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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015c29fc7d80e04dd8f96bbdc74b88938c6d55831a023aa5d867120a8ff527fe. Chain 2 (Bitcoin): anchored in block 953736 (2026-06-15T03:21:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99fa7c04-1a2a-4a55-8fae-c34f9db46f0f.json and https://artists.proofprofile.net/proofs/artist/99fa7c04-1a2a-4a55-8fae-c34f9db46f0f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f48cc9df8b3c7728bbfcee3742fc28d2fe96afe9cfbd20ad26d4d6b9f933b3. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHN82453519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0349f629a8a896d944146462efbd2806260da3cf547f1154dbb853c4d0f95e. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T11:02:36Z), 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/QZWFQ2477320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534682fff87e6c156c613bbfc5c7a07f5a5184665377b1713a02ac4a3d4f070e. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:16:04Z), 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/QZHN52599591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534682fff87e6c156c613bbfc5c7a07f5a5184665377b1713a02ac4a3d4f070e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:30:23Z), 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/QZHN52599591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1c668747144f24e61a8d0070e031b6eb582a17c86becb906b5a19186f415a1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-17T04:33:22Z), 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/QZMEP2551919.