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 0xa8b884a863fb78b8b822aecd0d4540e1c3a9509ace3a79926d85342777454a27. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c58ae8a-c9b7-4751-ac8d-37b21974548d.json and https://artists.proofprofile.net/proofs/artist/2c58ae8a-c9b7-4751-ac8d-37b21974548d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Weinberg: Cello Concertino, Op. 43 & 24 Preludes, Op. 100
Cello Concerto in C Minor, Op. 43: I. Adagio
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 0x9c2b2aafaa21210b134084ed0850b2d9ad0627c8995283142a09c83588eebab8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USX761883101 — a six-check JSON result.
Cello Concerto in C Minor, Op. 43: II. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9afddf27d0abfca2231caca5590ee23a242bc04a7b80ba0bcaa12574d62a1e55. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USX761883102 — a six-check JSON result.
Cello Concerto in C Minor, Op. 43: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141b595fe2738f434c635ae534c8a84f55d75932638cf9f920c5fc6d211d2a1c. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USX761883103 — a six-check JSON result.
Cello Concerto in C Minor, Op. 43: IV. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e4a886d1c3e1cb2c4600b48b2c68441afaec96ecb12bab9fe7d00b3b66f4d9. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USX761883104 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88eaf460ac430ce15b368465058c6447f377a13be3fc40e6fb34f475d6460372. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USX761883105 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48975d6b2c7cec1fe64b214e5bd8f8d9b96c56199f07d97e99bb16aca085e512. 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/USX761883106 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd561e110eca7b4c934ae12e816ec788ff6ce136fc114f4ef6f4b040697a94b50. 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/USX761883108 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84635dfb00fa0be08fe348dc20e4e4ea7a0f530879f0b570207b64ba396b7823. 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/USX761883109 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x396296c99ae01c546b1954145fdf6957b0d0b4df4fa718b5c03d3d15cfccea99. 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/USX761883110 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97f5ea273c4099a95c8528e873d76b691e68e926cd203ed325bd7042d1d0c0b. 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/USX761883111 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604f99da21032ecdef2c833dc6e04dff162d4b49c53c2e661263c721f409f615. 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/USX761883112 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5ad46ad4648b0b6f4db8a34bd4da7541fe340c22fca5211cad683a195f7132. 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/USX761883114 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d837bb875f6f997148719d03980f63cc55b8cff92182e91e25100600135766. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/USX761883115 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02539ed05a234a0f8d290df995ad19069ab0a46ee9b27344282f253c378ddda9. 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/USX761883117 — a six-check JSON result.
Farrenc & Alkan: French Cello Sonatas, Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c274a07ca53a1d59b74c5a4a1fc0c934b4bacc5f63b08c7713609b806832262. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USX782303001 — a six-check JSON result.
Sonata for Solo Cello in C-Sharp Minor, Op. 134 (Completed by V. Blok)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb2297e127101428052a29d3f23a1ff336c7074629e4af5739e7b5fcb3c3640. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX782303002 — a six-check JSON result.
Cello Sonata, Op. 49: I. Allegro con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38c62a4954e55b1be2aa8f12bd06d5917d7f3cf61cb2a56185ff49583696575. 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/USX782303003 — a six-check JSON result.
French Cello Sonatas: Boëllmann, Widor & d'Indy, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e720b16a819102ecb85efea56a3820fbe8da455f797a2b2757ead7e972b3248. 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/NLB152300123 — a six-check JSON result.
French Cello Sonatas, Lalo, Koechlin & Pierné, Vol. 1
J.S. Bach: Cello Suites Nos. 1-6, BWV 1007-1012
Brahms: Cello Sonatas, Sonata No. 2 Op. 120
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf017c72c5bc342774ff7dc091d215abaf1cb35d4e1e2caddbea36a8d0df75f06. 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/USX762094201 — a six-check JSON result.
Prokofiev, Shostakovich & Khachaturian: Cello Sonatas
Weinberg: Complete Sonatas for Solo Cello
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025b1098003928f5de77967ccb8854da6e0a8fd8a6dea9c18eda309c1785c5c5. 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/USX761939104 — a six-check JSON result.
Vocalise Op.34 No.14 (transc. Anatoli Brandukov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8491dc36cefa27bc64df4bc69dbd497ad495d6cf1fcb7bb508a60c836eed1fd. 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/USX761113205 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0489755eda40f25527fa799fab3c2a2b783f9f5961ca883e3b37d6b4e2b0b904. 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/USX761113207 — a six-check JSON result.
Khachaturian: Concerto for Cello in E minor; Concerto-Rhapsody for Cello & Orchestra in D minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d515dc37aa69b97566d828f6a5bcb24c6b9d65e18fc6e6673f1f9ca74059fb. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USX761011601 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e6d866a923ee63163eef9fde332c13e310470e5a16a975bb759b6adcd6c765. 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/USX761011602 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa697156ee78754ffe502de8de8475fe2dd6d5b35dc7c9a4ba35b7850a6a9642. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/USX761011603 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f39fa9e580fa4a5b097a6e4b226d7cb3ebdaf750b057d119217b3fa500023cb. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/USX761011604 — a six-check JSON result.
Marina Tarasova, Alexander Polezhaev, Davydov Symphony Orchestra & Konstantin Krimetz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b655f7d2ef5143f6b73b66d5137ba8bdfdbd641310023b54a714474157efb55. 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/USX761006601 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25489545f519c70a06789230580f06e39d84b1992fb4454f4165c1b42296c3ba. 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/USX761006602 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d6640e9eabda1f0443c1ad37b688e041eb5554bf91244bbd209d6fecb196cb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761006609 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72073714691cfb533e26b5efb11df892ccefa4319432f674796d81486049a6b6. 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/USX761006611 — a six-check JSON result.
Nikolai Myaskovsky: Cello Sonatas, Cello Concerto
Dmitry Kabalevsky: Chamber & piano music
Kabalevsky: Cello Concertos-Tarasova/Dudarova
Cello Conserto No. 1 in G minor, Op. 49 (1949): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044f393ce3be2bf578098687133e00b830a189912d09ea3c8ddcf9a2e4a44297. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/USA371002800 — a six-check JSON result.