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 0x5fb6134f0eeabb8c1cd35d266815a64c25bcc738ce3a5798b4cd3c225e46c89e. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f4c78b4-259d-4e01-b1c7-8ac01e6d5149.json and https://artists.proofprofile.net/proofs/artist/6f4c78b4-259d-4e01-b1c7-8ac01e6d5149.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 0x272c925e997d60d08f0296d8f747e6ab3fd0086852836a7b322f73a469457979. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/RSA132402201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22db042e9ab8ed2eb0cb52d49b51824e90ed19bb63da4eb9680a479f4dc5e06. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAEH1963698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35891c6b9d9e37a1bb453589f5a9986b9516a65dc30dcbeaaa3af37f40fb2ad7. 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/TCAEG1909165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54066ff89da8a293cccccc30e09533db0209aad20ce2b2d5c258a76f2e0cf8a5. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/CAR071700041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5302e825142e491f96d83f18c8f6698a171b91cbf56a40bebe6aee734429e6e3. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CAR071700034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba8ea59a75979cd783660417a500a1f89b3f08636074b7ff15c33c3c5ea954d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM24S1819799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8901809edf1697ed973eac55531f857fd65f62fe219ddc36db7960962e9d9856. 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/GBKQU2409096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d47f7e6c7ba736d80495a6d4e0d050901baf06747ff144d25efaaef291c6030. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCADQ1852741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbf57d5b17135773a1e90b90b7790cf137a01a7d2446eb23661f74f7eeec4b1. 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/TCADQ1852739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76393f26c722c2306af81cc053d7ec11041fe30615f68cd2cd97be6ca7eb0a3. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCADQ1852745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28c782607ef55f4265ca760fcc26f24b2f3ee54b900f877173c410e27f62690. 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/QMWZB1711989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ad1580592274104a4c8fed395d1bd6dc7f5504cda9e358f819f9728e315a20. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/TCADF1793921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4a53642f99a14cfc69997dd24fe194f2fde294f27a9a1a1cfb9c1c1740c15a. 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/GBLFP1724164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd70a791014ccfd024911e8a864f89e6cb85da1bd7181e9661e4166120940696. 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/GBLFP1724166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb17ee13b877025f09d5a35a13bd7b0f68f264e2da9090d7f1bac18d3202da0. 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/GBLFP1724167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dceb4c31cddc46bf145c146d7ec29b1dd810bcf435d3e9ccae7021a03f8a818. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TCADA1758650.