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 0x5ae99253c682c1f73e4759e64c9846f127164e0993992c88b3200dc7f5bd12c0. 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/4e117cbc-8e56-415a-b934-5a56f199f439.json and https://artists.proofprofile.net/proofs/artist/4e117cbc-8e56-415a-b934-5a56f199f439.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 0x3861454e17fbaa6651e67fa1120b17989698f74fd6c80ae04487f20b6c5ddfe4. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTAZ2229080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae79a74b0545c927fbbe8f24d32ad3fee2a4f5ae7088153c34c32c9709965e0. 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/QZTAZ2265894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba4e50a13e3d2e208a616d2f5960c71586bfc198eeb10656eac6f2b2956a2fe. 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/QZTB22278782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005cd663cef05b94f7ada462d3c52933681a2dd444f6148ec9a771db79bb6411. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZFZ32309164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa845e81ed6d11aa36c07357371e84b13eacfeb352784c485760f09144d28d8d8. 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/USA2P2469521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c312b8b480025a1cc28fe1ac602d57464a1de0a317c12a494eb1784c4c11d1. 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/USA2P2467474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36800e0abff468983c8f9f7064257a52c9c21a7c476318faf8ff6dbeadccb391. 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/QZNWW2475233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8e990fd84d7fea4345eae099d86319245e73a7138a2ae85edd7d2c69874d95. 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/QZFZ72433497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005cd663cef05b94f7ada462d3c52933681a2dd444f6148ec9a771db79bb6411. 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/QZFZ32309164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3020fbc9803640a9cda425af52819f476a236ed374c2bb57d7e5b1923ec195. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6K2480920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3907971b29f8ccfb22752ba87645997dce449412a7b1898dc12f1d198ed5fe. 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/QZHN62458279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b799621250aeb84624816f588ef43a000720eb68934bdde8e3db8a68185d2da. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTB82380024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8427476e18315bffe91a942b72d6c28a9406003b78f8b111f0e46757d0785e. 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/QZHNB2319811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c427c1bffd664d272610216cd2d4a2e29930d87e223acf71b3afb024e9b2d45. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZDA72320789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb80b9033b5cdb838d51cf7e7338b4394d7923e4d7f4775983a6bd935588e6e7. 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/QZDA52316018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4786dcbfa65d451e76d3835b70dff6358d205fd0cbc4fbb01029c8e3673290e. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZFZ62321031.