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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 0x0724a069e7ae8e93718279ae50f929c9a87be524c7475f288baf57514f1507d0. 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/878c26ca-c90b-45ae-b95e-77fd95dd05f3.json and https://artists.proofprofile.net/proofs/artist/878c26ca-c90b-45ae-b95e-77fd95dd05f3.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 0x97ad9e338f7e5266488045aee972cb82bc244709a3bc15b060603d6ef2f4ae37. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/PL89B1900137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5fb9e40e462bdda9cea1838bcc6b0cc2e15787aea17a264b09bd5768c60ec6. 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/PL89B2000141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b60378f853f24d6dcc1c45a097e8da59666de9699019cad4afe6de04364f95. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/PL89B2000142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7748605451e8d1a511288cebe36973526095779ac5d758d1bf81f905741834. 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/PL89B2000143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d18d7146d6ffd444da5af49d12de0abec5f852fb3af5506af065e51b0b2a274. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/PL89B2000144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af0c9dc10a6a259d4cd008424dd60b148f20ae1489e8aa619930698efd89f71. 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/PL89B2000145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4efcf23bad90a03d4e0b855780de7659bb619ced2140459f5f265988069cd76d. 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/PL89B2000146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee75f6d1a87e458a649daa18aea5bd4f4871b2a70d2d894c3ccc9a826c684792. 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/PL89B2000147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad35186ff9855654db69398d3033af7b5b6eb542433b576e16ccbbe9d5a09ada. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/PL89B2000148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb50d95112b079d4a9858bd0025a2395f7d1ac976ed5f81b56c63febc27f72b4. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/PL89B2000149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd80e77888249649b5b399838975ea422fc0a86fddf49ed6d60d68c1cebbd50e. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/PL89B2000150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347a0f235a88910778698db7be86373765255d35f006eabc6b390ce826f31283. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/PL89B2000151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f487f88f3bbad5c9a304b6268e3c4abc1b655a7317927c25c8154ddc30ebd7. 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/PL89B2000152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf956e2cbf7b6768a3587b84ee3f9513819eb896de43fbbb1d7835fa88c59127c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/PL89B2000154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ebbb5287e4090b52dac23a65128713fafa49430fc5a95fb64cb191c834f071a. 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/PL89B2000155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f16fc709c1ff5f8e3c4eae26737448689190960d6c17a5d249d0ea954277e34. 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/PL89B2000175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8d63b0e52dc379d22b93b2b57d17695bb0c305cff0d9f381daf9fdf615ccb4. 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/PL89B2000222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50afcf5e5c610d7cd5741693def5f0d109ca5c3be00f35abd6ddad3a8ce307a2. 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/PLH441300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9d1c2c6f31c93dca4869d92c8f5b254f0b501d6457d8056d2e430a6781f231. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DEW270800693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec36f3abd2f164f63b755a613a3a25783822a599ec568d898c0a29e1e1dc8f83. 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/PLI364399530.