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 0x23fae3d4786db8eb2bfd5d1bd143fb9fd31b4339c13db7156bd48edca8b4344d. 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/a47d9b9e-521d-4b7f-bc1d-a4745cad7598.json and https://artists.proofprofile.net/proofs/artist/a47d9b9e-521d-4b7f-bc1d-a4745cad7598.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 0x4c2375de4bc0ca154047ea85061f30e2d8101914beb9ed200f2faed08628c6a5. 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/PLB231301745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9040930157cc95c203f33aabcaade2e04ed16679e3e4a0408ef754aeed53e088. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/PLB231301667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4dc5b870ae016dab6917c3b52a8377eb0ec80d5779635bc6cfba562e3b8ed7. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/PLB231301671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9a1606f7604443009084f253d0b1c4aaca864844a302361e4466d31cf44ea2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLB231301674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5329ead543b62b14507b1581776465c5a6f2f41e071efda532668524965bc3e. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/PLB231301675.
Zagraj Mi Muzycko (Polish Highlanders Music)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960e42b0a575757d84d3e210e0e0a3140de5fc1d39dd99beaa34a12e72bf3966. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USJSJ1025909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c9678e844b2a079a86482865f7d43cb81be444e613b498366ffb3bbe35e1ee. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/USJSJ1025918.
Zycie to tylko chwila (Polish Highlanders Music)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09516043f724d799b05ace7849e7577e7f1cb0427603f7b78358873811b0cd76. 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/PLB231900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be3bb5b53f9c2b924caf124507af118d899c7e889166fb68158452d8cdf9561. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/PLB231900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f64c035d3025a712566c5a81f91182911241df92cf5531213a98503e50542d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLB231900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f68e2b855c0f0f135a647056c64833fe698b1cbd67655504f47afd63161736b. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/PLB231900014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e29042c4baf7c4fac8aa94413bc50aba14f99e8ed01cfb6d502f296aedec056. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLR862000292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6bc2fb6893ac6d33c3284876bcbee37b5fd9c856d809d5b54305365a1ab013. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/PL0B62366368.