Rossy is a Canadian regional chain of variety stores located primarily in the provinces of Quebec, Newfoundland, New Brunswick and Nova Scotia, Canada. The company was founded by Michael Rossy in 194
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 0x6e8db6c5bcc15e9e7f12b5b968f702317786014cfd876a88457ded0f2c460fbc. Chain 2 (Bitcoin): anchored in block 954063 (2026-06-17T07:49:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48329cee-0ec1-4563-bb37-ab1906957c98.json and https://artists.proofprofile.net/proofs/artist/48329cee-0ec1-4563-bb37-ab1906957c98.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).