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 0x1dec090a0d1c5d8fbaec2446035559b7d9f779948e5ee04710f684732812cd43. 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/e0f31c0d-2129-4f7f-944b-cd134ca6937f.json and https://artists.proofprofile.net/proofs/artist/e0f31c0d-2129-4f7f-944b-cd134ca6937f.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 0x4b1b434e0f1c76a4289cb83849a8ab14b3c43860dcf7d85cfc4abfe3ae25cfce. 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/QZDA82574269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbe20d5cc841801077aa38f223a493a31d02b2947d651233fe151085331b2c3. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZDA82574274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40729c677f65613d38c6ff68289cf91eb6ba4e403f0c83177b7b6da7c448f289. 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/QZDA82574275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096dd74d5ea4d8e5b9f387da1c40de60e09b62286302d298c5bcdbacd8f9d357. 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/QZDA82574276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7beafbf1e6516d138ff6b7a71ef99f8a64322c69bf3f4f5a7390ba1b540cd9. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZDA82574278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43c0f0d8f92b8301d9f6129d5dc2f4cd3f2bd6eb1bfcd776263004e687fdb4f. 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/QZDA82574280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50559253444534f80f172fc22464cfb8c52abecccf9debced322560b3c9a1a6d. 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/QZDA82574283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b67960497c162156ba0b82f0338b0dc11fb2e132fd601d19ab9edb7b948931. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QZDA82574284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe50b49a05dcc049b58bebbad447c70e5de88b2eb9f6475d179028d3a9e450cd. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZDA82574285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be5274db2ea8f3b5788c93be20b429e9709c5fffcf22b6d71e2f1c539b5b21f. 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/QZDA82574286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d85e84cd38422e5adb416ace30963acb5d278bde9d1b43e33dc3cf27dd191d8. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZDA82574288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2626a4f3aa8c1b536dd6105c1a835d9a1c8e9f5f8f804d07ca7ed261a05c5e6. 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/QZES52587879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cf4be9dbac7ae822b13f9667af844057d65624c1991a850507ff940e07c98c. 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/QZES52581939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c8e607d7c1e9d6147109c5de44583a280cec72a71cd113fe0f338f4717a5b5. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZES62514380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131d41994dc00ac28604ae0ac8bedad5a2cb267d677bca6c70293f993aa9725e. 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/QZES62514381.