Questions tagged [offline]

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2
votes
1answer
922 views

What is a UTX 0 Proof? (as discussed in this video)

This video discusses how off chain transactions can be accomplished as an alternative to increasing the block size. At the 21:25 marker he discusses "UTX 0 Proofs". What is that?
1
vote
0answers
31 views

Preparing a "send" order offline the same way you can create an offline wallet? [duplicate]

If I have several bitcoins in an offline wallet / cold storage and want to send a few bitcoins to some address, can I somehow prepare and sign the send order offline and only copy the result (say ...
2
votes
1answer
198 views

get offline Bitcoin transaction id, chain multiple offline transactions

let's say i create a valid transaction (offline without sending it, such as like this: http://brainwallet.org/#tx. let's call this "A" a)before having sent A, can i get the transaction ID of A? b)I ...
8
votes
2answers
651 views

How to safely spend from a compressed key offline?

Armory supports offline transactions nicely, but doesn't support compressed keys. A number of other ways exist for creating offline transactions, but all of them - every single one I've seen - ...
1
vote
3answers
645 views

Make sure my offline Wallet is ok?

Let's say I make an offline wallet from a live cd with bitcoins-qt. I make some addresses (10 pcs.) I encrypt the wallet. Save it on a usb (wallet.dat). I then send over some bitcoins to one of my ...
1
vote
1answer
364 views

Paper wallet vs wallet.dat on memory stick for long term storage?

What does everyone think? Also what are the advantages and disadvantages of each one?
2
votes
2answers
2k views

Private key generation bitaddress.org vs application wallet (armory / bitcoin-qt)

Is an application like armory or bitcoin-qt more secure/ trustable in generating the public and private keys than a locally installed version of bitaddress.org ?
1
vote
1answer
1k views

How to withdraw from an offline / paper wallet into Bitcoin-Qt on Mac? [duplicate]

I understand how to create and deposit into an offline wallet, but how do I retrieve the BitCoins back onto a local Bitcoin-Qt wallet on a Mac?
9
votes
4answers
18k views

Offline Wallets: Electrum vs Armory?

I'd like to secure my bitcoin with an offline wallet. A lot of security conscious people seem to use Armory. I am trying to get a better understanding of the differences between these two clients. I ...
7
votes
2answers
14k views

How do I transfer BTC in cold storage?

I understand how to send BTC to cold storage or offline wallets, but I can't seem to find information on how to send BTC from cold storage to, let's say, a wallet on my computer, or a website, or a ...
2
votes
4answers
790 views

Offline Bitcoin payments

how secure and time efficient is offline bitcoin transactions or payments through bluetooth or NFC? The scenario of paying through your mobile (offline) and the receiver checks the transaction. And ...
3
votes
4answers
1k views

Backing up wallet with pen and paper, destroying electronic copy, restoring from keyboard -- how?

I have bitcoinQT with some coins on it. I want to use the internet on a regular basis from this computer. I do not trust the authors of internet applications and commercial operating systems. I ...
1
vote
1answer
2k views

Can Multibit be used as an offline cold storage solution similar to a setup with Bitcoin-QT?

Currently have my cold setup offline in Bitcoin-QT. Downloading the blockchain from zero is rough. It's time to update. Can I create a similar cold storage solution with Multibit? Will this speed up ...
1
vote
2answers
1k views

Electrum only offers online wallet, does it not?

I am currently using Bitcoin-Qt and have just surfed to Electrum's website. It seems that Electrum only offers an online wallet, not offline. Is that correct?
1
vote
2answers
12k views

Can the Bitcoin Miner run offline?

Is it possible to run a Bitcoin Miner offline and calculate hashes without being connected to the Internet?
4
votes
2answers
540 views

Watching and spending from a huge number of offline private keys

We plan to accept bitcoins on our eshop website. What we want plan on doing is: 1) Keep all private keys always offline (cold storage). 2) Generate at least 100,000 keypairs of which only one will ...
10
votes
4answers
2k views

Do any of the Android-based wallets support cold storage?

Specifically I'm looking for Armory-like functionality where the transaction can be generated on an online system, transported to an offline android tablet or netbook via USB or QR code where it can ...
3
votes
2answers
244 views

What is a cost-efficient, fast and easy method of transferring btc between own computers?

I use a few computers and would like to perform bitcoin transactions from any of them. Thing is, I'm not very fond of the idea of paying the fee and waiting every time I want to transfer the coins ...
5
votes
1answer
429 views

Keeping a portable long-term offline wallet

I'd like to keep some bitcoins as a long-term investment - store them to a pen drive which I stash in some safe place, or otherwise backup it securely, then remove all traces from my online computer ...
2
votes
1answer
173 views

Can a transfer be done over postal mail?

Suppose I'm stuck in the middle of nowhere with no internet access and I want to make a payment to a certain Bitcoin address. Is it possible to do a transfer via postal mail, and if so what ...
19
votes
2answers
14k views

How to sign a transaction using only an offline computer?

I think it is possible to generate keys on an offline computer and sign. To create a transaction I need to input transactions detail, and somehow I have to transfer signed transaction from offline ...
7
votes
3answers
7k views

Sending bitcoins programatically without running a node [duplicate]

How can I send bitcoins in my web app without running the daemon on my server? Is there a way to do it? Do third parties allow you to send through them?

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