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 0x62cd3c76d894b64e4f7444cad647b18f661ab62dab51e90af4d5d5807198dcf5. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92a474d8-311b-49a7-bbe4-c8f4f5a42382.json and https://artists.proofprofile.net/proofs/artist/92a474d8-311b-49a7-bbe4-c8f4f5a42382.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 0xa14735956ad9c0cb17f34d5aa158960c1a343c92a67f99dfe6f3256f08ca45de. 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/QT3F22425723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c6f30dc2d05ee22e39fd7555d6471559dd34b11884ae4a10f2f85829ee3482. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZFYX2534397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377e24c5c1e8987693e8377d583016f92443de5374b82c3e905779d42e318176. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZFZ22558663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7d860910bca34538a0ed0c3cf13623cf77440271443fc91c9bf5b2ff03c02c. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZFZ62517437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba53b06c66101f12a941667bb9f70600aeae0e3986ec4464fccf2641793da82. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZDA42577705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3bbc2be0e811f3e46a531d9077cec18da229f6566a402156e591f90b0aabd2. 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/QZDA62514206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe570ca960e93cc6ee93ddf41ea9e1b70e7132b9f382c322f98fc8c48458558d5. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZES52595678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccfba495893b9418b3bc62adfe2488b0e4ac4cb0e2dc4d9c0ecbdc86ecd84e9. 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/QZHN42520780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfaacb2647d85878ee2cb58042f98c96a50ecdeafe218e8105962d458ab86492. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHN72552990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f8a45a6ff3d6b08edf43c777cada4825be34114b04b5bafd11540f0d4972c1. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZHNC2559951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22526690871aceefe751846cfa13ad3985964f662edb057cc396dfae671af2b. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZK6N2562390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4744039b907e8984489b6aa024676348e1dc0966a334294cfe5cc86bd1436bd5. 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/QZK6H2598053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1c6e9444dfa3711273d5ea34ce01f8c517e2a6d1e6f12c4964836c932d77f8. 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/QZMEM2592968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851d0ca9c441cc98ae2fdc0f4cfdaf6364833fc13cbba93087cce80eb7baa284. 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/QZMEQ2576323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056848b85ed3de45dfa75d9d2c9d87a1b71dde35a5c5527c068df259540892f6. 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/QZNWR2558539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27d4310b005aa52974e78e48a673394b312cf7a22e9cf5b633c51a300328ed9. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZNWY2529685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af9ed66879c4b3b0ef2d739e8905f0ba1cd9e8c74bc12f0cb712ccf1a177e5f. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZTAU2574032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1eb7a9f783984885b3230c726dfd48e7525c20dffc5a0ee014fcb6550f1ab1. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTB42546958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9815e73f0f15897e49b30997047c3a10ea00c8e6bfa530cd2ad83871f739adfd. 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/QZWFE2572321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7260a70497eb6c2ae90e28848bfa65e94909f4aca32227f45b3aa8951a795bba. 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/QT3FH2534894.