14 votes

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

"Improbable" is an understatement. There are 2256 possible keys. In the entire universe, there are estimated to be "only" 2100 atoms. So the odds of someone else ending up with the exact same ...
abelenky's user avatar
  • 1,344
14 votes

What kinds of wallets are there?

What kinds of wallets are there? There are many ways of classifying wallets Index Wallet types Hot vs Cold Desktop vs Mobile Non-custodial vs Custodial Paper vs Hardware vs Brain Full-node vs ...
RedGrittyBrick's user avatar
11 votes

What kinds of wallets are there?

Hot and cold in this case refer to if the private key is stored on a system connected to the internet or not. Hot wallets are stored on system connected directly to the internet. This can be on the ...
Klassare's user avatar
  • 316
9 votes
Accepted

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

If you are comfortable with a command line, I have used ssss-split and ssss-combine for sharding encryption keys in a n-of-m scheme. These utilities use Shamir's Secret Sharing Scheme to safely break ...
Jestin's user avatar
  • 8,812
7 votes
Accepted

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

The easiest way to do this by importing the address you generated on the offline Bitcoin Core client into an online fully synced Bitcoin-Core. The command is: bitcoin-cli importaddress <address>....
Ugam Kamat's user avatar
  • 7,408
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 ...
Erik Goff's user avatar
5 votes
Accepted

How to securely store Bitcoin server-side?

The precautions you can take from an architerual point of view would be as follows: The database storing the private keys or the seeds in case of HD wallets should be running on a separate instance ...
Shabahat M. Ayubi's user avatar
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. ...
m1xolyd1an's user avatar
  • 5,646
4 votes
Accepted

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

While theoretically possible, the algorithms involved mean that it is practically impossible. You would need to compute the seed from your mnemonic word according to BIP 39, and then derive the keys ...
Adam Millerchip's user avatar
4 votes

Security implications of regular saving into cold storage

Q1: Depens on how you use it. Transactions to an address does not decrease it's security. Using a cold-storage wallet and taking it online exposes your wallet and it's security. Q2: It's correct. ...
2313112441312's user avatar
4 votes
Accepted

Need a cold wallet. Segwit, Lightning, Fees?

Fees are not based on the value that is being transferred but rather the size of the transaction in bytes. The fee is to pay the cost of storing the data that makes up the transaction itself, not for ...
Ava Chow's user avatar
  • 70.4k
4 votes

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

The generation of private keys is made randomly. Therefore, it is possible for someone to generate the same private key as you did. In your question, you heavily insisted that you did not want an ...
Cedric Martens's user avatar
4 votes
Accepted

Best OS for cold storage

Use TAILS Linux. From the website: Tails is a live operating system that you can start on almost any computer from a USB stick or a DVD. It aims at preserving your privacy and anonymity, and ...
MCCCS's user avatar
  • 10.2k
4 votes

Signing a bitcoin transaction OFFLINE fails

signrawtransactionwithwallet uses the wallet for two purposes: Finding the private keys necessary to sign with (which you dealt with by importing) Finding the transaction outputs that are being spent ...
Pieter Wuille's user avatar
4 votes
Accepted

How does a hardware wallet interact with the bitcoin network?

No. The hardware wallet company sometimes runs a node, but you could just as easily use a client like Electrum instead, and use Electrum nodes instead with your hardware wallet. All the node is used ...
ieatpizza's user avatar
  • 2,068
4 votes
Accepted

How does a completely offline wallet "registers" and runs

There is no wallet registration in the Bitcoin blockchain. The Bitcoin blockchain is a public ledger that records transactions and nothing more. Wallets are completely isolated components from that. ...
dassd's user avatar
  • 1,069
3 votes
Accepted

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

Personal, I would use multiple wallets just in case some exploit is found in the future. For the more paranoid/safety conscious person, I would also place the hardware wallet in a mini faraday cage, ...
Astad's user avatar
  • 212
3 votes

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

The idea of ignoring sufficiently small possibilities is fundamental to BitCoin, and if you have a problem with it, then you shouldn't be using BitCoin (or anything else that involves a finite ...
Acccumulation's user avatar
3 votes
Accepted

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

If LBC is somehow able to guess anyone's private key, regardless of how the private key is normally stored and generated, then yes, they can just spend the coins. All you need is the private key, it ...
Ava Chow's user avatar
  • 70.4k
3 votes
Accepted

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

Do they store the private key of users in cold wallet? In short, yes. (Some) private keys are stored in cold wallets. The record of all bitcoins (UTXOs) exist as a public database, which is stored ...
chytrik's user avatar
  • 18.3k
3 votes
Accepted

How does Sentinel check Blockchain?

“Sentinel” is just an interface to an API owned by Samourai Wallet. It therefor leaks the fact that you own the outputs you’re watching are probably offline storage (and links them together into one ...
Claris's user avatar
  • 15.4k
3 votes
Accepted

Are all 'metal wallets' functionally equivalent?

Just to be clear/nitpick, the products you've linked to are designed to act as highly resilient physical backups for a bitcoin wallet. It doesn't really make much sense to refer to these metal plates/...
chytrik's user avatar
  • 18.3k
3 votes
Accepted

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

Building the unsigned transaction requires the input data(transaction IDs, vout, values), and is also good practice to check the network fee climate prior to setting a fee in the transaction you are ...
m1xolyd1an's user avatar
  • 5,646
3 votes
Accepted

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

You can verify the legitimacy of Coinkite's Coldcard key generation, assuming that you've used Coldcard's feature of generating the entropy for the seed words by throwing dice (the key generated will ...
BronzeAge's user avatar
  • 349
3 votes

How to Properly Use a Hardware Wallet and Recover My Coins if I Forget it Somwhere?

To receive payment, shall I just give my address to anyone and ask them to transfer? Yes, but for privacy reasons, it is recommended to give people a new address for each payment, and avoid re-using ...
ieatpizza's user avatar
  • 2,068
3 votes
Accepted

Create a .psbt using the BitcoinCore client

The "Create Unsigned" button is only available to wallets with private keys disabled (i.e. watch only wallets). So you will need to create a new wallet and choose the "Disable private ...
Ava Chow's user avatar
  • 70.4k
3 votes
Accepted

What needs to be on a USB such that you could hand it to someone and gift them a discrete amount

The device that Nic gives is called an opendime. It's not a normal USB stick. The device generates a private key and a public key. At first only the public key is accessible, at this point you can ...
StijnBTC's user avatar
3 votes
Accepted

why is BIP 39 unanimously discouraged for implementation and what should I do about that

BIP 2 provides for comments that can be posted on BIPs on the Bitcoin.it wiki. Currently, all comments about BIP 39 are negative, which is what is summarized as "unanimously discouraged for ...
Pieter Wuille's user avatar
2 votes

BIP38 or Brain wallet?

BIP38 allows you to hide your private key in plain sight. Nobody knows what the private key is until they decrypt it with the password. A brainwallet is essentially generating a private key by ...
John C.'s user avatar
  • 79

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