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 0x9a6ea5f3c71a96fefd0e30ac866135eef27e1ba8776f05a8b00765876f8b6fad. 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/139bf973-863b-4e3a-b462-790a85154aff.json and https://artists.proofprofile.net/proofs/artist/139bf973-863b-4e3a-b462-790a85154aff.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 0x97f26df447515a3b85df5d4f686eb1b28e0af430a33a9131609bb394d71b171a. 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/QZMEP2121239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384104af45b287d7a316080359e418a53eb5641ef4e5b34060a3fb9c8c13bcd7. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZTAU2181926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb9fa143fe9c7871c78a8f16f1c0ebf1c23bd2071e26a35129979134d13c902. 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/QZTAU2181927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eddc8a5d264de62339fa3a918e5bed4ac4be5f85106232c153a827a0cb3251d. 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/QZTAU2181928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f8150a86f4eb5da8f961d06ce7891ceb32b55f7ede45ba05c4344ad6ebc16a. 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/QZK6L2235762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22144882c3991e9d62309029002d074a5543c2723a3dbcc7e9eccbfdc2a55c67. 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/QZK6H2381622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f75dd49b617b98c621c75b979ccbfe803403845fe5b355520dc0095959f22d. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZES62380149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200fec396d8534598cbc31109b527a55fd6c0fda4b832b1cba7410ab804aff61. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZK6H2381629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x913ffed812b136318660a609d7b88fd5d25a71ef09aee84d909e130e78095ba4. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZHNC2393118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993418fcdbead379dd55c116ad106a50b12230b291aa94c89caf871c890af006. 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/QZK6H2381636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c0144a3fc1c1ff7edb356ddded83f40fdebe376bfb9b68bb75b2f1ba0d50a6. 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/QZFZ72395386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985a8ead10f77b2d8c5b244665dae96d9e44935bbb4c4e28379049062892b5e3. 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/QZK6P2413587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26702c9ef2d0f808457644e081ca7e3dd51e3ee10b372201c0acbcdb67e5bb0. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZWFT2407615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9ddcc3311ea2ca29b7e06c74fd8ad2f312119243444928699375faee82505c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZFYX2551384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87857a3a611ee9ee953ac1cf04db7121a2040d290933b688e266a29ab0cbba9b. 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/QZDA62548423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b41ea86aa112d228a5b6a56f25698f66a68bb872fe1800fe1a1c1263bd633cf. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA62548425.