Questions tagged [offline]

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1 answer
30 views

What if there where no nodes to share a new block

I am fairly new to blockchain technology, so bear with me if i make mistakes So lets say there are 10 people trading a cryptocurrency 5 of them are online from 8 to 10 am and the other half on online ...
1 vote
1 answer
101 views

Pay invoice to offline lightning node

I wonder if there is a way to force a refund. Let's say A makes a payment to B. Later, B finds that he has to refund A, but A is offline. Can B reverse this payment while A is offline? Could it be a ...
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0 votes
0 answers
64 views

How safe it is to store keys in Electrum? I think Luke Dash JR didn't recommend it

I agree with Luke Dash Jr and in general this wiki with the fact that doing anything without a full node is a mistake: https://en.bitcoin.it/wiki/Clearing_Up_Misconceptions_About_Full_Nodes But my ...
0 votes
1 answer
122 views

How to use Bitcoin Core on a laptop as a hardware wallet [duplicate]

I would like to have the following setup: Bitcoin Core on an offline laptop. Here the private keys are stored. Full disk encryption. Bitcoin Core on an online laptop. Here watch-only addresses from ...
0 votes
1 answer
212 views

How to create a physical/paper backup for bitcoin-core wallet?

I am using bitcoin-core for my offline storage. In electrum I can do a paper backup by writing down the mnemonics. bitcoin-core seems to be using a different mechanism to generate the wallet. What I ...
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0 votes
3 answers
220 views

Is there a way to create a tx completely offline? Maybe with a script or cli commands?

I mean generating the transaction itself offline, assuming I know in advance how much bitcoin a UTXO has. In other words, without querying the network for the UTXO balance. Then I also need to sign ...
1 vote
1 answer
140 views

Is there some kind of USB antenna I can buy to be able to use Bitcoin even when there is no Internet?

Let's say they cut the Internet tomorrow. I will still have my private keys on my offline computer, but I won't be able to sync the blockchain (as won't anyone else) nor would i be able to make any ...
0 votes
1 answer
93 views

Offline Bitcoin Wallet [closed]

I would like to have bitcoin and store them as safely as possible. I want bitcoin data to be stored on my disk -- I don't want to some online service to manage my wallet. I also would like to have ...
1 vote
2 answers
63 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, ...
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2 votes
1 answer
197 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 ...
  • 211
0 votes
1 answer
148 views

Generating a BCH address offline

To generate offline BTC addresses, I use the bitcoin-core app from bitcoincore.org. What is the BCH equivalent of this? Is it the bitcoin-unlimited app?
0 votes
0 answers
97 views

How to most efficiently keep in sync blockchain on offline computer (including through bitcoin-qt upgrades)?

I have bitcoin-qt running on online computer. I want to: copy blockchain to offline computer (preferably using WORM media for security reasons) from time to time update offline copy with newest ...
1 vote
1 answer
1k 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 ...
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3 votes
3 answers
1k 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 ...
-1 votes
1 answer
217 views

Offline Armory does not let me sign transaction, how do I upgrade?

I have an offline laptop that will not let me sign the transaction. I am running Armory 0.92.3 and Bitcoin Core 0.9.2.1. I know that I need to upgrade to a new computer. Any thoughts how and the ...
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0 votes
1 answer
158 views

Bitcoin Core Offline Reinstallation

It is possible to reinstall Bitcoin Core Offline? I copied all the files to my external HDD. I use Ubuntu. Thanks
1 vote
1 answer
386 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? ...
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1 vote
2 answers
155 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 ...
  • 185
0 votes
1 answer
439 views

Bitcoin stolen from Electrum 2.9.3

my btc were stolen with an anonymous transaction. How was possible? Electrum should be a offline secure wallet, besides they were stolen during the night , with my desktop offline. The receiver ...
4 votes
2 answers
389 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 ...
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2 votes
4 answers
263 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?
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8 votes
2 answers
4k 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 ...
1 vote
1 answer
1k 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
3 answers
224 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
2 answers
602 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
1 answer
104 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 ...
3 votes
2 answers
903 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 ...
7 votes
2 answers
20k 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
5 votes
2 answers
777 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 ...
1 vote
2 answers
5k views

How to send/receive Bitcoins from cold wallet?

I have generated a Cold Wallet using bitaddress.org (pub + priv key) How do I send / receive Bitcoins from / to the generated addresses? Is there something I should mind about? Receiving seems to be ...
2 votes
3 answers
261 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 ...
1 vote
1 answer
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? ...
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0 votes
1 answer
303 views

Verify Offline Bitcoin Bundle on Ubuntu

I'm having difficulty GPG-verifying my offline Armory installer for Ubuntu, using the suggested steps: $ cd Downloads # the directory containing the *.deb $ gpg --recv-keys --keyserver keyserver....
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2 votes
1 answer
745 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
1 answer
6k 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),...
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1 vote
2 answers
905 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
1 answer
679 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 ...
3 votes
1 answer
439 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 ...
7 votes
3 answers
8k 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 ...
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5 votes
1 answer
302 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 ...
0 votes
1 answer
556 views

How to confirm offline a transaction

Is it possible to confirm a transaction offline in the following scenario: the "receiving" device is first online. There is no restriction at this point. Especially, it can prepare anything needed ...
0 votes
1 answer
155 views

Can I cancel an offline transaction with this approach? (opposite of nLocktime)

I would like to cancel a transaction I sent offline, and am looking for ways to prevent it from being accepted by the network. Will the Bitcoin client prohibit the entire Tx if there is even on input ...
0 votes
2 answers
224 views

Deposits to an Offline Wallet

What happens when I put a deposit into my wallet, while my computer is offline? Lets say for example, I automatically deposit btc from a pool to the wallet on my computer, but I shut my computer down ...
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11 votes
1 answer
13k 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.
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0 votes
1 answer
524 views

Selecting a computer for the OFFLINE Electrum Wallet

Would a Samsung Chromebook be a suitable choice to run the offline wallet??? I read that Chromebooks run a Unix based OS. (I would obviously disable networking, bluetooth etc.) Thanks
1 vote
2 answers
1k 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 ...
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1 vote
1 answer
485 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 ...
3 votes
2 answers
458 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 ...
1 vote
0 answers
295 views

Making a read-only Linux SD card, where are the security loopholes? (offline key generation and signing)

I have already identified a way to make an SD card truly read-only on HackaDay. So let's consider this situation: A third party have used dd to transfer the Linux image to an SD card The ...
-1 votes
2 answers
133 views

How to do Bitcoin transactions, if major Internet connections are broken? [duplicate]

If major Internet connections are broken, what happens to BitCoin transactions? For example, the Internet connection is broken between three major areas (North America, Europa, and Asia) for a couple ...