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Questions tagged [offline]

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0 votes
1 answer
207 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
0 answers
24 views

Offline wallet.dat storage for large amounts

I would like to store my bitcoin wallet offline and need a few pointers. Since this will be my long-term savings storage (decent amount, rarely accessed), I will use one PC (online) with only ubuntu ...
11 votes
1 answer
14k 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.
0 votes
1 answer
47 views

Offline transaction on exchanges

Do cryptocurrency exchanges use offline transactions?And if yes when they use it?Also is offline transactions somehow related to off chain transaction?
0 votes
1 answer
86 views

Where to find a people who have bitcoins, to exchange USD to BTC with no KYC offline?

I have cash in USD, i want to buy BTC in my city, but i don't want to buy it with exchange magazine, because bad exchange rate and because it requires KYC and i'm not want to my personal data will ...
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 ...
2 votes
1 answer
122 views

Create offline bitcoin tx for p2pkh address in a user-friendly way?

You created vanity p2pkh-addresses in the past, you have access to the private keys (WIF) and addresses (1...). Now you want to spend the funds securely and in an offline way (you do not want to ...
0 votes
1 answer
451 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 ...
1 vote
1 answer
39 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 votes
1 answer
249 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 ...
1 vote
1 answer
130 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 ...
0 votes
0 answers
86 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
228 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
476 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 ...
0 votes
3 answers
691 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
152 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 ...
7 votes
3 answers
8k 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?
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 ...
0 votes
1 answer
104 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
13k 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
2 answers
81 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, ...
2 votes
1 answer
231 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 ...
0 votes
1 answer
157 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
124 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 ...
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 ...
10 votes
4 answers
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 ...
19 votes
2 answers
15k 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 ...
1 vote
1 answer
407 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
2 answers
171 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 ...
4 votes
2 answers
422 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 ...
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? ...
2 votes
4 answers
294 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?
1 vote
3 answers
248 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 ...
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
2 votes
1 answer
761 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 ...
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 ...
8 votes
2 answers
16k 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 ...
1 vote
2 answers
617 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
114 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
955 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 ...
5 votes
2 answers
788 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
978 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
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
277 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
1 answer
7k 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),...
0 votes
1 answer
313 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....
1 vote
1 answer
702 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
467 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 ...
0 votes
1 answer
570 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