Send Bitcoin with Bitcoin Core

Here's how to split transaction creation, signing, and broadcasting across different computers: You need to start bitcoind.

bitcoind -conf="C:\Users\<UserName>\AppData\Local\Bitcoin\bitcoin.conf" -datadir="D:\Bitcoin" -printtoconsole

On Computer 1 (Create unsigned transaction):

bitcoin-cli -conf="C:\Users\<UserName>\AppData\Local\Bitcoin\bitcoin.conf" createrawtransaction '[{"txid":"YOUR_TXID","vout":0}]' '{"RECIPIENT_ADDRESS":0.1}'

On Computer 2 (Sign transaction):

bitcoin-cli -conf="C:\Users\<UserName>\AppData\Local\Bitcoin\bitcoin.conf" signrawtransactionwithkey "UNSIGNED_HEX" '["PRIVATE_KEY"]'

On Computer 3 (Broadcast):

bitcoin-cli -conf="C:\Users\<UserName>\AppData\Local\Bitcoin\bitcoin.conf" sendrawtransaction "SIGNED_HEX"

Key points:

Computer 2 needs private keys
Copy hex strings between computers securely
Verify transaction details before broadcasting
Fees must be included in createrawtransaction