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 0x2c58c2bf203a3358670f945f0de525dd98dc9779fb99ed399a2d87b5889091ca. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d87e14dc-ca99-48a9-bf92-3eff64d3a0c3.json and https://artists.proofprofile.net/proofs/artist/d87e14dc-ca99-48a9-bf92-3eff64d3a0c3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
WATCHAオリジナル「ダブルトラブル」EPISODE.2 Crown - Rainism
Watcha Original <DOUBLE TROUBLE> EPISODE.2 Crown ‘Rainism’
WATCHA オリジナル「ダブルトラブル」 EPISODE.3 CONCEPTUAL Crash&Crush 'Be Mine'
Watcha Original <DOUBLE TROUBLE> EPISODE.3 Crash&Crush ‘Be Mine’
WATCHAオリジナル「ダブルトラブル」 EPISODE.4 LEGEND DUET - 安否
Watcha Original <DOUBLE TROUBLE> EPISODE.4 LEGEND DUET - 'Greetings'
WATCHAオリジナル「ダブルトラブル」 EPISODE.5 History - Back Door
Watcha Original <DOUBLE TROUBLE> EPISODE.5 History – ‘Back Door
Watcha Original <DOUBLE TROUBLE> 2nd EP Crown ‘Rainism’
Watcha Original <DOUBLE TROUBLE> 3rd EP CONCEPTUAL – Crash&Crush ‘Be Mine’
Watcha Original <DOUBLE TROUBLE> 4th EP LEGEND DUET - 'Greetings'
Watcha Original <DOUBLE TROUBLE> 5th EP History – ‘Back Door
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 0xe442814e5dc3d7eecbcd1f344437ea66a6f9007789f0f9fd90e8c045f5f668e8. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:04:28Z), 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/QZEKE2084863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508e7fb3e7daa8c08e90fb5172952f14830fed845b6883419ac4af6888ef8920. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/KRA382302356.