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 0xdbebe41488030558b476981a9fa05b30328ee2287bade4cc70b1de10fd23063b. 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/d72dd9f2-498d-4b06-a344-cb11833f1e4f.json and https://artists.proofprofile.net/proofs/artist/d72dd9f2-498d-4b06-a344-cb11833f1e4f.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 0xafc6597b890fb439b4407882805e908043b0fb3f8651a2cb71725c4521d55f3e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/AR9S51600201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf214f3c6e806707621b1d82070abe7f89d7ba3f048e3aaf8d66addfba6070bb. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/AR9S51600203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a98efdb6b73812ec9dcc9f416377935cb7e419f0de2f16fe5e775a4c373f168. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/AR9S51600204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958f458713777e6c631f6d1c4873f73e391e7e7692fa51a25f20650aef3fec8d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/AR9S51600205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ad0299d1c3fd1d7503d79992df59835bb189027a956de3b15f05c2abfdeece. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/AR9S51600206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78660557a30c2d99cf79be42b67cc3515b52248577e0f46f7f0944267367fd6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/AR9S51600208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6d8bfe7feac58b8812914f78b10a72a55fe5d6182331f7bcb06ced8c6fecf9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/AR9S51600212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0ad291a01dbb0cc9acaf9fb5a801ec2d87473a45421686fbc413d518d1b9b3. 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/GBSMU4052392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbe1f491fd900bf7e4d0c01fa1b9b1ee6b705f9da564a2a50cfd69f69a0e34a. 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/GBSMU4052393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee1358be087e81f4a3e42f0a314c4614dd909c3fee7e16c7f2eebd75154a036. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/GBSMU4052396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f104b00a842b78bbc4758bf60a2d9ec8fede6bb7506b50747af31bcc95a7b10. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/GBSMU4052397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd32b8b7345e15d767c212a005e65e4c3c66025a49ca6ddb5f6484330b6a4c04. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMFME2307482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6a93617dcbcdd6c5f8c48a4d2aad015e7762ad3022a58990b398919e9360c5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMFME2307483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6da4834d12cccc1e8117a79b5e30099d1f979ed3458964c60a5b98c951e4c37. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMFME2307484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef12f949c0e02c5ec8bf754d826ea5c1a3eefef511eaa62b6db1ab017109c2ec. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMFME2307485.