Cosmo may refer to: Business and media Cosmopolitan (magazine), a magazine for women, sometimes referred to as "Cosmo" Cosmo (book), 2012 short story collection Cosmo On-Line, a Brazilian generi
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 0xf193bfc3d97f137c70518c45cadf502239a3d1a98a73b6ece2050dfb0a761960. Chain 2 (Bitcoin): anchored in block 953879 (2026-06-16T02:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0a9dfa0d-cec9-4743-b02e-fe5dc3fdcf9a.json and https://artists.proofprofile.net/proofs/artist/0a9dfa0d-cec9-4743-b02e-fe5dc3fdcf9a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).