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 0xaae97f1f47d73825cffb81c4c3ff62352dccfc75b3a0ddf79b99d832ee904c5c. Chain 2 (Bitcoin): anchored in block 953854 (2026-06-15T23:16:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/026e7889-c266-43ca-bcaa-fa16a084d84b.json and https://artists.proofprofile.net/proofs/artist/026e7889-c266-43ca-bcaa-fa16a084d84b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
2 Aires Candomberos: No. 1, Nubes de Buenos Aires
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 0x66774904db0f2e027c4bf876481a0ae50ffb4a828f09535c959db421b52735b0. 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/US8272200376.
2 Aires Candomberos: No. 2, Candombe de los buenos tiempos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496386c0e0ff943447f75cb82eaf9aea9d2c1230799f3501cb294a7e5ab66a7f. 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/US8272200377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30b8ef88723ef4137bfda2ec4fd721b03fccea8c16c92a7f63a38746335af3a. 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/US8272200378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a83eb152290302e6146337fc66570aadc3b2b898373d46e4267c2f85cb173e. 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/US8272200379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c0a27675b8cae79afd13c6787127e7ad38fb156062b4298737853ed0177ffc. 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/US8272200382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47ee4352a423171692d1d9b0d11150f2e91e6d5ae784238130523a55307df63. 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/US8272200386.
Histoire du Tango: IV. Concert d'aujourd'hui
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb949d084d84f89c70c246235d688ddb23a0fa9d4b73a3abfbc744007bddc4d69. 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/US8272200390.
Hasta Alicia Baila (Guaguancó) [Arr. for Flute, Guitar & Percussion]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6b9fdc8a66a86665182d92c82e121f139de28648fcd4ae705f2b1d760006e2. 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/US8272200391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9347c67aaca97c116d3875de436265749fa59f0a16a7deaedf4e1beb0c24161a. 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/US8272200380.
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 0x3468055473d21f326b479bd667c586adb6713e4eaaf463c046215acad5980006. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/US8272200381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5118e0a580b59e77dea3f873f16688f7cfea92dbf384ae1450b366d238438b. 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/US8272200383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf49e004e6a9903f9be6e65306477beabf2283c80c5cc6a19abbf8a753c504f4. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US8272200384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79e0be42f81d7037b8a9b524af5eb6bfc8059d178c7f9be735688e07a67d11d. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US8272200385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a559b8054e8b665b6d7fe2ca1c46def204127c0c84cb0c54bf725022457c54. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/US8272200387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8befc36bc4282458648d45a182ea77a2607c0f2c1022c78d0775e90dd43d7e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US8272200388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32857ca978f6b482bae257a7e4c2d9179ab980546c0666f7c2fbe5a280a43349. 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/SIA0U2000047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfc6c4da20c35bba31adc35a4c1166963e5930398f5e694dc4cb8bb0e0a9b83. 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/SIA0U2000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f1b0363ea84dfcf1cbea02d00f52756f948bb56cafa8c786f2a5dfa61a03dc. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/SIA0U2000050.
Rhapsodie: 20th-Century Clarinet Classics
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9404beec310f57c4b7625169f39dc66d374220424ba8e6ffd404f195da45178. 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/GBELX1606300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cc9d62f7ecb121bd50dad052433fa2225239f2975f075796d4c56f67fed1f8. 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/GBELX1606302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458d5fa44b52e799820aea18e3a2ed37579cfbed790bc3a32603e50d46dd19e4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBELX1606307.
Vocalise-étude en forme de Habanera, M.51
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a08e319822e6c8389514c1693c4cc0c3a3b71462d27ddd8fc7a22047aa31bf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBELX1606313.