Sing transaction with private key only

jackg

copper member

Activity: 2856

Merit: 3071

https://bit.ly/387FXHi lightning theory

Quote from: JavaScriptus on June 18, 2017, 01:42:28 PM

is possible to sing transaction with private key only?

i use 2 computers,
1- offline (without bitcoin or any other bitcoin client) (only private keys are there)
2- online computer with watch only address,

i want to make the transaction on PC-2 and go on PC-1 sing it (???how to do without bitcoin client Huh

maybe some php/JS/python script? Huh

)
and get back on PC-2 fix the transaction and broadcast it.

is this possible ?

please suggest me any script or idea.

I feel this can be done with electrum as well as bitcoin core+armory.
First, add the private keys into the electrum wallet.
Click to send a transaction with the specific amounts/fees.
Click to send the transaction.
Right click on the transaction and select details, then save.
Then this information (TXid, input scripts and output scripts) can be impored onto the online computer. (without a need for downloading the entire blockchain).

achow101

staff

Activity: 3458

Merit: 6793

Just writing some code

Anything that can sign a Bitcoin transaction is, by definition, a Bitcoin client. This is because bitcoin transactions have a certain format and algorithm for signing and require data that can only come from something that is designed for Bitcoin specifically.

It certainly is possible to have such a setup, and in fact, it is fairly easy to do. Armory is designed to make such a setup very easy to do. So you can install Armory on both machines, and on the online one, you also install Core and download the entire blockchain. On the offline machine, you install Armory and make a new wallet. Then make a watch-only version of that wallet and move it to the online machine via a USB drive. When you want to spend, you use the online machine to make the unsigned transaction (and all of the other necessary data for signing) and put that on the USB drive and take it to the offline machine to sign. Once it is signed, you take it back to the online machine to broadcast.

JavaScriptus

full member

Activity: 124

Merit: 100

suggest any good source to sing transaction offline

Topic: Sing transaction with private key only (Read 415 times)