Ferens is a surname. Notable people with the surname include: Bronisław Ferens (1912–1991), Polish zoologist and ornithologist Stan Ferens (1915–1994), American baseball player Thomas Ferens (1847
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 0x895ba4b40cb6283af420ff150834ba2237716d49260993765e24d0060f9be03e. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb4410e8-b17d-43ad-bf95-d2c8bfd41ed2.json and https://artists.proofprofile.net/proofs/artist/cb4410e8-b17d-43ad-bf95-d2c8bfd41ed2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).