Down most often refers to: Down, the relative direction opposed to up Down (gridiron football), in North American/gridiron football, a period when one play takes place Down feather, a soft bird fe
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 0xcafd91cbdcb1cb8d01090b275a7265174d3e695d058366e13e78b1d56d373e6b. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3155bc4-7655-43d0-8365-304a4ab27dba.json and https://artists.proofprofile.net/proofs/artist/e3155bc4-7655-43d0-8365-304a4ab27dba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).