Clear DefinitionsOffline Signing
1 min read
Pronunciation
[off-line sīn-ing]
Analogy
Like writing a check at home, then taking it to the bank to be cashed.
Definition
The process of creating and signing transactions on a device not connected to the internet, then transferring the signed transaction to an online device for broadcasting.
Key Points Intro
Offline signing secures keys by:
Key Points
Air-gapped: Signing device never touches network.
PSBT support: Standardized Bitcoin offline workflow.
Transfer medium: QR codes or USB for tx data.
Risk reduction: Mitigates remote hacking.
Example
Using Electrum’s cold wallet feature: offline machine signs PSBT, exports via USB to online machine for broadcast.
Technical Deep Dive
Wallet builds unsigned transaction on online node, exports PSBT. Offline wallet loads PSBT, signs inputs, updates PSBT. Online node finalizes and broadcasts.
Security Warning
Ensure transfer medium is malware-free; infected USB can leak keys.
Caveat
Workflow complexity can lead to user errors; follow documented steps precisely.
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