HMM or hmm may refer to: Arts and entertainment Hail Mary Mallon, an American hip-hop group Hallmark Movies & Mysteries, a U.S. cable channel Heavy metal music, a subgenre of rock music Heroes of
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 0xed815977f859a5839bf9741c8e24fbe77f2a537c4cd408a85976ec43a5dba06b. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d11c75f7-699d-4f1f-b6a0-721faab5c8e8.json and https://artists.proofprofile.net/proofs/artist/d11c75f7-699d-4f1f-b6a0-721faab5c8e8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).