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 0x2dec6aabd8d4d67d677c6535e8f37138cc6bbe9d946ecafc08125599ed0c8769. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd926cb0-39aa-42a5-bd90-6e2d973a011d.json and https://artists.proofprofile.net/proofs/artist/bd926cb0-39aa-42a5-bd90-6e2d973a011d.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 0x7727f1d6f507d0071e65c47b60f7ba41307b1767159aa1f2e471eaa981b4afa7. 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/TCAEC1977859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ac7fd7f0a8505c1db22190801a89dcab30247ba0658aa7f640e51f9343fb90. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA62139789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7063de677514003dc19d62e8195c435668f330a3716993396815b1baeec6802. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZHN72159031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d1c7d8e5d5109259e423350069ac8572952d1193a701f2f437f6e5a378e60e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN72159032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e864669c5ac81d7d1b3b3f2da80b5e318e3b0174a5275ecd8cba3da651d83b. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZHN72159033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c9906938a41126c5587b7a403df24397976eae756fb699428f28858a17c9b0. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZHN72159034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b26fdea20f81bf92f2b6d2a551a4ffa28d234117ce5e894d1270d78ebf08ed0. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZHN72159035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4d252dfab62d2882f2dfd13f861b5d62920cd249ca60a94a08612fded77eba. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZHN72159036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b5b05aac008b67baa4c90e8b19d84558e5f3e1ae4a15c705ed5fb72c608045. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZHN72159037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73843cd0651f3f04af399162f28ca69b01d800a6fc424fba9359641d4e962e2. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHN72159038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2768d0b9f3dcf8ebbf739db440e3bf727936f89d74b583be1ff5a03fc122651e. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZHN72159039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53cb592aba64a1f2a7825e4ce720634be9a92c72a6293faa027aa12d7067f69. 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/QZNMZ2341506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493cdb2cf09b064a9b3ceac687abd6e9199f468b520ec0e4ab1501761769c53f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNMW2421627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed32f88f0aad14f57f08f0f74a513c2531d4ea433da8a74984ae795a3ac145d0. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZL382570849.