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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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16 views

Cold storage/signing

Anyone have a link to a good cold storage setup for signing larger transactions? Example: old pc with monitor (camera?) in basement to take a transaction and sign it and produce a qr code to be ...
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1answer
14 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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1answer
118 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 ...
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3answers
28 views

What they stored in cold wallet? All bitcoins anyone owned is already in blockchain

I just want to understand what actually they store in the cold wallet because all bitcoins anyone owned is already in the blockchain. Do they store the private key of users in cold wallet?
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1answer
41 views

Best OS for cold storage

I want an OS which can be easily disconnected from all hard drives (just uses USB) and can be booted from usb stick, also secure enough and disconnected from internet by default (or something I can ...
0
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1answer
220 views

Can the Large Bitcoin Collider project 'break' into offline hardware wallets like the Nano Ledger S?

Let's say the Large Bitcoin Collider manages to guess the private key of a particular Nano Ledger S. Can they then 'spend' or 'steal' the Bitcoins on the Nano or 'send' them to another wallet?
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1answer
268 views

Generating additional change addresses manually in Electrum

So I have an offline wallet created with Electrum. When signing transactions on the cold storage machine, I would like to be able to check that the address I'm sending the change to is actually a ...
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2answers
84 views

Transactions for multiple crypto-currency coins in cold storage without downloading full block-chains

I've searched on the internet and still unable to understand the usage of cold storage. Actually, I want to buy a few types of low price crypto currency coins and save them in my personal devices or ...
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2answers
371 views

How do exchanges use cold bitcoin wallet while still able to automate transfers?

Some exchanges mentions they use a cold wallet to keep the private key. As far as I understand cold wallet is a wallet either in an offline machine or kept in hardware. However, it appears that ...
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6answers
1k views

How do I protect my paper wallet from use by a different human who has used a random generator?

Since millions of people use Bitcoin and Bitcoin Wallets that use their own addresses use several addresses per day, it is obvious that generators can generate the same characters for the Bitcoin ...
3
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2answers
341 views

Need a cold wallet. Segwit, Lightning, Fees?

I have all my coins on exchanges. I'd like to keep some in cold storage. I know I can create one at walletgenerator.net. But I'm scared because I think there might be a better way or it may not be ...
2
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1answer
890 views

does 24-word recovery seed recover just bitcoins or all coins?

I keep Bitcoins, Bitcoin Cash, Bitcoin Gold, Ethereum (via My Ethereum Wallet) and Litecoins on a Trezor. Question 1: In the event that my Trezor is lost or destroyed, will my 24 word recovery ...
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0answers
32 views

What exactly is cold storage? [duplicate]

I've been reading some answers and what I gather is that its simply an off-grid storage of your private user key. Off-grid meaning its completely disconnected from any network meaning it can only be ...
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0answers
55 views

Cold storage, transferable to hardware wallet

As far as I understand, hardware wallets generate a deterministic key space using standard algorithms: starting with a (random) passphrase (and more security tokens?), they are able to rebuild the ...
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1answer
421 views

Trezor; How is it true cold storage if their is a recovery seed?

I don't understand how a Trezor is considered cold storage if you can lose it, and then recover your keys through their recovery seed and another Trezor. Where are the keys coming from? Where are ...
4
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2answers
219 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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2answers
1k views

Is there a cold storage option for altcoins?

Is it possible to create a paper wallet for altcoins offline and send your altcoins there? I can only buy altcoins from online exchanges like bitrexx but I feel it's really risky to keep large ...
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1answer
138 views

Why is a full sweep of a cold wallet more secure than a withdrawal?

I've seen on This question that you should not make partial withdrawal from a cold storage address; because it could compromise the security of the cold wallet. Can someone explain the related ...
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1answer
784 views

Is https://www.bitaddress.org/ safe to create a paperwallet?

I want to create a paper wallet for cold storage and am not sure of the best way to do that. I heard of https://www.bitaddress.org/, but is it safe if booted from an offline PC? Thank you!
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1answer
199 views

How to generate a paper wallet?

What do you find the best way to generate a paper wallet for BTC? I've heard of this one: https://keybase.io/warp/warp_1.0.9_SHA256_a2067491ab582bde779f4505055807c2479354633a2216b22cf1e92d1a6e4a87....
2
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2answers
977 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
481 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 ...
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2answers
489 views

Multi coin paper wallet generator?

Is there a site where I can generate paper wallets for multiple cryptocurrency addresses?
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1answer
224 views

How to create Etherium brain address?

I have used bitaddress.org to create a brain wallet for my Bitcoin. Now I would like to create a brain wallet for my Etherium. Is there any reputable tool (preferably similar to bitaddress.org) I can ...
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2answers
308 views

Recommended way of printing a cold wallet

I'm considering making cold paper wallets (for multiple cryptocurrencies) for offline storage in a safe deposit box. Before accessing the safe deposit box, my identity is checked and I must show my ...
3
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1answer
350 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 ...
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2answers
171 views

Which wallets support spending partial amounts of btc from a cold storage address?

Which wallets let you spend partial amounts from your btc address from a cold storage address without the need to import / sweeping it? I know mycellium has the feature, but I'd like to know if there ...
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1answer
538 views

Method of spending LTC Litecoin from a paper cold wallet?

I know mycellium has a feature for BTC where you can spend partial amounts from a Bitcoin cold paper wallet. Is there something like this for a LTC Litecoin cold paper wallet? I just want to spend a ...
0
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1answer
138 views

Forks/ alternative coins and paper wallets

So I have some bitcoin on paper wallets purchased at ATMs well prior to the bitcoin cash split. I have only kept cold-storage paper thus far, but recently purchased a Ledger Nano S. My question is, ...
0
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1answer
135 views

Use trezor securely

I'm trying to figure out how to use a Trezor for my needs. I'd like to have different "layers" of security, so my plan is to use this setup (less secure on top): Online wallet for every day usage (1%)...
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3answers
787 views

How to setup USB Cold Storage for Bitcoin and Monero?

Is it possible to keep many currencies (Bitcoin, Monero...) on one USB drive? If not, how can I setup USB Cold Storage for Bitcoin and Monero?
2
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1answer
3k views

Is there a paper wallet for all crypto-currencies?

I am relatively new to crypto-currencies and I am just wondering if there is inherently a paper wallet for all crypto-currencies made? Do they all have public and private keys that you can write down ...
0
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0answers
198 views

Cold Storage for Alt Currencies

Let me start by saying I am not a technical person. In addition to Bitcoin and Ethereum, I have LTC, XMR, XRP, DASH, POT, TKN, NXS and LSK. I'm looking for a way to put them in cold storage. I've ...
2
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0answers
132 views

How to safely use cold storage

I am relatively new to cryptocurrencies and would like your feedback on how to safely generate paper wallets for BTC, ETH, LTC and XMR tokens. I intended to follow these steps: Download and install ...
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2answers
425 views

How to securely store Bitcoin server-side?

I am working on a web application that needs to hold users Bitcoin for an extended amount of time (escrow-like scenario), and I was wondering what are some good steps/precautions and principles (dos &...
4
votes
1answer
491 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 ...
0
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1answer
53 views

'Deposit account' for repetitive bitcoin payments

I am looking for something that would allow me to offer a general "deposit" address (like for payments through my website, services I offer etc.). I am using Electrum as cold storage solution (with a ...
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2answers
109 views

Electrum Holding Bitcoin Long Term Seed

I am sure this has been asked before but I want to be absolutely sure before I start: Using the Electrum Software I have created a basic default wallet on my desktop. I have a good deal of money ...
3
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3answers
156 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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1answer
470 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 ...
0
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1answer
301 views

Receive at Watching Only Wallet

I am a little foggy about the Watching Wallet copy in Armory. I have received BTC in my Watching only wallet. Is there anything that I need to do now to get those to the Cold Storage Wallet or is the ...
2
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2answers
261 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.
2
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1answer
2k views

How to install Electrum wallet in an offline Linux computer?

So I want to play with the Electrum wallet, but as Cold Storage. Then what I plan to do is to install a raw Ubuntu 16.04 LTS into a computer "A" which I will never plug to the internet. So, with ...
3
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3answers
5k 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 ...
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0answers
80 views

Does Trezor have any shortfalls security-wise?

Or do you have a recommendation for another cold wallet?
2
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2answers
354 views

Why wipe all BTC from an imported address?

I've read a couple blog entries and tutorials on how to spend BTC that are "stored" on a piece of paper. They all suggested importing the private key into e.g. blockchain.info's wallet (or any ...
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
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1answer
169 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 ...
4
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2answers
672 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 ...
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 ...