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 0x096360c43f01cdcc567037efd9a4ff68ee11b2e89c6b93937da295f106bb9928. 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/95eec4f3-916f-4e5b-a1f5-283776237caa.json and https://artists.proofprofile.net/proofs/artist/95eec4f3-916f-4e5b-a1f5-283776237caa.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 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 0xc0832aa01eb044c755d316a6bcc79d6002336d82ef20018696530963f2a0ddde. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/CZA231400069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013a2808679f315c4a65d0d783ba641f1bed4398fcc1a8d92f848a68119f7364. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CZA231400071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa249247a753d1296946b28bf9ba07a017ae9e595956a3eebd01558cca33d72d8. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CZA231400072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401343e8be454159ab0b5d758751216f2cdf5ccb05b0a69eb2c05b714b7aaac8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZA231400073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6082e80687157f00ba4e5d52a9e95bf9e088402acd6628ec86821feaeab5824a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZA231500089.
Variace na renesanční téma (Z filmu "Bajkeři")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa936753b305047283f4f72ad305ee18ff676aee683f4da6db63d56faee6d3f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZUM71700358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db94a3094b870546a858a156ca44eb860e5e545f4a3ffa3cd954c182ee8bfa5. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/CZUM71800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6502613702f07c65a887a7a307329a0d196c0a211fa77694a292a2fcff062cd4. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/CZUM71900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123c0f9223ac7f226549797f9eb18b49e292a854d908eb7dba9277311a46a02c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZUM71900524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e2744c97028cb80a3ed8ec7063e62d56c75a4a9cc9c8bfa4eeaaa8344ae8e1. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/CZUM71900526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110fb4e36e406a761289d3fddda7e9f2de8761f8460155a79357feaeaa7cfdf1. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZUM71900528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5543eca9aaf1724441f041bb827118e7b89dbd2b4e0f280af54245b2777d3dd7. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/CZUM71900525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd61c55aa31d3542465137207bbbf3affff7d46ccec1ca12b3c4908c001fb234. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CZUM71900529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c320f6176d86c9701b7779f4ebdcc65567451f095c841138fca4fe0a5601eda. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZUM72200846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b099432143e3cf984728f44daaf7112933a5f54be0e0034c3cdd713b992d33. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZUV72200875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857571b065af13a269f005ffc14e081811724fafa642c1109baa0bcd8281745c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CZUM72300149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b8fc95edbba1b4c8a834d5dbf4672a097c26bf6a6b514c491973fb927ee163. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZUM72201209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d56bfb863f6bfdbfb391ee09c3283fab8f5f528c2864fa9823ae4cdb5536d10. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZUM72400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021da37c7d5f9dcad81e056e27651c4de037b91ded98f699a4844be194cc70a8. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CZUV72400338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdf1ad02c2734a4515f6da09f863ccd35ad5aec3e8d95c6f5fe2e1cc83d827c. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/CZUM72501027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c2141d047867604dfeb4228aa9ed8945e4562fc4c519384aefef4bfab8e56b. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/CZUM72501070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf8c311bb43ba0e6503c1b88eb6833c637268736d6c7faa8c48f07d7b590a9c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZUM72501071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdf1ad02c2734a4515f6da09f863ccd35ad5aec3e8d95c6f5fe2e1cc83d827c. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZUM72501027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90717e76987a7ff61360aaa3856c59f7a12f6ad0212856eb91372047dcbf97aa. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZUM72501076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a07daf361b535d3b2e0c2be4523857a33b3378d677e99c5b7ebb9d8705f195. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SKA012300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62435119daf79c9b9bdd7ab34a53669a16d18bd59d6d26a9b96914c9c87ca90b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CZUM72200317.