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 0xfc705cc673d71fede6e305fc05d3fc98b89ce3922ad73be4a2c1682ebbcd3a7e. 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/20f6cc10-0db8-40f7-88e1-1bb646571f6c.json and https://artists.proofprofile.net/proofs/artist/20f6cc10-0db8-40f7-88e1-1bb646571f6c.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 0x82afd203f35298b8aebda7fc91153c11b2507aebb9c0f269785e9392847bb159. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/NLH4D1960002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffee6c64d3ea776846ef5fa2a0ae58fea23ae8ace07ea15d878690a93c8feac. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLH4D1960006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1c4e15d5f06b0652da75bfa229db6297ecfe728489c1be089f36f947d1e6a0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLH4D1960005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f61e7f4fd489cef018ff633be01e840c30f9dd1b1665b341ef4fc789598b9c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLH4D1860002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2e196b97006e5fd935703542f4a6c74957133c3e276935898d7266bad07afc. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/NLH4D2060002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f019e728a94e531a5795f5a130d93c1643a27c634fc1254206533d0b8d82aec. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/NLH4D2060003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d98dbd2e91f4d6dbfbbe9a257a526675de5d1abec7493ed9cb32a6e25d21a52. 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/NLH4D2160008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619e25395f217aa1cb26723f8d655605b2808926c6c59a35faa47e5b77cbcf82. 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/NLH4D2160011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d23306fa0a3c84700714b863ac0442ba47babc0ae54805eb1f12c18aa7ad66. 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/NLH4D2160012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1a215047695574e81b5b3c6c59e0e6dc2413be07f6c6e272405e37b9a950e0. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/NLH4D2160018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90eb841888ce92f1ff2004fbb7eb1123131ecdc117f3f2c348560e5fd45d828a. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/NLH4D2160019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d673fa299ed58f71da5ab6776268aa3e43d94a53e4822ad42627fffa0a88ad. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/NLH4D2260023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce6526e8d1c8167552d1123684a211c5b51150d75431862630e4c5e3699cf9d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLH4D2260026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d72b8fb3637e2452692065b94537fe7c5c73f09fe8eb34e9c2325f2e7c6608. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/NLH4D2260024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b12d73dbe5c58c7c7fcfb689e3d6a75a8f570b791ebe92228df478dbe036e12. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:17:59Z), 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/NLH4D2260028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a4211c85c2493658987f5c50a193a766449bd04fd9496093562f1770d6f569. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/NLH4D2260030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7b38db642cac2bc500ace4718820bec0672cb6b0a4f10d948f9fadd0401ec2. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/NL4HD2360003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a4211c85c2493658987f5c50a193a766449bd04fd9496093562f1770d6f569. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/NLH4D2260030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5cdfb1eba0d921a59cb4702a2d7d8a5c765f239db153181bff5513f58c3e8b. 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/NLH4D2260029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3c2d45ea961b29e774a1464d2bab61c6de8c8926d08a6e1fd099a4a60d2e11. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLSU32300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfad4cdb1071314e4aa80f23f4ad76a6436596436d9530a402190a4ff07b7a4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLSU32300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcee8cf1080a71ea76dcf74d98dfe4e3d93768789727049bca3c03509c196cdc. 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/NLSU32300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679778d7568ecfea76dc429c24c2605b7c49a89823e3ae2c75b80eb06a21db0e. 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/NLSU32300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf29b6416b425549b69248a76c3a017d6975997ca78bbdf40498493e2df9723. 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/NLSU32300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d9f29560c58068c1f3bb27434ea3d3c5c1a892c62329646e4caecb3693ffcf. 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/NL9ZE2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65bab737251a5aebca800931fe26140cfd9c09a8466295898480b3abf08a5b08. 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/NL9ZE2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95084cf26073c842de95570fa50415e8e6604dff8fb5830beea4bccb2860db8. 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/NL9ZE2400011.
Beste Zangers 2023 (Aflevering 8- Duetten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf29b6416b425549b69248a76c3a017d6975997ca78bbdf40498493e2df9723. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLSU32300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfad4cdb1071314e4aa80f23f4ad76a6436596436d9530a402190a4ff07b7a4. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/NLSU32300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf29b6416b425549b69248a76c3a017d6975997ca78bbdf40498493e2df9723. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLSU32300041.
Beste Zangers 2023 (Aflevering 3 - Marco Bakker)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfad4cdb1071314e4aa80f23f4ad76a6436596436d9530a402190a4ff07b7a4. 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/NLSU32300018.
Beste Zangers 2023 (Aflevering 1 - Douwe Bob)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3c2d45ea961b29e774a1464d2bab61c6de8c8926d08a6e1fd099a4a60d2e11. 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/NLSU32300002.
Beste Zangers 2023 (Aflevering 4 - Duncan Laurence)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcee8cf1080a71ea76dcf74d98dfe4e3d93768789727049bca3c03509c196cdc. 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/NLSU32300020.
Beste Zangers 2023 (Aflevering 7 - The Power Of Music)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf29b6416b425549b69248a76c3a017d6975997ca78bbdf40498493e2df9723. 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/NLSU32300041.