Can bitcoin transaction be signed offline without access to blockchain

2

To make an offline transaction signing we do the following:

[Online PC]: Create unsigned transaction [Offline PC]: Select and sign the transaction [Online PC]: Broadcast to network

Is it possible to do the following:

[offline PC]: Create transaction [Offline PC]: Select and sign the transaction [Online PC]: Broadcast to network

Seshu Bonam

Posted 2013-12-04T20:42:09.477

Reputation: 81

Answers

3

If you know the unspent outputs you have the keys for, yes.

Which in practice means that you need to have seen the transactions that have paid you. Once you know that, the actual transaction to spend it can be created offline.

Pieter Wuille

Posted 2013-12-04T20:42:09.477

Reputation: 54 032

thanks, can the transaction history be updated on offline device after every signed transaction? – Seshu Bonam – 2013-12-04T21:38:30.447

okay, incoming transactions cannot be added. – Seshu Bonam – 2013-12-04T21:41:34.570

1

see http://bitcoin.stackexchange.com/questions/17966/how-to-safely-spend-from-a-compressed-key-offline/17975#17975

– John – 2013-12-05T01:54:54.750

Asked: 2013-12-04T20:42:09.477

Viewed: 1 185 times

Active: 2013-12-04T21:14:52.117