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 0xc893ad7f3ddaa6d38bad080bee3a9a9d91b7b8f0cf4532dba9c71ff9630b6401. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6255461c-5758-4f3e-aa28-1296f75b054f.json and https://artists.proofprofile.net/proofs/artist/6255461c-5758-4f3e-aa28-1296f75b054f.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 0xe0ceef6d83df221f41effe9e665eb63edf8e093a523ed15f180e2476c6f0bc04. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NL8RL2405559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79a58f03c2c22a1175b6146977396010a21465122d2c42a52a0bf7c9fd296f2. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/NL8RL2501843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1761f598a4dd927bb1ddc886d0c8af545ba053bbd7a83c69de322735142e7e3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:19:03Z), 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/NL8RL2501846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0994247aa0f643cb3824332d4b674e5e791e02cfa1f182563d1926bc953bc5. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/NL8RL2501849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8418aa90c4d640a6ac7c7c202639b423a498de4573dba45e04f70388088d7cde. 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/NL8RL2524253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8a0f93378d6af1131b41099d3b936e705234d0485f891b8445193391b0f5df. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:30:26Z), 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/NL8RL2524254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2156a2fc324572d19ff565b31b15a9df6b219a092c0a46ec67b48312cc24f1. 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/NL8RL2524255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc0a471b034803f88562478ea361238cf14839b9fb958111f750f6a6336e643. 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/NL8RL2524256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9e86840518df2ec351b2b5d92ad74dd298e5dbe6292b1b807c130b3bcc7fd6. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/NL8RL2524257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6758c4c54ce5dbf0d79e8387a55905376d301e48fe516cf71fa2e6fb999bae. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/NL8RL2524258.