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 0x8d0a1cfbfc3e98958ef3cee3d755034ddf65df5b12cb3602e4200de8d4dee57a. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ef07eb0-e1a4-4c0b-a509-cc23e0fcaca2.json and https://artists.proofprofile.net/proofs/artist/2ef07eb0-e1a4-4c0b-a509-cc23e0fcaca2.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 0xe01e9d6f6f6a6db7134d3e0a700173736282b5a826921bab77932668409b5012. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GRLP11901771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7b32e6ae65f8a787e0eab6364c9f51c2ad1ba38a5fcfcf0a27e9db6b121afc. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ITI952000100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79909ebabdb9cc5ca020bb94c8ddfe9447c4768289fc969a012f6b693408328. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/ES5702200104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81af4359c421eca100181c9e3b0de8691f79feeed8d4f0fe57d6ed95f44a32d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GBJX32363026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70bcd757b1b20fc48376f77485df22c6a91bcc9d312f2a9a947a06c9ec0f805a. 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/UKJSW2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff14918f490c2754c3cd644164613dfb05229e69fc21036913e92711b0c5d1c5. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/QZTB42462847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6570799b411c8e5251fa31d03d732e54013e88a79fb807c40a9b8dda47514f. 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/GBKQU2496163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1446f0f57735974b55b443531b6068a0c61ad442b54a067ce117e6097817321. 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/GBKQU2496164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fe583a16050a66a86d78c5d59c321668b6e13c3b35c103345e68118526f333. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/GBKQU2496165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a663aa83a77616cc35c96ab7c810ff08162a1c529dc0009de46ca80b77e1b8. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZG2X2413997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e193b34b55c3181e0e84bcbca0007d2c63402ee0338483acd327fced4ba4bd. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ITI952500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1650d223cb867033953f4851062e0fdb7949d77b54ca03cada2d83b5548cb74. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/NLM5S2502514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6663e1a51bd30f40eaf7925f0cb489e78d909effe65019d25be46516814dcf9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLM5S2502516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45be1c379f35af8c320dfcab7e031223e7ffaf1fb5256ecf989806d24b96aa7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEH742010182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71c13f1e7eb8c6d490c2c456163c12ba8dbf497168e36c5980cdbe7fa388903. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QMBZ92494599.