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 0xdcd74ccafd70a55785a7c536e86f9e69a7731b83ceb738b2af128f6b3d57245a. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7721d8f9-d67b-47eb-bc4c-0ed3382b472d.json and https://artists.proofprofile.net/proofs/artist/7721d8f9-d67b-47eb-bc4c-0ed3382b472d.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 0x36033a39b75076a97ad7de862b69e0a611b3cfbb12a1ac3c62e6daf69c769f53. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USHM82234704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ea940bffa2bfee4025ca6590759c69a65c556d7f1e6a23d4549c6315921e1e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USDY42176306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327749b85c3f3722c85d47a5904db4b30a6be028616890a43663b96e4709eb0a. 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/USCGJ1823136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc8af5d5551e93161fab9e219edf55d2ad8d1fb7db7287fe4520c6f26854259. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USCGJ1823137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7129a786cb102f75c3b3cbd415f72818e184fd5b645b37bc00cb0e385f31d11d. 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/USCGJ1823139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fff5b279d9d98f8d7ec43211c09c326164e645e78d0b182fead639ebd99c07f. 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/USCGJ1823140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ca7d21f4933894dfe5368cc704921e04479477c9b9fc8cd9f4a03d95e95fb1. 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/USCGJ1823141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d31623246e9feaddd5563993d9cd3b029f91e2916697e15b8717d6177cd7fb7. 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/USCGJ1823142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f90725a3ef7ca0cc5ae7b8601bb04ff1c24e4e7926e47de8714ce9638914e77. 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/USCGJ1823143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797cfe3b0fb51e5c577ad22c581cb098e1e535d8bb3b1ce3c5631fcc3898dcc8. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USCGJ1823144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d45850f2029fe50b92799a46142d791e650e4ed6436fcbbb945e0fc139efab9. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USCGJ1823145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551ad2bee90ee2b75b8e179a988890e2ec3e03e500616ebfa237e31b091ad305. 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/USL4R2147427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e02e0364000487c761dafab8492a725e9af9e94fa976373286caf0fe0922613. 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/USL4Q2119789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94e52fd0c6367b59f86ec9f6e6450773de128041e0cd7f183120a9f4fbc0271. 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/USCGJ2091998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5318e5d62d970a65f8b730a184478d5e6135034b8a4a08578e75564ce464b4c1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USHM91942529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7318c35c1c9969e213a9a2df05cf8f6a92766364689f0dcc6b3bb33e966354a. 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/USCGH1826622.