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8 votes
Accepted

Verify paper wallets

First off, only trust highly-reputable software to generate private keys, especially if they're web-based. It seems like this software has only 16 stars on GitHub and only 2 contributors: https://...
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  • 5,114
7 votes
Accepted

How Can I Ensure Private Key is Valid on my Paper Wallet?

Checking the validity of a private key is a really compute-intensive task to do by yourself, but you can do this without actually using the private key to send coins (so no need to do it using pen and ...
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6 votes

Is holding funds in a Bitcoin paper wallet safe?

Yes. A paper wallet is basically nothing more than your private key on a piece of paper. For usability it is often represented as a QR code though. You can make copies of it, and store several of ...
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6 votes
Accepted

How to claim Bitcoin Cash & Bitcoin Gold from paper wallet

Go to Blockchain.info Sign up and after logging in, go to settings. Then in settings, you will see addresses as shown below: Then click on Import Bitcoin Address as shown: Then add your private key ...
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  • 1,073
6 votes
Accepted

Handwritten paperwallet or hardwarewallet to store Bitcoins?

True. There is a standard algorithm for generating the keys from the seed words (BIP 39 / BIP 32). Most hardware wallets follow this algorithm (check before you buy). So even if the hardware device ...
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5 votes
Accepted

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

I tested it by creating a secure wallet on BitGo. They gave a multisig address for deposits. 2/3 of keys are needed to withdraw Bitcoins. BitGo holds one key, you get private key and backup key. You ...
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5 votes
Accepted

Is it possible to buy bitcoins via an exchange directly into cold storage?

You can generate a wallet for cold storage offline easily. You can then ask the exchange to use a public address of that cold storage as the recipient for a transaction. You'd still pay the fee the ...
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5 votes

What did I do wrong that caused me to lose bitcoin?

1) If you generate your paper wallet on your computer, you have to fully trust your computer 2) If you use a website for generating your paper wallet, a) you need to trust that website (hopefully its ...
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4 votes

BIP38 or Brain wallet?

BIP38 wallets are significantly more secure and are resistant to brute-force attacks when a decent passphrase is used. Generally the term "Brain Wallet" refers to one in which the private key is ...
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4 votes
Accepted

Is it true that sending from an address exposes the public key of a bitcoin address?

This is mostly not correct. First of all, the address is a hash of the public key only. Also, if one has a private key, the corresponding public key can be computed directly. So the most ...
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4 votes
Accepted

API to send bitcoins from paper/cold wallet?

You can just do it yourself instead of having to send a 3rd party your private keys. Here's one that I wrote using nodejs and bitcore-lib that takes a WIF and sends all funds to a different address. ...
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  • 5,176
4 votes

I have more than 20 paper wallets with very little bitcoin in them. How can I combine all of them together?

You should import all the private keys and not sweep them. Wallets like blockchain.info has this function where it will import the private key. In that case the private key will become part of the new ...
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  • 1,892
4 votes

Where is data stored in paper wallet?

Is there global database of all wallet addresses and transactions? Yes, it is called the blockchain. You can browse it through various websites, called block explorers: e.g. http://blockchain.info, ...
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4 votes
Accepted

I just compiled bitcoind and run for the first time. Do I already have a private key?

Bitcoin Core will automatically create a new wallet on first start. This wallet will contain 2000 private keys (unless otherwise specified by the -keypool=<n> option) and the seed used to ...
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  • 60.6k
4 votes

Recovery from theft - Tracing money to exchanges

In brief: You are not going to get your money back If you try, you will lose more money The money has by now probably passed through many exchanges and mixers in many corrupt foreign countries. And ...
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3 votes

Armory paper Backup

You can just import the backup on another computer with armory installed. It's not dependent on the computer it was created on. Remember: The coins don't actually reside on your computer - The public ...
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3 votes

Monitor paper wallet balance without importing private key?

Cointrack.net is a solution for users who need a convenient location to keep track of their various digital currencies stored in a variety of forms. Cointrack does not store your coin; instead it ...
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3 votes

How to save bitcoins as paper?

My favorite method: grab out a old/unused pc/mac install a linux over usb (maybe Talis) (make sure your USB stick is clean!) download a recent version of bitcoin-core (check hash, verify gitian ...
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3 votes

Monitor paper wallet balance without importing private key?

I use Balances.io to track my Bitcoin, Litecoin and Dogecoin balances. You never use a private key. It simply monitors the balance contained in the public addresses. I am not the owner of this ...
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  • 822
3 votes

Is this a safe method for cold storage?

It sounds like a lot of hassle to send bitcoins because you have to re-install you offline armory each time. Also, the fact you're trying to do it on a live CD tells me you likely don't have an air-...
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3 votes

What is the best method for creating a paper wallet?

Here are a list of my best practices for creating a paper wallet. Generate all keys on an offline computer system, this ensures that you are not using an online system that could be sending your keys ...
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  • 2,630
3 votes
Accepted

Is there any paper wallet printing tools which can print many QR codes?

If you use bitaddress.org, click on paper wallets, you can hide art and generate and print 7 per page on standard paper or 3 per page with art - up to the amount you need. You would then need to xfer ...
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3 votes

What would be a safe way to store large amounts of Bitcoin long term to ensure safety from loss?

NO. Using an online source to generate private keys is incredibly unsafe for a variety of reasons. The best way would be to produce the private keys offline either with a Hardware Wallet or private ...
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  • 2,378
3 votes

I have more than 20 paper wallets with very little bitcoin in them. How can I combine all of them together?

You need to Import the keys into a wallet. Send the imported bitcoin to a new address. Here is a way to do it with Bitcoin Core: Make sure the Blockchain is downloaded and fully synced (can take ...
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3 votes

Can I recover my bitcoins from an Armory paper wallet even if Armory ceases to function?

Short answer, you need Armory to open an Armory paper wallet. I use Armory and it does not fill me with confidence. I set one up and it was taking forever to sync with the blockchain. I think it ...
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3 votes

bitcoin paper wallet--multiple addresses

The bitcoin's wallet is made up of two keys, a public key and a private one. The general title of the wallet, where you can receive money from others, is exactly the opposite: it allows you to send ...
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3 votes
Accepted

bitaddress.org: is the public key the same as the Bitcoin address?

No, they're not the same thing. Paper wallets are not generated differently as/in to comparison to normal wallets. a bitcoin adress is part of a public key. The address is at its most basic just a ...
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3 votes

What did I do wrong that caused me to lose bitcoin?

The site bitcoinpaperwallet.com was sold in April 2018 https://github.com/cantonbecker/bitcoinpaperwallet And after this time many people wrote that their bitcoins were stolen: 1) https://www.reddit....
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3 votes

bitaddress.org paper wallet vs. single wallet

bitaddress.org does not use the same private keys for paper wallet generation as for the single wallet. It uses the same initial entropy that you provide, but new private keys are generated for the ...
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  • 60.6k
3 votes
Accepted

What does a Bitcoin lightning private key look like?

Elliptic curve private keys are just scalar integer values between 1 and n (The order of G). These can be encoded by any means, but usually they are just represented as 256-bit integers with whatever ...
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  • 3,190

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