Questions tagged [offline]
The offline tag has no usage guidance.
0
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0answers
18 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
1answer
16 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 ...
2
votes
1answer
162 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
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1answer
65 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
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1answer
313 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
120 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 ...
0
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1answer
380 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
2answers
221 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 ...
2
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4answers
209 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?
8
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2answers
2k 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
1answer
721 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
3answers
170 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
2answers
547 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
85 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 ...
4
votes
2answers
685 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 ...
8
votes
2answers
16k 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
2answers
700 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 ...
0
votes
2answers
3k 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
3answers
204 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
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?
...
0
votes
1answer
282 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....
2
votes
1answer
681 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
1answer
4k 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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2answers
532 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 ...
2
votes
1answer
523 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
1answer
335 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 ...
6
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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 ...
5
votes
1answer
292 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
1answer
487 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
1answer
138 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
2answers
172 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 ...
11
votes
1answer
9k 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
1answer
423 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
2answers
893 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
1answer
320 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
2answers
325 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 ...
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0answers
277 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
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2answers
125 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 ...
2
votes
1answer
732 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?
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0answers
29 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
182 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 ...
7
votes
2answers
618 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
619 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
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1answer
327 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
974 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
16k 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 ...
6
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 ...
2
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4answers
759 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 ...
