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 0x4f6ce97d5341bec8f939fee1f606af20ab148c252f6181bc49763711f5c92196. 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/832c90e7-f7f7-4c24-a2e4-cfd53da818fa.json and https://artists.proofprofile.net/proofs/artist/832c90e7-f7f7-4c24-a2e4-cfd53da818fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xd9fec4ad7702011599adb4223bc4bd568584e7d3a6e8c0d3f7705112ab443aec. 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/QZ4JJ1931287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1707449b0e8d275227dae77ed73111505b3b47eddde56cd8acf3fc073b64cd5d. 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/QZ4JJ1931289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc451ee8cf67f5e30383c1cb99e342e205360a61b405d2c1c1e4ff084680204a2. 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/QZ4JJ1931291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9645ee4caca8fa0f55b8c343ebc8bc438f45337838ff1752b3f0780672de698a. 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/QZ4JJ1931296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae06565ba6880b9143c26c357bc0b75767d05c51d67062670710f2a59f1897e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZ4JJ1931297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431fda5570a5bc1a535677ee887d119b6d09413903e72f267337616ddb86c9db. 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/QZ4JJ1931299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21adbf2c4359b6f209ddb21462e5142a9ec2e2e660e6d7c3909b10b9a821730d. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZ4JJ1931304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0a72209933eba1ea8bc57f0e54d80e69e7c07fa45ca0477d478cea4349936f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZDA62118445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471066494e6f9dc35920e48d14e9e8e6f1be34f3599557a6e00bf0ed1bfd3390. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZDA62118447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07e2bd100740633b716df34e9c9e8252db7414965f2e0413ab5c9ee7c362e8b. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZDA62118448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac76944ff92627272c41b5898c70274922e7d306977537eddf3fe785f8a2a841. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZDA62118453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b629bafc1f46581921be217c116d28ab0cceda6d7873833a397de733d2a321. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZDA62118455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518fa473148edc071afa3053aa950759518313fceed21a3ad947070b3da9e06c. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZDA62118461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1ae41b204ef8c947ad4a14572c23ef8eb017ca816b2b1d1ef17f72cf33d4e9. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZDA62118465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b5632ea87268d6d2ca46760322a9e7108d8560d729bfb688efbf16074df0c9. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZFZ32317618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e9db20327a85c7c4ab45d08f7292f3839c1e84b9eec9ccf64593f66088db60. 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/QZZ7M2467538.