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 0xb1e1eb9fb50225a2f1f0ed89087376b0ec5618cd57e1e883f6d43824aa6d462c. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa9690f3-8cda-4b2f-9bad-6a2315d6e5ec.json and https://artists.proofprofile.net/proofs/artist/fa9690f3-8cda-4b2f-9bad-6a2315d6e5ec.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 0xfbf35050fb5d461631052f00262399ded10ec7d8eb195d9b266e7741f0587c2d. 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/NL4NL2012661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f776638463f33cba1f1a7e8bad14ac10eff8756d7fde77ad60d2d3c0596a37e. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:41:29Z), 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/TCAGW2358135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8f261560c76fe6a9f4a25128f8c0deba7334544f06ccd7d9388026dbdb11c6. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/TCAGW2358152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a48349f9b696f744b3c376846f6d9a0bf3cb856f529e1ffcf74c675ccd0a76. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCAGW2358154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a7506dc852cfc9919cd48d2e0dcf8bb84e3fa2ccbb0f20ddef6aa04fc897f0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAGW2358169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8db5ba13e9375e55bd97851c288915b5e5bcc1bc8ae0f3fcec5c2afaad6bfd. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAGW2358181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ef20dadb04429d641e990b2ec686f230ef4899c83c065d7b387c7b61a4c360. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T19:24:40Z), 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/TCAGW2358196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb9a3e75ea8d960eca6afc5bb2282d55d3dc07d0e4fa446e95f7cdd79634efe. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR9W12544336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4d66509a161e65693a08e4d702fddfe28598d3c3c7894c6e2520b1a285d12e. 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/FR9W12544328.