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 0xcf24309752c1982baafaa63b4c14f56d04b2792d1cb22d2d1a404da119a0453b. 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/1cefcc08-6861-4a57-930c-247bc1a5523f.json and https://artists.proofprofile.net/proofs/artist/1cefcc08-6861-4a57-930c-247bc1a5523f.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 0x839e00f0bfc647c8aab98efa52641005a2215794854b100a7b1bc36e318e6e47. 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/US3Z42102853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb481468e07dee6e1f2c4fb3531ab28da176428579620c5fc464a7722e537ad33. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/US3Z42102408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26382e5aa95b688209b7cc56438a6f5a8d09e15afe45f72cf74e6584cb92f5a. 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/US3Z42102416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3dbcf178e66cd5801cb0101957816375f13a0767fb1bc392d966a93e139ba0. 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/UKXN22317495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993b8005108ace5685477837ef2916161b14b57a57d12c455333d44c0d022cf5. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/UKXN22317499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f6710ab8c28e6a7e1113fa533ef0d56a80d15e474c96663655ff230d8bca49. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/UKXN22317503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9b4d37195f9bd3f276edea47c84da9f00d32f8b772ecdd0ceaeebcf00e0dd8. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/UKXN22317505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70291bdb8230e2b9e2f0f357585b65766aa25cbaf56aa8c2f2c975fdff5cf224. 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/UKXN22317520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7720ddae4d4493841b43935564cbbc613935049be2af450ee8037e6e4ad1f9. 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/US3Z42102410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1397d400b732df660293bb02634b2b9e7e5b5819d6ba533832d93fcea780e9. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/US3Z42102412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd467050f8ba0098b67b5c780eac5e1324a57c7cdef15ef10cc679c042e535f0a. 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/US3Z42102952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5fe563f92811051bb68800e6307978b38b28e37e73388bad249c36d3a566b8. 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/US3Z42102776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ca1d84b03c3b819a96d6e322f16697d87b82016cece2e6ae08ff339db4192d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US3Z42102781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4764bbb74278be3c248788a4455388e85d7db34f6d5532e6e285ba32d182e5. 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/UKXN22317510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6185f2af44262a4332bd2e2ddc35cc809c6273f93e28ac17a7d54021eaef3f. 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/UKXN22317511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97939035538c311ec45ba04e56a460995383c8a09211dea5b38434f6d1551215. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/UKXN22317513.
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