Questions tagged [coldstorage]

Storing a wallet offline, i.e. making the private keys inaccessible from the web. This is e.g. implemented through use of Paper and Hardware Wallets.

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15
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3answers
4k views

Estate planning: how can I ensure my bitcoins are inheritable?

What are good ways to ensure my bitcoins can be inherited by my family when I die or become permanently incapacitated? I think there are probably two significantly different situations to account for,...
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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 ...
8
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3answers
2k views

How can an online wallet be more secure than paper wallets or cold storages?

Recently, after I was reading that some bitcoin early adopter lost 750 BTC due to theft from his macbook, I was looking for the most secure storage solution for my coins. I already know about paper ...
8
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4answers
4k views

Secure way to store BTC over a long time - and its risks?

What are the most secure way to store a huge amount of BTC over a long time and its (detailed) risks? A other assumption is that the owner does not have a very technical background, thus it will not ...
8
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2answers
558 views

How can an online system detect coins sent to its offline (cold) wallet?

Say, for security reasons, that a bitcoin business has an online wallet (aka hot wallet) with enough coins for day-to-day operations. The rest of the funds are in an offline wallet (aka cold wallet or ...
7
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3answers
6k 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 ...
7
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5answers
3k views

BIP38 or Brain wallet?

I have seen many videos about paper wallets and different ways to store BTC. And I have choose to store using a cold wallet (paper wallet). But I am not sure what option I should choose: a normal ...
7
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2answers
13k 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
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3answers
1k views

What is the safest physical to store a private key only to be accessed after death?

Assume that my friend would like to encrypt his Bitcoin private key(s) and safely store them in a secret location. This located would only be identified to heirs after death in his will. Should he put ...
6
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2answers
2k views

Is it possible to send coins WITHOUT importing private key?

I have a cold storage wallet that I periodically move funds into. I want to be able to send funds out of the wallet quickly. Right now, I have to keep a clean VM up with the full blockchain, then ...
6
votes
1answer
150 views

Is it safer to use one type of hardware wallet of several?

I know that there are several brands of hardware wallets with open source firmware that are considered safe. Is it better to just one that is safe and you are most familiar with? Or would hedging by ...
5
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1answer
300 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
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1answer
506 views

Is this a safe method for cold storage?

Here is the method I plan to use for creating a cold storage. I am very new to all this, and have never used Bitcoin before. I am not very technical either. Anyway, here it is: Create a live-cd with ...
5
votes
1answer
590 views

Can I use Multibit private key for paper wallet?

I plan to export the private keys from Multibit, keep those and delete everything else. Now I read about Multibit having some kind of hidden mechanism for spare adresses within a wallet. Would my ...
5
votes
2answers
752 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
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1answer
351 views

How to implement cold storage payments using bitcoind

I wonder what APIs of bitcoind I can use to sign a transaction without actually publishing it. I read that createrawtransaction (in conjunction with signrawtransaction) is a bit risky and for sure ...
5
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6answers
1k views

Safely convert paper wallet to encrypted online wallet

I started investing a not insignificant part of my salary into BTC a few years ago. I created 10 paper wallets (using bitcoinpaperwallet.com) on a dedicated laptop disconnected from the Internet. I ...
4
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2answers
919 views

How to send bitcoin from an offline Bitcoin Core that doesn't have a synced balance?

I am setting up a cold wallet. How can I generate a signed raw transaction from bitcoin core wallet that controls some bitcoins? PS: I generated the wallet using getnewaddress in console from the ...
4
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2answers
321 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
1answer
1k views

Transfer coins from Armory paper backup without Armory

I have an armory offline installation on a USB stick with Ubuntu. From this wallet I have a paper backup. To access my funds I tried to install Armory on Mac OS and Windows 7 with no luck. The best ...
4
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2answers
537 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 ...
4
votes
1answer
74 views

How do exchanges automate transfer of Bitcoin from a cold storage wallet?

Most exchanges use Cold Storage to store the bulk (approx. 95%) of their user assets. Only a relatively small amount (approx. 5%) of funds are held in their Hot Wallet. My question is, what process is ...
4
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1answer
591 views

How to backup paper wallet digitally

I'd like to move some bitcoin off an exchange and into a paper wallet for long term storage, but looking for ways to backup the keys in case of theft/fire/stupidity. My thought was to (on a new ...
4
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2answers
591 views

Using Armory Watch-Only wallet in Electrum?

Is it possible to import a Watch-Only wallet that was made in Armory into Electrum? I like to use Armory for cold storage but like Electrum more for hot wallets because it's lightweight and you never ...
4
votes
1answer
455 views

How would one go about generating a BIP-38 encrypted vanity address for cold storage?

I want to generate a vanity address with BIP-38 encryption for a cold storage paper wallet, how would I go about securely making one? From what I've found, generating a vanity address with Vanitygen ...
4
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1answer
327 views

Sending from CryoBit Cold Storage

I just purchased a pair of CryoBit cards and it occurred to me that, while I know how to send money to a cold storage wallet, I am not exactly sure how to send money out. I assume I import the ...
4
votes
1answer
300 views

Bitcoin Cold Storage Question

I am ready to put some of my BTC holdings into a couple different cold storage wallets. I went through the process already moving around a few mBits as tests, created the keys on an offline PC, sent ...
3
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4answers
2k views

Is holding funds in a Bitcoin paper wallet safe?

If you received lots of bitcoins, like 100, and you are not comfortable holding them in your personal blockchain wallet, is it preferable to move them and hold them in a paper wallet for safety ...
3
votes
2answers
1k views

Can I send btc to a totally offline wallet?

I want to setup a totally offline armory wallet. is it possible to send btc to a totally offline pc? Is it also safe, I guess it must be synchronized with the whole network, right? And there is ...
3
votes
1answer
702 views

API to send bitcoins from paper/cold wallet?

I am making a program which will take a .wif private key, and send all funds from the wallet represented by the key to a certain address. I need this to be fully automated, but I can't seem to find ...
3
votes
1answer
442 views

There is at least one totally “offline” backup of blockchain?

I know that it can be a little paranoid yet, but anyone ever did an offline backup of blockchain in case of a kind of geomagnetic storm? Imagine if all clients of the world lost the data. I know the ...
3
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3answers
191 views

Securely encrypting a cold storage wallet

I'm going to buy bitcoin to exchange BRL to CAD currency, as it's gonna be a great amount I'm concerned about the security of my wallet. I don't want to use a physical backup like paper or device ...
3
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3answers
6k views

Can I use Electrum seed as a paper wallet?

Based on what I've read so far I'm pretty sure that what I want to do should work, but I'd like to get some confirmation to make sure I won't be causing myself issues by screwing something up if I'm ...
3
votes
1answer
217 views

What is the risk of using wallet.dat files for long term cold storage?

i created these wallet.dat files on an offline machine in 2014 using QT. I've sent coins to the receiving addies over the years. these files are bip38 encrypted. do i need to do anything to these ...
3
votes
2answers
850 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
1answer
280 views

Cold storage for bitcoins

I'm planning to store some bitcoins in cold storage. I'm doing a very simple setup, no complicated algorithms, no wallets... Here is my plan Create an air-gapped machine with a Linux distro. The ...
3
votes
1answer
672 views

What is the equivalent of cold storage or paper wallet for NXT?

I want to be able to secure my NXT in cold storage. What are some ways of doing this? Since NXT is only accessible via a brain wallet, I can just store the passphrase on a paper, but what if I ...
3
votes
1answer
275 views

Best practices for service/merchant handling bitcoins [duplicate]

Possible Duplicate: Best way to safely host a high volume online transactional wallet? There have been numerous incidents where bitcoin services have been hacked and large amounts of bitcoins ...
2
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3answers
1k views

What kinds of wallets are there?

Can I get short a explanation about cryptocurrency cold/hot wallets? Are there more kinds?
2
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3answers
1k views

Why does using a wallet in cold storage make it less secure?

According to How to set up a secure offline savings wallet, Every time you retrieve bitcoins from your savings wallet, create a fresh savings wallet by repeating the above procedure, and send all ...
2
votes
3answers
841 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
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2answers
2k views

How can I generate a Bitcoin address from a 12 word seed without using a computer?

I have a 12 word seed and I want to generate an address without exposing it to any computers. How can I accomplish this?
2
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2answers
936 views

What do I need to consider, when I chose media to store a cold/offline wallet?

I'd like to stash away at least part of my Bitcoins in an offline wallet which I will put in a bank deposit box. Which media is recommended to use for that? Should I burn a CD/DVD or put it on an USB ...
2
votes
2answers
490 views

What is the most efficient and safest way to handle cold&warm Bitcoin storages?

Think of a situation where you receive and send bitcoins on a regular basis, like an exchange or a payments processor. You want to keep as large a portion of your coins as possible on the cold ...
2
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2answers
88 views

Why does all cold/offline storage setup require three steps?

I was reading about cold/offline storage and from what I have seen all clients seem to work the same. Requiring you to create the transaction on the online computer, getting it to the offline computer ...
2
votes
2answers
639 views

Why is it safer to keep your bitcoins offline than online on Coinbase?

I'm trying to think of a good way to store my bitcoins somewhere but I can't really think of a way to do it without 1) having something physical (eg. USB key) that can get lost or destroyed 2) having ...
2
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1answer
241 views

Not totally cold but how cold and safe is it?

If I put my btc in a wallet in a pc but never connect it to net unless i need to use btc, is it practically cold storage and how safe is it?
2
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3answers
124 views

Is it possible that malicious bitcoin wallet providers provide pre-generated private-keys for users?

We trust wallets like Ledger, Trezor, and etc. We believe the math that the randomly generated private keys are safe. But could it be possible that the private keys you thought are “generated” are ...
2
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1answer
376 views

How do Bitcoin Altcoin Hardware wallets work?

From my understanding the hardware wallet contains your private key inside the device. When using a hardware wallet, the gui wallet on the computer or phone creates the transactions, but does not ...
2
votes
2answers
283 views

new Bitcoin Core (0.13.2) as Cold Storage Wallet?

What are the instructions (in GUI or CLI) to setup and use the new Bitcoin Core (0.13.2) as Cold Storage Wallet? OS is Ubuntu 16.04.