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 0x40118d9df4c4d14b30e50f7b22c3cfa873c2a3d997e85a172eba29fd92b53bed. 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/fe0145b8-4dc0-48c1-abcc-a644eb499bc7.json and https://artists.proofprofile.net/proofs/artist/fe0145b8-4dc0-48c1-abcc-a644eb499bc7.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 0xebc74b878a7fc17167a26b5adf306278fde64eac9aff34badf6a92be3293b87f. 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/NGB5S2303277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f857236eee90e0596872d2c5a066847c957cbdd24b6a8fad1ec309990fe8c3. 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/NGB5S2303278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6933780091b84bf881375e7e14b298bd76cd72a3fcb629eb1b4ceb60b662f8e5. 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/NGB5S2303279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5318716b9dc811bc10c2e360c05bf81422548635c20dd057a3aed38ce317482a. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/NGB5S2303280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9bec58e140a9ae123fe055a48791744b9993f972d3b7b774123917cc73ce19f. 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/NGB5S2303281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e5d416f3954a6c82074abc78caa81f140863db43284a2dda997f837facb5e9. 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/NGB5S2303282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb82cf5c40084a2beedd3eefdd172f3c514df77d586654a7c2e1dcfdc6b224d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/NGB5S2303283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8642c0cf40d2718a1548f1847861538e34362975c9ac801a67b1bf362d91b999. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/NGB5S2303284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e7ab682c2eb1ec5893f1dffe5c9e2f6a84e600f070d1e57fc46a2ba384afa2. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/NGB5S2303285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4470d9d1d73dac38163244bcf6598c6d1eada0b8b6ea96e57067302d00279fa8. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/NGB5S2303286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d4fa45f9bb1c9983450119c43e88f3e1d360fe67624e643e5ac335edf0b937. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NGB5S2303287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0eb3393c5a3076428c88f45a6df1a9d128d5d5def81e3b7b44489caa09c096. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/NGB5S2303288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e02101c11d47214a41d7fa134df5a8c1ddc30cc4186d68bf4c548b7f3f4c09e. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NGB5S2303289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f10ab1d0bcc515c06d43dbc20898db50f4cd5fd25d010daa87ba2d7276ca43. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NGB5S2303290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad15fe6bfd201488f490030e665d60c21b7803cc41cde600c1d2648f4474a22. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NGB5S2303291.