Fero or Feró is a given name and family name, and may refer to: Given name Fero Fero is a nickname for Ferario and František: Ferario Spasov (born 1962), Bulgarian football coach and manager Fer
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 0xa9ddc6cc906725c2c3771b535b12f27c5279d93ca8bd5c820837a5e8d4a01a2e. Chain 2 (Bitcoin): anchored in block 953896 (2026-06-16T06:05:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/104aec2c-8bbe-4724-9466-253b098fcf7a.json and https://artists.proofprofile.net/proofs/artist/104aec2c-8bbe-4724-9466-253b098fcf7a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).