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 0x36434a56289ed5b796c06cba470f01ca1a6c4640ea54bd8fd6033e5f38ac01cd. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d12fabef-caa4-4b8e-a932-373a6e448f64.json and https://artists.proofprofile.net/proofs/artist/d12fabef-caa4-4b8e-a932-373a6e448f64.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 0x94dd1c5c293f243df45b3cef29c37a5ea09053a7ea9fab3232160c96b50a1790. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USMN22100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdf32335f58c45f186bdddb4bee5e0a1525060d263e58e4ab97f4d85d5fd8ac. 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/USMN21800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16866654e369156dac1f04499f96668e27fb89b323753f66fee7302d880d46ba. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USMN21800049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498ec11ec3a2f4f14dcfe8e3e30b51d5cd736fb8656d3364b220413fe0a1f1c3. 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/USMN21800061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e04efe17751fd25deb1e45d43cca05d9e28228fef32b3c8bb919f73533b5744. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USMN21800069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667f9614cc0981622baddaaf2868aeb227af9c19b11ef03002e4c3aa99e7d000. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USMN21800073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97be9fb1c16a8b004379e7a94c93a7fda2ae25cc43098ff9f9138ab516fe5db6. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USMN21800077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94dd1c5c293f243df45b3cef29c37a5ea09053a7ea9fab3232160c96b50a1790. 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/USMN22100001.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94dd1c5c293f243df45b3cef29c37a5ea09053a7ea9fab3232160c96b50a1790. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/USMN22100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdf32335f58c45f186bdddb4bee5e0a1525060d263e58e4ab97f4d85d5fd8ac. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USMN21800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16866654e369156dac1f04499f96668e27fb89b323753f66fee7302d880d46ba. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USMN21800049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97be9fb1c16a8b004379e7a94c93a7fda2ae25cc43098ff9f9138ab516fe5db6. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/USMN21800077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16866654e369156dac1f04499f96668e27fb89b323753f66fee7302d880d46ba. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USMN21800049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdf32335f58c45f186bdddb4bee5e0a1525060d263e58e4ab97f4d85d5fd8ac. 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/USMN21800021.