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 0x908206e527cab28462485a010019f60c6e656b7aa64445eb06ecd11a50f4595f. 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/0506e7b2-c7d9-4409-81a1-7a26c66fb842.json and https://artists.proofprofile.net/proofs/artist/0506e7b2-c7d9-4409-81a1-7a26c66fb842.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 0x14ca66c6d04e15a76c3c97dca7c7ac8726053cab3ebaef0393ec96ad8b465256. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/BCBAA2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ca66c6d04e15a76c3c97dca7c7ac8726053cab3ebaef0393ec96ad8b465256. 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/BCBAA2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d317bb242e1b2135aec1212543716a53fc31af87e531f5eff4b07dbc0aa3a5. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/BCBAA2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8823ff1649eb066e28d85c2a36a351df7901ec46c6e5c82fc7b279e97a15700. 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/BCBAA2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8823ff1649eb066e28d85c2a36a351df7901ec46c6e5c82fc7b279e97a15700. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/BCBAA2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1fc46c13504b7aa9a9be01887de961978cea26b193f4e2f380c627a27e535b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BCBAA2000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7b5b4de25ae3de7ba21fea07294253d1eb3b6eccba768e80c4a1b45e1b3b56. 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/BCBAA2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd843d0996c0dd117da191616bdd84bd42f0ee8f6df834151c8e67a600e879e54. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/BCBAA2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48878777ed11fa8f9ef90192ca25633ba22aa3acc872f10ea373ef62fecf68f8. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZMZ92121480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d761551ac9600ba1e45a374f693825c85f978b7a85fbcebb72195b87c8e508. 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/BCBAA2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5186f713a170a1f200237e42f626477dcaa564362e3d179edac3a8596488c14a. 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/QZMZ92360825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86007531795bb1ce73501873d026aef03a1f0af6ad5610215613afd1aabddd1f. 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/BCBAA2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b90934ff85db481873d65631f50863a774dff669754958cce69a196923d211. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZNJZ2330316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49d256c9597b8a978378aaf938507d8f31d8994bed700476f7ae0c40d53696c. 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/BRUM72101683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19498f383e5d404720e12359da711d938e940fe82e7ac5ea0d2077fd69615bfe. 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/BCBAA2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49d256c9597b8a978378aaf938507d8f31d8994bed700476f7ae0c40d53696c. 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/BRUM72101683.