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 0xe380e2a7c1863b7f36a9b111edcc288c33a891708c566cbd527e04b5996fbc09. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e27e905-9a8d-4975-a474-6ce09b4b5488.json and https://artists.proofprofile.net/proofs/artist/9e27e905-9a8d-4975-a474-6ce09b4b5488.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 0x752e87d32eb58ae172f26407675539ea565958cc76d92ea11a7e37dd80c54ac5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAY2377620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6d1ceb556c0a213cf2c865c82cd917f728836d3e6cbdf79e0d8ba40a74e3e3. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZTB92409657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65427068d76012414afcca1c2254ff1f769238d8bf6a28f2b8701f5fc8dbb328. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZTBB2476897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8084385bc14b3f8b01d266973b90e55b9f4c15a80dd8977dca390aad508733. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZWFE2467572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ba2243a1c651fb26d8f725e79f80989470566f903e1daacb1aa979f634aca5. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZDA82580178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c98a3792a7ca00266f5e7177e7dd5979addf77368fcdc76a597273fed739a1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZPLR2514621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a1f045bcdf2d95653a3727d6ed19e55e8d8764df81076212cbda6d6bc148eb. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZPLR2514622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa048f163fc0d3e0b4fbc38e9c215341e23cbdc92075ba38f4958d6ea18a9ae88. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZZ7P2576134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97be8959fb5571202b59c64c178c3fb8f7f118d705702cdb247d25803b4d6ffa. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZZ7P2576135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab1fe04c6ecec47a146ef7551f1978b4d09528e1e22ab879283b726a145ca8b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7P2576136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162e3f8b3c875647b1bbf3fabb9e13e1767ea4404932d9cee591f7d3b3cd5da2. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZZ7P2576137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a012fb8ccd88adcc04c282866749c21be0f06c25299978d6bd6aed729f3b1a1. 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/QZZ7P2576138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb117f3b349a1250520f5434b6bd27f6e6284135688b619cf75eb4e441fd1b62. 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/QT3F52532887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7cc39b7fb393df326e43ad6d86b8e92d13e59bc13d09d84d69bc2a60aca894. 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/QT3F52532888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c51acd6d113dcecae4105c50934f6d88f59594f6b7b2f13933b87c99ad0b18. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QT3F52532889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32b8960700238372662fbc53715009f088d5ddc135ff726404c84c5ca0e5bda. 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/QT3F52532890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2331ba21b1ed91194722903d667d1d50b0edba93197c9525ce7da94ba6cd5cd. 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/QT3F52532891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049cfad188f836805d2fc9723245f46f595eaa65ff513c08edb6ff9b81906ad3. 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/QT3FH2587463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e625af8d202ad2c856fc0c04c50837573a1c954b4415c62c78bd345230c9cb5. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QT3FH2587464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6bca1b5e9e4775d424cefe76a3e858e349e96baf779db5c70cca93a0cedc21. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QT3FH2587465.