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 0xc2edb1a688e2ddea84b2e9c3c9cbcc5b17309d72ffee6a6aff64c719f3eac29b. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a8a0ac8-1abe-49c9-89ff-f08b519cf269.json and https://artists.proofprofile.net/proofs/artist/3a8a0ac8-1abe-49c9-89ff-f08b519cf269.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 0x3e8da3d6bcc13cda2ac0e0fafb76ef3fd5e9cfd868cf1096aeaf7694f965ad57. 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/QM7281532746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x741554255cd5052073efbea68b521204369bfd545e4374bbe284ea5842684190. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QM7281532747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369364d6746109bd1e234f374928f0e7245dad9249178f5bc468349addaea380. 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/QM7281532748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b87f55beae7984788f464972b81e4842b65f761af86707596e51c5c3b3fde37. 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/QM7281532749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89a657165d542668ec4ba04a98ae81d2c117d20f04dfdb7dcc3237870aaa7a6. 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/QM7281532750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c62ab6b80ebcd452566033e217b2e5125944533440d2d6386a3b57139a22fe9. 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/QM7281532751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af52c3f5ecd9e22aac4694fc91e287b2f133712e8ca3ebe23dc9415a3a8a25d. 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/QM7281532752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32dfbadf691ed80894fd2960305a6d2e53bbd5f920c066a1171f2570c185ea4. 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/QM7281532753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e9f7a3f2d0fb51727e14889e670b5bbbe68e8c76c0b788f01b0c1f5940d3c9. 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/QM7281532754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791420a904f3028cf821b17e335edf9dadeea2c01b8122da43f91bb4a3a0877e. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/US6YC2304923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572c4be0f5c0cd557c62bfa5be50dbe56df07b7db18ed56e421e97bd599ea30f. 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/US6YC2304924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19d52252f596102f00dd0d3d707779faf0629d7626220118003bd54cae4d0a7. 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/US6YC2304925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927688c6e673a841bb75adc05fdbe16760fc5e275000a2a00ebd7f08571c8a65. 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/US6YC2304926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152ba57a93503d3e23c253b3bdad47ad324e7a317debf56841fb3ef312f91043. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/US6YC2304927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c1d404e6a4a2b9dc292c2b4dd948699f1df58583499ab3a8bea3ffe76747f9. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/US6YC2304928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86692eb3c77c41d517b15d6e3310c17321d449f57bd73965a118d0ec0a897be0. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/US6YC2304929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84ec80c03fb355c37d304e7507f16c8784976e900d7387c96af76aee5cfeb17. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/US6YC2304930.