Dah or DAH may refer to: Morse code symbol Dah, Ivory Coast, a village in Montagnes District Dah, Ladakh, a village in Jammu and Kashmir, India Dah, Mali, a town in Ségou Region Dah (band), forme
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 0x536915f69b585b46d3d1caba203df9d4c560661aea6dbe75ceab8a6d95ce7d28. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aeed4831-a9db-4712-b39a-c24ba22e3517.json and https://artists.proofprofile.net/proofs/artist/aeed4831-a9db-4712-b39a-c24ba22e3517.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).