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 0xa78bb85d3b7955c32f9efbdae994c509ba11763dca3dcc0ac90b1dc80fe08c00. 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/bb2523cc-9ce3-47d9-b502-9454162a6e20.json and https://artists.proofprofile.net/proofs/artist/bb2523cc-9ce3-47d9-b502-9454162a6e20.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 0x43a31bd6e60b887bd7a64a7b05230372311c7fd776bd07cb112a6cdf20046454. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZTAS2160852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562768504503f6edca53267c5867ea5ccf47bea7c7f9e8cd32781c4f327f0847. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAS2160854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a3cfbe17f579947aed4bf4b71a55fbfe4f209b439ffee13da90be01f73adbc. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZTAS2160855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c228661204f3664c085fefeee9dcc45de6b446762861f71c3d43ab5572077d5. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTAS2160860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee412f54adae620bdd5d3cb8ccbcbfae7a47cfe12bd1ff39679b615fc70ae986. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZNWS2294634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2b5c81b2c2c04a6b5f847fbb4fce686ac653ab683ef0a495e02b7c88e56a7e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHNA2323296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e9c546832ccea48d58c1db5b67ed0fd611dee3ce5b3c632dc270e0d71bc914. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAW2303500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79514b477955282f6e979110f3d325b06c34b89db27fcd441610a4aaf0be064. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB62561558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ee79affd75aace22d493b08cac65a56d2e6506e28c1f769a092b3b10ad4d84. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTB62561559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbf86e68de694ab2ebdf449e9eabbae477180c393cf772c306a5a82e0aca557. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB62561560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe603168cf98007408459fa838361f22c036a6cb37df616a6d4f88694a5a08dc. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZTB62561561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529a4dcbedbbc08f4c5aa57cba1d0493e3937780d55180515f928ffcc0d5f002. 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/QZTB62561562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb3052ee3867be009cdb9a19886897ae1eae1c46599d9d891327d90c0edae79. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZTB62561563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd336c398f6034736019f80868329367731a71e9dbf4afd5f99fb6e33350bf76. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZTB62561564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce329cb81fc88f1b483d4c386a6ec4ed9a17cfe5e52bc2c94651cbab1b383b1. 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/QT3F32530810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e2d30e093490dd720cb19de16c6a903573582a10ae6fffd2b6004cf95cad3b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3F32530811.