thumb|Fritz Kreisler, Harold Bauer, Walter Damrosch and Casals, at Carnegie Hall on 13 March 1917 Pablo Casals (29 December 187622 October 1973), also known by his birth name, Pau Casals i Defilló (Ca
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8191d1395c62b209265809a5c2d9e110b16a458832f3d70e3a45777658af98e9. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0bba1073-750d-49a4-90a5-f1a32c1860bd.json and https://artists.proofprofile.net/proofs/artist/0bba1073-750d-49a4-90a5-f1a32c1860bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: I. Prelude
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e0744deb9a07aabf8967574117c31b386e6cd27b2c95b63fe1494be3ca0a62. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1102616.
Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: II. Allemande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff5e8c981f6b0d13baa9fb7fd860cf14b8767cdef7e4ca517cf664d925650c6. 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/GBAYC1102617.
Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: IV. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc5f58b76d07dd8ed48dad3a60ae8fd1ecdf6b4574de47ce64b38f1ac118c84. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1102619.
Bach, JS: Cello Suite No. 2 in D Minor, BWV 1008: I. Prelude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7466a400396cb79320f830947c4c0274c50e94700cb59c0363bb6c263643d291. 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/GBAYC1102623.
Bach, JS: Cello Suite No. 2 in D Minor, BWV 1008: II. Allemande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2b91c7ada742424f3f5e01439104db21c2545654968afab7307337eedafb90. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1102624.
Bach, JS: Cello Suite No. 2 in D Minor, BWV 1008: III. Courante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda56d33c7af2734328b3e98b1f966045442a0f24fdc3aa30b9afbd1a9b3b6e1b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1102625.
Bach, JS: Cello Suite No. 2 in D Minor, BWV 1008: VI. Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63a1261bf773d6e26a22e41f85777e04a0a6310c26a0b51d9bed5181510293f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1102628.
Bach, JS: Cello Suite No. 3 in C Major, BWV 1009: I. Prelude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533528a95588781d0ef4f396876fd38670843e9cbe37c5455b00cb8bfdda573d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1102630.
Bach, JS: Cello Suite No. 3 in C Major, BWV 1009: V. Bourrées I & II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d67ba0fab97643a3ea23fd4403ace6fcc0edd55e5aa63f3bada6602cefcee1. 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/GBAYC1102634.
Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: III. Courante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f841d11685d193bf7bf7c922d60e5fd058e7461b852696827dc9ceb013b114. 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/GBAYC1102618.
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
Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: V. Menuets I & II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0328040a77980ed52f0bc6f0b9ed4ec6175dac762a19026ff10d00ba2b602c41. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1102620.
Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: VI. Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88171b2819ebb0f2ba78f3ce6febc12cfe613695f7ce446bc39881d6c3115e01. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1102621.
Bach, JS: Cello Suite No. 3 in C Major, BWV 1009: IV. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f878a7b13a25a5039525d73bdff5fd36dbbb896f8fd41d7e3e8f65d742e4f9. 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/GBAYC1102633.