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 0x4e732da8482e465d61f733b05387a4897c2f1920b716cfdb7a4053f49d76ec3a. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/07d2f4a7-9b99-474f-a27c-f8e47512108d.json and https://artists.proofprofile.net/proofs/artist/07d2f4a7-9b99-474f-a27c-f8e47512108d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x3ecd5b423b5b0a4067d8eb93baa0d454c002e1873850f3d5bddde8f54ba6733d. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FRZ130839010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523038ddbfd3ce708f26c2457c7a91aceed6bcdd8b15bf38241b50528adc5937. 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/FRZ130839030.
Jewish Traditional: Song In Remembrance of Schubert
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8387b1e03f6a9125497711c6795fac371ee417482392f2041ed7cc1a98ebebc3. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130839040.
Jeux D'enfants, After Janacek's Moravian Folksongs: I. -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787a91b02d22830f4478ebabd65abfbf6ca20159ba261e98592a0307989dc2af. 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/FRZ130839060.
Jeux D'enfants, After Janacek's Moravian Folksongs: II. -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c4b6236529d0bbf2cbe1c2e0868cce1082a4849800b4ac373b08967505f348. 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/FRZ130839061.
Jeux D'enfants, After Janacek's Moravian Folksongs: III. -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f9bcb6a0bbce19b0008625024c1126dbeb131fcf70790f1276047de42b7e14. 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/FRZ130839062.
Jeux D'enfants, After Janacek's Moravian Folksongs: VI. -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c507afded3e63643ffddc73e82d1edd7547609df9759843eb3f8971e5560a8. 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/FRZ130839065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a26892cad836e427c51fe28d6acd24ddc6b8a571907da4e3718f89e5409ec11. 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/FRZ130839080.
Variations On a Slovak Folksong: Theme, Rubato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1176976e6c98fc9a47f2b23f5c6ab6b0a274693d981159f714dfce7f99c1006. 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/FRZ130839090.
Ruralia Hungarica, Op. 32b: Andante rubato, alla zingaresca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cda9467836e67cce9b6135d0081694d867f7e0ab9b55d2f9d69b6259b6eac9a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130839020.
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 0xca15a75949f8391df4fbb819234c55a0729d659aefff5f8b500e6bfe74caa632. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRZ130839050.
Jeux D'enfants, After Janacek's Moravian Folksongs: IV. -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22921a98dd67efe249a1395453a16f51ce85ab64e548d757b9e8cc5c8846353c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FRZ130839063.
Jeux D'enfants, After Janacek's Moravian Folksongs: V. -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd0e940cad2b4fb1ad62114986b596a1f7603c5a0a6593f960ff594622ac774. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FRZ130839064.
Jeux D'enfants, After Janacek's Moravian Folksongs: VII. -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1600cda7dd40862feba9e00560ee8e65575e2972433142fd8e3755a74fc32b. 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/FRZ130839070.
Variations On a Slovak Folksong: Variation 1, Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8718ee37f5751552e82e8d75231f94374b115f564d74c096c9738440686f5118. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130839091.
Variations On a Slovak Folksong: Variation 2, Poco Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c4b4b0f5365009e28cd7428f1cb03208cbdb80d2317440be13f405e340097f. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130839092.
Variations On a Slovak Folksong: Variation 3, Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96503d400465ad35970a6f1b2b5cbfb4f85e9631c563e1d7ad0a1c2404242e01. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130839093.
Variations On a Slovak Folksong: Variation 4, Scherzo, Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517b73088614875d189df6877d69e472482c153c9245e412183a5359884d0de7. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FRZ130839094.
Variations On a Slovak Folksong: Variation 5, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd32aeda108bdb0a7805c43b9d3c4510c9470f6f14c82844fa2fd65b03207bb. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/FRZ130839095.
Rückert-lieder: Ich bin der Welt abhanden gekommen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61694cb6e357fb390ca75d3f08afdd5db93d1d622c4bb12c5339292b5de4a36. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/FRZ130839100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb99f70213d97d64893409413798f9d8a10729e80fd9c35bb80238aab7beb0c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130839110.