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 0x3b1575f2e4af08042524b8d224e57631de02553469b6e85ad93e65ad3f68f654. 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/f4248f4b-f6af-4ddc-91e3-208624a013d5.json and https://artists.proofprofile.net/proofs/artist/f4248f4b-f6af-4ddc-91e3-208624a013d5.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 0xeef7f6aeaf1a6f1374ed10b3b724c8e3354bee570f2b6d697db163d8d10d4818. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USCGH2186599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a7f5e24e614e8aed7df79e8d8760cb4639a1c8131cf656b51d65e91c7b6e4f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USCGH2186600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8450501c0a44a2dacfef370e2833a18a520d4a85355cc74f70529e4e0c4b18. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZAAH1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91975e2f79026728b3a7b45f47f33470187765d034cf7624b30993d0034241fc. 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/QZAAH1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9668664219d35c0d1281877903097599c0113b4e2a0661127f80ef4e543edf3e. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZAAH1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ac08e633389fb92a0d82996422d74f48684d2118dc460eaa921b2544e62c1a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZAAH1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0948150a4a08a70ff18a697b62538583504ebdfd233e99c8cfe73edc8e4604c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZAAH1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1058a27ab78c7092ced37676faa80cfb48b3ee96b1065aa1bc3ed67dac89d3c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZAAH1700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ee7dbd0f587d324b00899a6c2133000cac754d98fc972eda4a7f71fec9d31a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USHM22004832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2d1d69a6da1b04a6e5e749f440a6f37e6b9ac688477d146dac2339a5460f61. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USL4R2003210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b597860811273605a874222b36cd111d461632b56525c5bb8e61a5e24a137e. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/USHM92155435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf917ee7367b9d7e028951a67ed1bc55ca374799b18998fffdd10e0cdc1fc8f25. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USHM92155436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13166619d90b1949cdca049b81934e0fc39c2543d8fa03df955e0c4ea66ed50. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USHM92155439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d8af094ff406a39cb59e4499d1cfd9901e27f4a631006db9ad01589459a9be. 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/TCAEL1960095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f70e178c6174ae209ad472b51c2336c609a6feab9fc01bb5827e5d8baa5041. 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/QZ5FN2359399.