Dum or DUM may refer to: Films Dum (2003 Hindi film), India Dum (2003 Tamil film), India Dum (2016 film), an Indian Malayalam-language film Happy (2006 film), an Indian Telugu-language film, ti
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 0x9a727dc9876c0bd1e9cc8c6ecd41083190c4df443877fbb3ab358efbb6a76077. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9f1c430-79d1-4b6b-9468-6eea32c84c86.json and https://artists.proofprofile.net/proofs/artist/a9f1c430-79d1-4b6b-9468-6eea32c84c86.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).