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 0x1862c7ea093f2ddc9169ee0c529bc742e6744c6fd5633d43df88b2a2301aa864. 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/f2f6518b-b8f9-40dc-b1ef-90a55f0afd2a.json and https://artists.proofprofile.net/proofs/artist/f2f6518b-b8f9-40dc-b1ef-90a55f0afd2a.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 0xb42f766546b87956d8a0b0eea436d3db34909045236207c5f8c2e0587f960045. 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/EEUL32205658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56b3b6547a929a4ba2098c2f95c7fb33a697e329ef1fdad978a28194f452485. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/EEUL32205657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dedb97c040c84d4c238efe4ce01e918dd83f17e6eed55003ccfcbf6fe98ad1e. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/NLRD52046313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa13aea301df2e26105cbf9641122c7729e3a496ac050bdcf311b1eeacd202e5. 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/NLRD52059302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0283d38320c53e3853ff7f14fd750723ac7c36fee507199e6a16c62fc8fb5f. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/DGA0L2350659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6193dcf8611ad06618dc9ae48339763ba9bd58e7272528ecfe7b55d2f2a4de9. 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/DGA0L2350658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae7ec8743ccfabd5bf0a3f6b47cc8a87b28247c412099f6707b35ed8d14a988. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/AUBEC2482149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f5e07bf6155bd203252580eedb82872e4008f9fc48ba40801a2616274a427f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/AUBEC2437997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c8b1541ab96b54162833483aab47e7cbea123b88887ff2b8da472ce1ceeb35. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/AUBEC2482140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6054b6177a138ee024699ac805d2038e90d489e88643140288694b2e20dd2280. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/DE1KS2504979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c177d09b7541fc6e15613e82ff240fd0a723f5c457d835dc3c75c40ae6ad962. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/DGA052573371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d00a4ae10eba16e95449e87fd89224af6a3e00b44f0a4fe6845736b82ad1b8f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DE1KS2506296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94655d5995882e04914991854ca0a0d570a91427e6fe258b87e3ab22a6f965c4. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DE1KS2506299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e1c63a2a9c819c9dd043b031fd4e864d48d4f8fdda8a8c38533f7068123787. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DE1KS2506373.