Polarr is a startup headquartered in San Jose, California, that offers applications to allow creators to make and distribute photos and video filters. Its products include mobile apps for creators to
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 0x354f06c581f9e23caac8d607af2a701bb577e4d7930a809a2ee7f0c62380230a. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1412d4a-a2e6-49cd-99c6-301fc6401fc7.json and https://artists.proofprofile.net/proofs/artist/c1412d4a-a2e6-49cd-99c6-301fc6401fc7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).