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 0xa98f5edf47b536ff596a8485fc2f7c8745dd66fe5ee71cd5bce9d171fc27e9ea. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e74cf67-cf97-4864-abf4-622072be7465.json and https://artists.proofprofile.net/proofs/artist/8e74cf67-cf97-4864-abf4-622072be7465.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 0x624b5612c3ba176495afe18201972b451b2e604cbcd41fb7a7e4f1a626810d50. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/NLA802100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fb4bb76b0306c2a0d790fa63095be18980e9b3eb2bf9735d8a66782708a90b. 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/NLA802100027.
Kinderliedjes voor kinderen (Nederlandse Kinderliedjes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae066c0443c0773220e58c6b6b3213ed128a9098748994b5a0fa66dd5850c15d. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZXLZ2373613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f827ac2758b711a2598e76d30b6e40312e8606531631c01e87f240cb1424ca. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZXLZ2373616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa014875b3e7ef90690f32592a49c5a39f0950004dc20abc5b0ad4e03496dd2e3. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T09:41:48Z), 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/QZXLZ2373618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde10eb7c41556a04e285b9108275502fb6671804acc21eaa10728329d172ad5. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T11:06:18Z), 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/QZXLZ2373605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19cdf8de5061941ffdeb5395853df0cb7e6bcf8148f3cceb3150cb4eabcf5386. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZXLZ2373606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2998348ccb7bc6e033bee81f946ec2b60c711459322ba48bb8b4bfd748ec5bcd. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZXLZ2373608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f4dceec11eb16ba3faab1f81c7cc762944fdb645373eaa030d30d63f87cf42. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZXLZ2373609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16f8a7d032e19267ac1ab56b5edeffb9059a637ef0854f216c5ba12999e6318. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZXLZ2373603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bbb76a3e31b0ad0afdb588b00a496791b3e2e3042a3a95e291ad473b65e131. 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/QZXLZ2373604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5d2b975a6d3d082db4ea9b1789bbdd649c6b2bf433f0d901c0a9e3b7bd7c18. 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/GBENT2005936.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8551c0c8b50601722d0015cc57150825b67693c0d3fa366f6a5dfb67f7c2c2d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/UKZVC2969953.
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