I read it just before I post here, if I am right. And, this too :
https://people.xiph.org/~greg/signdemo.txt The downside for your case would be that the online computer would need to sync the blockchain first, which might take some time depending how ofter you use it.
That's the problem here, I can only use it for a few hours + internet speed is terrible low - ~60 KB/s .
AFAIK electrum supports watch only wallets and should thus be able to make a raw unsigned TX, but I have never tried it.
Thanks!
I will try it and will give a feedback! I know electrum uses a dedicated server for syncing but do you know approx. time it will take(address was generated this year)?
Any alternative way? Is there any possible way to create a unsigned raw tx without syncing? I tried brainwallet.github.io/#tx but it can only be used for signing/re-signing and if needed, pushing though it downloads unspent tx(s) using Blockchain.info API. Can I create a raw tx using *non-synced Bitcoin-qt* if I know unspent tx(s) using createrawtransaction [{"txid":txid,"vout":n],...] {address:amount,...} ?
~~MZ~~