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 0xf8a6fcf39f0badf80d59a96b1b4d0762e5a66376742b50bd186d752272b8cb7e. 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/6bb419fb-e7a1-43fc-bc20-d203bacf2620.json and https://artists.proofprofile.net/proofs/artist/6bb419fb-e7a1-43fc-bc20-d203bacf2620.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 0xfabd413eb7411aeb283e505f4bb62665fe5cde0d2d5e022350cf4e35ba9a5687. 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/QZNWU2308698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a6063017b8e1339ffd73abf01a566d0b94c6a07cf58a515619a7056d74ad181. 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/QZNWU2308701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272a5d86428bea9d16290420d9114bdc224c88ead29b366e5b10fc0252bb7ba1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWU2308706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a21276fd03dae1cf29ce7a829f73d47eefafdf2d3d9fe0a421fcb3f8bd9fe9. 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/QZNWU2308707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401f43c35bd1342f34b3dceb45bd97b9bd2d1af62abe0d129dd693934454e7e4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWU2308708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3f448bca9eadd8761b650c7c6546945a91fc2c55718cb11833d2118617eae5. 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/QZTAT2322281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193f3130bf3fd2a22871edda2618d05e015afce97c3ef9ca3e72b75278e9201e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAGQ2290908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994a2b92618a71b842f7c67eef05db5c778d75c1e416cb1aa13f4a3922d14a6b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLRD52354228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944577afc2c893e9fc3a6f9c5a92caa4e0823c02689081dcd21faaa48dfeeb23. 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/QZZ8B2396466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7d3665c09127d77be72681f0e7b862ecd4a2e8ebe41b8a4448ccd2b1780a13. 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/QZTRX2372982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b249ad5f26e97dc28657964729121d9fad796a31b488e0459f6dbe708bd737. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAGX2385330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e8a3d7888cf6ac3ba75de49d1abe976b6aa5fd2f31c8a9ea2d2252d582e521. 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/QZK6M2121655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23a02fcd588d250cbf99b67a2c2d7ea6e0d2e6057cbeb075c665598604b3769. 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/QZTRX2495588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc198dd13a67c86fb36d276c683041faa49632260c8d863fc3b012bec8a60761e. 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/QZMEP2386579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc9cdece37ff86faa64a1aca23f122e4f39c0071a9b05058b38fd399e3c760f. 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/QZWFK2380409.