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 0x40aca3996b75fcaee7112378cc1427c037b9a7ef826cecf21149d47f1784975b. 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/5a4e5f5d-f711-4717-99f6-25a8e845fd2f.json and https://artists.proofprofile.net/proofs/artist/5a4e5f5d-f711-4717-99f6-25a8e845fd2f.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 0x08792a39bb8dc4f6c31911b630bd9b2e66da3c7d28c111d4ca55760663de1bdc. 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/FRX762072977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa191dbbf16430fd6cf7d1b3a3bb03b4267415fb3d7e1af1bbe6a318550abaa3b. 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/FRX762074404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7b5ea4c5e7ff44795ddc2ec388bb1080a4b86e790cc395b1c5a1ef7c640f53. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/FRX762074357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68ccce304926de369b9e05d2dec8c2dc4571f76b52831405d8690668ed2ff73. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/FRX762074358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc421f77eb0cde0667dc3f1e8452ba28326590b5314fb78c751478457f55094d0. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/FRX762074366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6409e573cb3c24472459c0becb28bb40271d7ca4a1aa831390f7a3d4300fa9. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/FRX762074379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2e7a1bbad3a01884774acc03eda5e487cd23fbd9e3946fcd89f451e2d49ba4. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/FRX762074381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60209da7759fa5bd5b4321834f56dda3245771f2f376c4982530feb5854537cc. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/FRX762074385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11705eb61f75601312b846e07df76b1f1a1110678a320a7976e47711ee1eb766. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FRX762074329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99306a8dd2fc6c6c006e060d7ff54695b99ed049500c43439bd661f6660bc5c. 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/FRX762074286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeba3868a658872cee9891dbe98baa34941b9706451f4d0782fb2247cfc08593. 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/FRX762074287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3643d2216941888a765668d6a18f0662672a60c604f4b7de8b0a735e6207aa. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/FRX762074289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9910f99c08f5f9ab470d86ed54794742230a8cc3263a14181f76c9cbb769d614. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRX762074297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1321372f00533978edcb8317d1adb58e10c8effcad22036adc55c751fb5c343e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FRX762074301.