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 0xf41208ce45b06006474d8b8c5b4f038f9ed85e8ba627bea15d87f1bdbe688367. 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/fd10f735-05b8-4022-82c0-b4c339e4b2fd.json and https://artists.proofprofile.net/proofs/artist/fd10f735-05b8-4022-82c0-b4c339e4b2fd.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 0xe4bb212a0a0ed96126ba48cf731847bf1d8df01699c360c9259b0e4e3858005f. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/US83Z2006411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6cb3bd6dc913387390f6acc83a5d6dbb8f5b80b45e98b42466c0bd2294619f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLHR22200896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf060f59db7dd8d6e8d037380879db716edccbc93661c1d6e73e109f8f22c3eba. 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/US83Z2240401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c898758bfb0f3c106cdda03ba0fcccbd178f7cf5f98cadee22e38907e54c94. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/US83Z2301223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8af2bf42137a1d8436cafec109f0afffa0b92d3195379f1f353f33d9542b49. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/US83Z2496879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f16e2dd96463f54856bbd49979f1b097f251cc10fb6745fcdb242ba1bb1346. 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/NLHR22401087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62d8d1f2f1b97ac6ae8a068805a1a1a93d8f514c46fb91ff2f08227ebb709f3. 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/DGA0T2409938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8115b2efabf79a5f3818d30b3ec2975d1fd4e7b937c29dd3ed7f892513edd8. 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/US83Z2508440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d46bd8bd83073b1ac086add7326556e01ba346e4446784e9c31bb0b837d25d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEY032502873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aca887cd5d2db50a6c28b90680fc2274bc3e07e0acd109d847d6e2331036391. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US83Z2517341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb405c70cbb95632934c4f84bd5d8bc9fc640fbb0074eac32c6a48e77ebbfb93c. 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/US83Z2517342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf4438f734ec04b8c488e2af78e9684558e1025eb4cdface7e302a986e32dcf. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/US83Z2517343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7517bedb02e4d5302e22a6071b37f702c435e055eabba85543181b32760a19. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/US83Z2533704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d264c3e608fa1f427501055adc0116cae064710f8448574bb1de5cc8c727fb. 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/UKACT2210649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91de95a5e1b497f3aa0cb1e90e7983182895741639388df117bdb4be551878a. 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/US83Z2340014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339b337cef2df8ba4d3f2331e7a699f8390345a3b5fcece12206f40d29a03b09. 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/GB5ML2300020.