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 0x793d4db74a121687262d9d4ee01be73a96ed871adcd88aaf53f9183a9a252c57. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/64cda5b1-8f93-4d3c-be91-3e9a2248b3be.json and https://artists.proofprofile.net/proofs/artist/64cda5b1-8f93-4d3c-be91-3e9a2248b3be.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 0x73b415e8838d0bfca3db9d2c12dc616fe966ac08a4af5d77acb51d07112936fa. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/UKJ8H2307003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f4363374c302555eb838e076fc008f31dc018e9b2ab6a5ba036540fa45537f. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/UKJ8H2307391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce9f3c9ec6474dedd573c557bb78306264cfb2d7f9aba91bdfe6eeb2aef7bd8. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/INK782405771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27e61e632397a73df783accbc813e667dcab275d474b0809c6be7b8a9bd5cdc. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/INK782405908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491d4866a8647411500d36bea7d2cbeac15e0f5900bf2665ff33610c4bd7608b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/UKJ8H2405535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc448f571bb6471b25b1939a40bcbdd370e9c8fb5dead274732d50e9a14ad06f2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/INK782406921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc448f571bb6471b25b1939a40bcbdd370e9c8fb5dead274732d50e9a14ad06f2. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/INK782406921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4517dfd4401bab1d08c769d342ff8cb5cb7e8be23bb7aabc8179eef20f792b32. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ING212527803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4348b813fee6fd896e0a664b2858ebce0de7a983e04881b8737f0c2c2473d9. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ING212528283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d099b348b0eed9b5e2372a4043df7af68eaa7b551b32443877750f7e5ac0f90. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/ING212529741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3fb696cd55519cfd3f1df98866e463821ce6f105772a9b3d8db4795093d601c. Chain 2 (Bitcoin): anchored in block 957794 (2026-07-13T03:10:12Z), 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/ING212530247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ad06147aba2f908184eedbaa0f3332b9ef5c4309d4dbd008a450479c76922e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ING212534112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db9b04dc19cdd3afeaf671a657957eb8c71b07a25bee389dff7b1045c5f3662. 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/DGA082286234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf261c0076a8968b0d3d3f6be54a808aff228b40ce053ef077997369f635fec1. 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/ING212536050.