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 0xcf8031e69a06a02c1a8ade0bd936079b599c265f91a73543b0bc0e7b550284d8. 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/4c374f83-e0fc-4f55-a850-ae7714410374.json and https://artists.proofprofile.net/proofs/artist/4c374f83-e0fc-4f55-a850-ae7714410374.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 0x1dd02ed3fd25b57beae93521da28a6d2736165d3b4414eac0637bf0cd07ea9a2. 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/QZK6K2484055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b142c7e1eee9ca95f6f06eae0f40ed45a964864f4b983eb8bd14e3b18d28b7. 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/DGA0Q2389304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f478a57dce95389a342ce32c0208d94adc292babda285affc58f6ba70de021. 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/QMDA62205168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1847ac0cf376b5d3b02832cbb9b5c6c3e46c3949ef7a23ff6ad94d28017bb6fd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAGH2242029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca9262c66ef627cf4cebd402b700ad40d05926a32c75ceeab7423ea12a4e727. 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/QZNWQ2463090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e825aa4b7eef009bab80729b520c44baa762298df35b96ffe6b02fda218a80. 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/QZES62484813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad272a80837b6189ea5f612584e6fd2bfd5538a0a81118c03b33940d351aab2. 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/QZHNC2328336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310708d9b62bd2e6a1c34cae6b1fe9675f3728cd4d47645b54bb64c9c4212dd4. 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/QM4TW2403162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f3dea9652ee223173227746a9e96a499c05d896ce99ef5c71c72dc0f95ba82. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QM4TW2403167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc62a43d5c220d0ffd58c9dfe2ca74e6b59089546c531c418432c6ef3e0c16c. 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/QM4TW2403191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f4b9a2f75b24dac8fcf899c1c9f91337ebfbd034c92c7fae085a80dc873777. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QM4TW2403195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff507557414fe166bd104a2371c07a69394e69adb1ced521fe9e4a8d5d968e7. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QM4TW2403214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72354a86c1f846883aa6fe7183d41bcb365464f9351e2834de2ecdecb225eb2. 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/QM4TW2403228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0191d1e96963547aadd622151db95367f06eda6c4e2af3df572850395249f769. 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/QM4TW2403230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878ef0331f89e219229c0a5177033b009a7f6cf7043f8a88187765a9cba33747. 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/QMBZ92470074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde810ef57c14baf5d05b12e1dc68de148290afc04ff77ee0801c860bd8fffd9c. 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/QMBZ92470073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915ff5f54702536b351efea76cb73438bdd17550a8697b484b44b834300008f4. 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/QMBZ92470081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9272382195677c2e79a1c36aefad8e20d0bfbe121db0823a0d03e0ed7172a970. 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/QM6P42494285.