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 0xe60703d5ee606941073122587c562bfee12b8e1502a4d84f412c757a33d3535d. 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/76758bb6-569c-4981-8b28-e54c547bbeb0.json and https://artists.proofprofile.net/proofs/artist/76758bb6-569c-4981-8b28-e54c547bbeb0.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 0x9cf57dfa5c81fe60f0374eed7289ac2a3095ef738ea683eee68a2526ea8ad54e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ32275965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d764a0c4a7e1b9e1b56b4fb5fb2aaf545ecc2a96543be395e0a01a44fe3ee4. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CH7812218959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d9dc0db2ab21c88ccf873126468e5003d3bb9c412f79de6182ae66a5c590ce. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWX2276489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aedb1582cb5876640c2ecac78d7d05b69019c21a3e416c12e310a9c7fe07c90. 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/QZTB82248532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ad564456bd2e9fd62a43fa129d73a55c723ad0b6620686d8a7913b01108589. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFYZ2352457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd430d65ceb43c5374d9020d10e787c8cb8d9cc8a67ab7268878b5f92d8485b37. 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/QZHN52370429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd482d6b99d4968a0231536e95d9bb81f3491433b15e46cca6ee4d234bfdd5b. 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/QZK6P2398646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da44bc1c533ee82a4ccb0df42d55ee05134eace1e80b7befba63618066efc24. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZTB82309930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd482d6b99d4968a0231536e95d9bb81f3491433b15e46cca6ee4d234bfdd5b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6P2398646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e5e7a49ee508e64e44cb08ed36d217880df96c781d00ac51f5bc7fc0fe84aa. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES72489728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf743589937b0e2ff9e53c1c828486f5363815f3e941726d03fe08ae2cbd2c057. 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/QZHNB2430926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b48713a26d717db879457b323e39ee1b4a38aac0877bb9d900b6b5ac562b57. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZK6L2484993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9fbec103d0e9a4fa68c810aee9d703409d16ec508e5af3d61867a924417ab7. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZRP42468507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf4d96d1b137b86b2aaa639f471ce67cc0ce1c4da22b0cc186596ea5e135659. 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/QT3F32402434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c762fe27ecb51d532981136c24cfbc8b7a9df60a0ccad5cb305b4acbdaadbda. 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/QZFZ72581532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d654eea84e77dc1dfd4dd5a0a95eaee7e16db1b414761ef5980ede4be99c90. 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/QZHN32583511.