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 0xfa55e03634a7054541054569d81fcdac5acc69e4fbe803b5fcffc02d9688a603. 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/04667188-3fc8-49e3-835b-c809d0136955.json and https://artists.proofprofile.net/proofs/artist/04667188-3fc8-49e3-835b-c809d0136955.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 0xa784586e2ff91a66c31f65b93115dbcc7d94f4739f591f35a28adc248de8995e. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/BCQ5S2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24dbe2b4df80b3e98aad8e80b8e42015a07d7755f11bde0ec329c5e343f2a4c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/BCQ5S2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb58618ad25f4be18cd2ca3ab3ce9da557c721ced72ba4a6ea94c91cbb60100. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/BCQ5S2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65de58bf76ded2cbca8e08019c7900893974899851e06fce163e87867598e88b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/BCQ5S2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca39255710d36dce4869992076ad7c241d0928e7ec021d9c535e57d3a4fa79e. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHZ32165384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa69357a4f4bbfe6337ca686c5dedf12400aeec8fe7834de953e20ad45f4030. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZHZ42186759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde72db150775771b150c381d10a4c771c540e6db4c02259ede87d0470031abf0. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/QZMZ92192941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8296efbbbae90284d8b938ab272aff2e2cacfe2e4510178ca25d15e8400b26. 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/QZTPX2119451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e6a89ed92f60a6489c9d9e28a3f309af7171344029f83af3f304c334499550. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/BCQ5S2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e82890ef8b3043558c4de2ec9cefdf39b1a984059900a7f1a2df21fa4b43b8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BCQ5S2200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1bbf40fc61a4a769b0de861d767a4348e1f7ec2a07a179502b2050871a1a66. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/BCQ5S2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266203af51334c854628edace35b1b159b81a72d49b890bc788560dd8f064796. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/BCQ5S2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6578b85ed5e9c47aeaa85669768b14aa5f17cd27c347910fc69d169ceaf1db17. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/BCQ5S2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b04c1de4b9e888f16d6acb1785244914a6156ef4149b146da54206500139753. 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/BCQ5S2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf082f59d5f3ab4ad675e1221b83f2f3edd61c6e18d390059047d88419ad854. 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/BCQ5S2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c9f3dc341a2c129d43e5a6af545e63ca8aa75954b92e1929f04eaf22f0927d. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/BCQ5S2400004.