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 0xda7d87bad69fcdd5fa97d9a5b4540394baaac5fef90d58b403b7213a36ed4ced. 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/426c2619-663d-43a5-85a4-b3e013888c1f.json and https://artists.proofprofile.net/proofs/artist/426c2619-663d-43a5-85a4-b3e013888c1f.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 0x0d4c3b136703502a380a106f74f9f4437ed61d5d57e02b75efb7f741ddc11ec4. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZDA52305195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb294c1616e4fbee1f490495f7f8ad2fa7a4834577aa4eacb8be5ba388c85fe6. 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/QZMEN2338305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca503573b0b393d123ab9ffa67d6b747ed06c3bed3f4213ae6c69c5ffb06bd77. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZDA42438765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf828b6f9ea7cb440fb95365ebf236650d7c90a81336b03094e5d78b2cd727820. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHN72467369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f5f45d75ef4111446236c70973684c749364a2ceda357ca30b0aef9ab58f38. 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/QZHN72467370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5684bcdaa97c4ff8a14ac475f7353ed67f75f0fb5df106773566c7843228f634. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTAY2462677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ea869646b4206324a38a79351b2e7cff71560da8a4fae836c5d06a1e0a9b3a. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZTB82481141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5684bcdaa97c4ff8a14ac475f7353ed67f75f0fb5df106773566c7843228f634. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZTAY2462677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf828b6f9ea7cb440fb95365ebf236650d7c90a81336b03094e5d78b2cd727820. 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/QZHN72467369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca503573b0b393d123ab9ffa67d6b747ed06c3bed3f4213ae6c69c5ffb06bd77. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZDA42438765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ea869646b4206324a38a79351b2e7cff71560da8a4fae836c5d06a1e0a9b3a. 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/QZTB82481141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b816b800df38a6afd44f7f854896ef7e1b0d66feff522f315bf6f4a36f9568. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZZ7Q2449432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc24a89e49dded63726f3be55b051f960c340ab8e9f45cccd5ceb95b47756ac. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZZ7X2501266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2fcada5a3e0a0ab772d8126dbfbe01431e35f7e3b2b7ef6c7c31d105efbcfe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/AU8N02100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9364cdc3d42e8850b82c65281dcfd45e61d8bb4d21a852b936a54c99a6fc75cd. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEAR42127298.