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 0xa00987cdca091d141bd6c18d204fadbb4f14d967fe9f0a4a556643771c50f37c. 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/3d27ceec-ae53-44c2-955c-c35c25297c4c.json and https://artists.proofprofile.net/proofs/artist/3d27ceec-ae53-44c2-955c-c35c25297c4c.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 0x7500313d619148a290caceb6971301c2999d44cd77d30791b76e372845a16a02. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/USX9P1371812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666789a217729bb56955f0fa644167ef27f1ab4e9505b657592d500055e05e50. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USX9P1371816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46ffa27b0564f8ea131bfd06fa6a50904c76cd14f5191af25cada238757fb26. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USX9P1371817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8fc360f1cc1238ec070cafd920c0676d7df0c7292a0cdd10ec399ae1128678. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USHM21899523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0bcf63ba99b1d6f5c04dfbec862d25529ee83a2e191934e8ef9891d97b9c1e. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/USHM21899524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4f066aee88eb25c6e0a2ee8540218ed42a692010a7f8a612f68b875020efd6. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USHM21899525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739483d7f9db5a0aab9ecc1d9c3fdd8a329b43b0c7ebf3623b70920a5877abb7. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/USHM21899526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e327eb04f70538a08670e227cd52a4b404d9d484c29875c75988542b5fc8d1. 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/USHM21899528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba24dfbb0d189572f8fcdce8f25e8634557aa9d3e7a84e85f164f353693cbe1e. 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/USHM21899530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde60180c27411088b21cfdd67fcddfba538042f86d4d98ed182705767096fbf2. 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/USHM21899531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677982d960c669d56bef9a5addf4c8ad77e0dd91732802b1d457a71d5e1d5121. 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/USHM21899532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e1fe438a6c32eb73e6b16ad7e25de097d16fa448e2828226eeda0e3ac77646. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QMAAK1971834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ed259e2f831707c5db2b47bc4468bbcb4a319dff69772b90940d636ad2bc01. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMAAK1971836.