Howl most often refers to: Howling, an animal vocalization in many canine species "Howl" (poem), a 1956 poem by Allen Ginsberg Howl or The Howl may also refer to: Film The Howl, a 1970 Italian f
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 0xc3defe923bef3c01e413da6668683e0386680ff7488225839c19c8bbf976402d. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/972404b3-6e09-4d24-9edc-882abb5e2df1.json and https://artists.proofprofile.net/proofs/artist/972404b3-6e09-4d24-9edc-882abb5e2df1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).