Questions tagged [offline]

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20
votes
2answers
11k 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 ...
11
votes
1answer
10k views

How to download bitaddress.org to use offline?

The site does not have a download option. I can save the page using Google Crome by CTR-S, but the version I have saved in this way does not work.
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 ...
9
votes
4answers
17k 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 ...
8
votes
2answers
17k views

Why does Bitcoin Core take up so much space?

I have downloaded Bitcoin Core and the blockchain has nearly filled my local storage. Can i move the wallet to a hard drive and then delete Core from my computer? I'm a newbie lol
8
votes
2answers
626 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 - ...
8
votes
2answers
3k views

Settling offline transactions

Use Case My use case is around a scenario where both customer and merchant possess offline wallets with a balance that has had confirmation on the blockchain. To begin with, let us say that, the ...
7
votes
2answers
7k 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 ...
6
votes
3answers
4k views

Can I spend/transfer bitcoins directly from cold storage?

From reading previous articles I understand that you can receive bitcoins to an address even if your wallet is in cold storage because the bitcoins sent to this address is recorded by someone on the ...
6
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?
5
votes
1answer
295 views

Is it possible to have complete cold storage in NXT?

BTC has capability to create new account on offline computer and send some coins to and from that account without ever going online. Sending coins to that account is trivial. Sending from that ...
5
votes
2answers
722 views

What is the best method for creating a paper wallet?

I am looking to move some of my bitcoins from cold storage to a paper wallet. I have heard that metal stamping is one of the better long term strategies since paper can burn or fade. Any other ...
5
votes
1answer
417 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 ...
4
votes
2answers
239 views

Security implications of regular saving into cold storage

I am thinking about following this plan: Regularly buy bitcoins in an online exchange, 100€/month at market prices. Once the balance in the exchange exceeds a certain limit (500€), move those ...
4
votes
2answers
527 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 ...
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 ...
3
votes
1answer
357 views

Extracting information from utxo for offline processing

I would like to extract as much information about the utxo set (all unspent transactions) up to a given block height, including value and scriptpubkey. This information is meant to be inserted into ...
3
votes
2answers
728 views

Safely transferring bitcoins from wallet.dat to cold storage

A similar question was asked by me in 2014, but I did not find the answer satisfactory back then, and I hope some things changed since in the last two or so years. I have a wallet.dat file with some ...
3
votes
2answers
328 views

Holding all your money in one address = Paper wallet?

A paper wallet is a very misnamed term, since it's in fact a "paper address" indeed (contrary to a "wallet" which stores multiples addresses, for ewample inside the wallet.dat file). Lots of people ...
3
votes
2answers
238 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 ...
2
votes
4answers
226 views

What if I receive bitcoins when my device is powered off?

What happens if I receive bitcoins when my computer or smartphone is not online or powered off?
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 ?
2
votes
2answers
361 views

Signing a bitcoin transaction OFFLINE fails

I know this subject has been discussed quite a lot, but after several days looking for this to work, I give up. I want to create a transaction on a view-only wallet which is connected to the internet ...
2
votes
1answer
701 views

Do you need to be connected to the internet to send someone bitcoin?

Say I walk into a store that accepts bitcoin. I decide to buy something and go to the counter. I get my smartphone out to pay the bitcoin. Does my smartphone need to have an internet connection to ...
2
votes
4answers
765 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 ...
2
votes
1answer
168 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 ...
2
votes
1answer
57 views

how to get bitcoin off an exchange?

As a corollary to asking how to transfer from cold storage, how is bitcoin first put into a paper, or other wallet, when it originates on an exchange? My primary concern is more getting the coins out ...
2
votes
1answer
5k views

How can I install a bitcoin wallet on Kali Linux?

I got Kali Linux installed on my laptop and I want to install a good bitcoin wallet to store my bitcoins offline.As I know,top 5 best bitcoin wallets would be Bitcoin Core (the first offline wallet),...
2
votes
1answer
835 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?
2
votes
1answer
185 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 ...
2
votes
3answers
210 views

Cold storage companies?

I was curious to know if anyone knows of any bitcoin business that stores people's wallets offline? I'm looking to diversify my backup methods for cold storage and am wanting to send my backups to a ...
2
votes
1answer
535 views

How to securly move bitcoins from a wallet.dat file to a paper wallet? [duplicate]

I have an old wallet.dat file with a few Bitcoins. It is stored in an isolated computer that is not connected to the internet. I would like to get rid of the wallet.dat file, and move all the ...
1
vote
2answers
570 views

is it necessary to stay connected to internet [duplicate]

it could be a basic question for you guys, but i'm new in this. is it necessary to stay connected to internet while doing solo-mining ? is there any method to keep mining without permanent internet ...
1
vote
2answers
8k 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?
1
vote
2answers
556 views

Does a long time storage wallet need to be online?

I have a offline computer that has never been connected to a network. I use this computer for long time storage of sensitive data, all data transfer to and from this computer is done by USB memory. I ...
1
vote
1answer
3k views

Bitcoin-Qt wallet shows outgoing transaction as “Offline (0 confirmations)”

What is the meaning of a transaction status of "Offline (0 confirmations)" as opposed to "Unconfirmed (0 confirmations)" ? Does it mean that the transaction has not even been sent to the network yet? ...
1
vote
1answer
343 views

Is bitaddress.org compromised?

When I tried accessing https://www.bitaddress.org with Firefox, I was redirected to https://www.bitaddress.org/bitaddress.org-v2.7.2-SHA1-364542f1ccc5777c79aebb1692a6265cf3e42e7e.html and got a ...
1
vote
3answers
186 views

Does a thin client testnet wallet exist which allows offline signing?

I appreciate I can do offline singing with bitcoin-core, but it's complex. To make it easier, I would have to download the entire blockchain. I have searched up electrum, but can't seem to find a ...
1
vote
1answer
330 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?
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
42 views

Taking out bitcoin from offline wallet

Ok, let's say I have an offline wallet for storing my bitcoin, now I have got a good amount of bitcoin, but i don't want to take out everything from the wallet, I only want to take out a small amount, ...
1
vote
1answer
112 views

What really happen when user moves fund between Main Account and Trading Account in HitBTC?

I am building a crypto exchange and I wonder how HitBTC exchange (https://hitbtc.com/) is handling "Main account" and "Trading account", as the image below: According to them, Main Account is like ...
1
vote
1answer
338 views

Generating paper wallet offline with liteaddress GitHub download

After extracting all the files from the .zip file available at GitHub, which of the files do I need to open from the download in order to generate keys offline. Is it the bitaddress.org html file? ...
1
vote
2answers
129 views

Eliminating all private keys records from pc

Suppose I buy a new wifi router and a new pc. I set up both the wifi network (of course, with a password) and the pc. Now I access the internet for a few seconds in order to download bitaddress.org ...
1
vote
1answer
856 views

How to BIP38 existing private keys offline

How do I go about encrypting some existing private keys using BIP38 in an offline manner? I have looked at bitaddress.org and that site only lets you BIP38 keys which the bitaddress.org site itself ...
1
vote
1answer
89 views

Noob questions about transfering and offline security

I created a wallet on a USB and one with coinbase. I bought a bunch of bitcoin on coinbase and transferred .01 bitcoin to my USB wallet to make sure I transferred it right before I transfer ...
1
vote
2answers
911 views

Electrum Offline Storage - two different OS, multiple wallets

Regarding the instructions to create watch-only wallets in Electrum, I am clear on the intial setup and functionality, signing transactions, etc. but I have a few questions about going forward: Is it ...
1
vote
3answers
622 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
985 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?
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 ...