50e82f6c0d457d3e0bc3ca6d3d. 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/FR7JM2246010 — a six-check JSON result.
Violin Sonata in A Major, FWV 8 (Arr. for Cello and Piano by Jules Delsart): I. Allegretto ben moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62643b2b84970e4971bf108d865ced8341ad9fcbd377774753482c1e5218c0be. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FR7JM2246020 — a six-check JSON result.
Violin Sonata in A Major, FWV 8 (Arr. for Cello and Piano by Jules Delsart): II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa528173a1b3b2dcd6ca58682fdc5cae673ada0cca26cbb2d461fc4688d3af7a9. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/FR7JM2246030 — a six-check JSON result.
Violin Sonata in A Major, FWV 8 (Arr. for Cello and Piano by Jules Delsart): III. Recitativo-Fantasia. Ben moderato - Molto lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86d6ea5322eec09ae932370b3acb97a2f959bb74595c78832d4dbff3241b01e. 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/FR7JM2246040 — a six-check JSON result.
Violin Sonata in A Major, FWV 8 (Arr. for Cello and Piano by Jules Delsart): IV. Allegretto poco mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba65520dbfdb4be007b86e934c30053e482eb964ad4f609ab7bc4b1c4b44c9a. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/FR7JM2246050 — a six-check JSON result.
Cello Concerto No. 1 in A Minor, Op. 33: I. Allegro non troppo - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959f15643aaaef47813c7e5140db77d2a24eb650deff301c2ac4687b9b086038. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/FR7JM2246060 — a six-check JSON result.
Cello Concerto No. 1 in A Minor, Op. 33: II. Allegretto con moto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028a3642701a337d03d7e113af7b2159af99893a89ea7c4fba6fc273c0012e60. 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/FR7JM2246070 — a six-check JSON result.
Cello Concerto No. 1 in A Minor, Op. 33: III. Molto allegro - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42993d803d7a75d6a5268de67c92432a88e4b305fb92101884d1c2e5ab467ff0. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2246080 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b91084769e2580ec04a5fb26acbb7da139c0f19a5c202c1d1f2ffd947ada61. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/FR7JM2246090 — a six-check JSON result.
Cello Sonata, FP 143: I. Allegro - Tempo di Marcia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c67deb0a45fc9140ba9e084febd7f1ed184bff7075f0ce53146da5c66a79fa. 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/FR7JM2246100 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709d6f45e92e747c6337aab78d8b788df67a0006c153c245f0f46afda77e2fbd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2246110 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf7f11332424300cfe759a73fc51111bd8592350802e19942e6cbd78c471758. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2246120 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0e64b7c22094ef42fd22b2e543d82ee0535cc8dbd776ba293a0dd66efe921e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2246130 — a six-check JSON result.
3 Songs, Op. 7: No. 1, Après un rêve (Arr. for Cello and Piano by Pablo Casals)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe9650533895cbd975742540aff7157c055aea83dcfe54d5aad4bd5f006373f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2246140 — a six-check JSON result.
Le Carnaval des Animaux, R. 125: XIII. Le Cygne (Version for Cello and Piano) - Bonus Track
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb333588983f5b0b7e1c1240b1cfc4c379c9abbbbafd6322a2a9166d41979155b. 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/FR7JM2246150 — a six-check JSON result.
Sinfonia Concertante in E Minor, Op. 125: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ffd221f71e8606560cb8b4f84c5a9322133a5b729e63e31b8fc4dbf8cb3436. 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/FR7JM1834010 — a six-check JSON result.
Sinfonia Concertante in E Minor, Op. 125: II. Allegro giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3117e9e191f5493706c712b522059f4be3502333e4c5799461e3d3b3b235be96. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/FR7JM1834020 — a six-check JSON result.
Sinfonia Concertante in E Minor, Op. 125: III. Andante con moto - Allegretto (poco meno mosso)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3789e1e969f359d7f98394b9aaf1bd3fc3c6e914e5557bb06b2c3606343dc6. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR7JM1834030 — a six-check JSON result.
Sonata for cello and piano in C Major, Op. 119: I. Andante grave - Moderato animato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604a1b275e8349dd06c9bb187698751a9db2a76170f4259be97cb2e6398ae67c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1834040 — a six-check JSON result.
Sonata for cello and piano in C Major, Op. 119: II. Moderato - Andante dolce
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f118a55184a47705794c4fc7178656da1d431eebc4ecdf25666bf980ae611ee. 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/FR7JM1834050 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22b671bb45bcaba11d705b848d918478dc4b982fc580102bc932db24e9c8360. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBPFW1700007 — a six-check JSON result.
Berceuse héroïque, L. 132: Pour piano. Modéré (sans lenteur)
Debussy: Les Trois Sonates, The Late Works
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd5079612f407cd205dc6e61d294bad68b5bb72dea13ba2732800be0ac5b3cd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1740040 — a six-check JSON result.
Pièce pour le Vêtement du blessé, L. 133: Modéré
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417b56c14574faa4bda32964b29f2e1eb158777ae2068e6a46a5adc14549e3e8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR7JM1740050 — a six-check JSON result.
Élégie, L. 138: Pour piano. Lent et douloureux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cdd1229ac2820078e30643f8584e54e37d633a25ccb0c2aa22eb216ccf9a09. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1740090 — a six-check JSON result.