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1answer
37 views

Premining documentation?

I'm looking for more information on how to actually premine a coin. I would be grateful if someone can show me an example. What I've tried so far does and not work, I'm basically mining the first ...
1
vote
1answer
30 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
1answer
38 views

Can i limit the back-up data in wallet.dat?

I want to know is it possible to back-up manually from wallet.dat, consider i am running Dogecoin daemon locally scenario: say user(user1) have some dogecoin balance in addr1 and another user(user2) ...
2
votes
2answers
147 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 ...
3
votes
1answer
84 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
50 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
29 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
69 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 ...
3
votes
1answer
656 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
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1answer
74 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
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2answers
185 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 ...
1
vote
1answer
174 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
126 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
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0answers
108 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
2answers
92 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 ...
0
votes
0answers
51 views

how does generation of bitcoin wallets work?

so i just realized that when we generate a wallet address on our computer. does the blockchain know that it exists if there was never anything sent to it? If the blockchain doesnt know it exists, ...
2
votes
1answer
148 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
19 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
107 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 ...
4
votes
2answers
339 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
489 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
249 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
1k 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 ?
0
votes
1answer
531 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?
2
votes
4answers
6k 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 ...
5
votes
2answers
2k 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
4answers
371 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
620 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
678 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?
4
votes
2answers
394 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 ...
6
votes
1answer
323 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
208 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
333 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
144 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 ...
6
votes
2answers
1k 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 ...
3
votes
3answers
3k 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?