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 0x1b7d35dd746a87deaa89ca58bf4d1d1feacbaec69bbf46f0abbb7095c1709a11. 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/655f946c-d5a5-4599-b66d-1ce7a85f7e3b.json and https://artists.proofprofile.net/proofs/artist/655f946c-d5a5-4599-b66d-1ce7a85f7e3b.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 0xe3cc277a07f1e64743dbc3079b03130d91574ae7510d024483ec252eef849774. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZTAX2203692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc332b78b3fc90155275b2f7e49f4e28b9c421991cdb16d2b3c64a1276bab7e2. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZTAX2203694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c971ba894aeb368dcd32582c21ffb398012dbb8ee03289f3b753d0a93fef9b6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTB72344969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e8108c7fdf42c41f0c7abcf343cf1cbc5212e0ee3abd9711ad295cfe86f128. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZTB72344971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b5ac9d19eb274a952c40ba35983c74807956b47c67f2b91b431aebcf1194c9. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZTB72344972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b763c4b0b0625b300844db47f6f6f9d190bd50b364ec305d49c1862115cd2f. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZTB72344973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663a6ee84893d20ff313c29998c32944301f513f437d6674ecf8420525ad5b14. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZTB72344975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50bdad4fbeed466593244820067a4ec89489c08be95a9c2687618142608eea0. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTB72344976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce308de1098386da202f4a796746c8deebb4b7e5b802eaaa1bc41fc7a283a9d7. 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/QZTB72344977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ce54c17543927a40d30f88f93221c5e0962d5b69616aacce4cecde427c7745. 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/QZZ7T2432912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bfa0387866d37edc97b08b7a6ce3325fea2f13c6d6d5f0a9295bf2298a0c47. 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/QZZ7T2432913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e935a3373d19deb399be417321fa859e1a2798bc5bd9579808213ca6a19345b. 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/QZZ7T2432914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7fbcdf76a086091388821c5a8dcb0debf3a80e4faa9cd6c60148cb0fceecf2. 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/QZZ7T2432915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9056cee449416ce0479e75e5f156d7a9fdc3ef63fbb4e2aa05f3f1b0f236f1. 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/QZZ7T2432916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8045443feb7632be99bc021df943d0a7a8985f5b23680b71e09a211788a8a6ed. 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/QZZ7T2432917.