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Questions tagged [wallet-security]

Questions about keeping wallets and e-wallets safe.

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1answer
15 views

Is it safe to store user's secure pass-code in database with encrypted form while creating bitcoin wallet?

I would like to create a Bitcoin Wallet. Part of the process is to store public and private keys in encrypted form in server database. All keys I am storing is encrypted using user's passcode. 1) ...
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2answers
51 views

What can you do with the private key?

I am trying to understand all security regarding blockchain and bitcoins. Let's say you have a bitcoin wallet which is secured, only you know the private key. This bitcoin address was created on one ...
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2answers
71 views

How can a third party spend BCH accidentally sent to a BTC address?

I transferred BCH to an Electrum wallet address and haven't ever received it because Electrum uses only BTC. As I have been trying to recover it, I looked up the transaction on explorer.bitcoin.com ...
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1answer
24 views

What type of Bitcoin wallet is more secure than others?

What type of Bitcoin wallet is more secure than others among Paper wallet, Physical bitcoin, Mobile wallet and Web wallet ?
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1answer
12 views

Physical bitcoin vs. Paper wallet?

What is the main difference between a Physical bitcoin and Paper wallet ? And which one is more secure ? And why ?
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4answers
52 views

Exchanges and security

How can I ensure that my crypto-assets are secure when trading in a certain exchange? Even when I have my private wallet, I should deposit into theirs before trading.
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1answer
27 views

Virus warning in Bitcoin [cash] ABC client?

I tried to download Bitcoin cash ABC wallet from bitcoincash official site. If I download zip to my computer and upload it to VirusTotal site, it says 11/62 positives. If I go to VirusTotal site and ...
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1answer
38 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 ...
2
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2answers
129 views

Is It Possible to Prove Ownership of Public Key Hash without Public Key?

I am building a system where I would like the user to specify a public key hash of a wallet that they have control over in the event of tips, refunds, and/or otherwise needing to send value back to ...
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3answers
131 views

How can I safely store and trade Bitcoin and other crypto currencies?

How can I safely store Bitcoin? Exchanges require me to deposit to trade, is this safe? If I can't trust exchanges, what is the best way to safely store my cryptocurrency and transact it?
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1answer
44 views

Possibility of hardware wallets being 'unsupported' in the future?

I was reading online about getting a hardware wallet/vs a paper wallet, and some comments online were mentioning that "Tech changes so quickly that in 16 years the hardware wallet might be completely ...
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2answers
472 views

How does crypto exchange secure private keys?

I'm wondering on what is the current common apporach that is used by centralized crypto exchange to secure the private keys of the bitcoin wallets
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2answers
222 views

BIP32 recommends a 256 bit seed. Why do most Bitcoin wallets only use a 128 bit seed?

According to BIP32's "Master key generation" section, "256 bits is advised". See https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#Master_key_generation Why did BIP32 consider 256 bits ...
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1answer
509 views

Bought a used ledger nano s from Amazon / Ebay. How do you factory reset the Ledger Nano S?

I just bought a used ledger nano s from amazon and ebay. What is the best method of wiping this device and factory reset it? What are some other precautions before using this used device?
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2answers
217 views

Private key security level

Any of a kind Bitcoin wallet need to share private key on the internet-connected machine. Bitcoin client has no responsibility for to keep private key secure. If your's machine connected to the ...
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2answers
303 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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1answer
95 views

Digibyte Wallet Hash

I recently invested in digibyte. As someone of IT-security field, I'd love to know how the passphrase is stored in digibytes wallet.dat. The Bitcoin2John doesn't work on it and hashcat, too, has no ...
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1answer
533 views

How will Lightning Network nodes secure their hot wallets?

The success of the Lightning Network is dependent on payment routing. Successful payment routing will require online nodes with automated signing facilities. This entails online nodes with hot wallets....
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3answers
178 views

How would you store a very large amount of crypto currency

I have Litecoin, Bitcoin, Ethereum and NEM. In recent times, I've become a very lucky boy indeed! I usually download and install the "official" wallets that download the entire blockchain but this is ...
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1answer
898 views

Mining Bitcoin Wallet's Private Keys Instead of Blocks

Instead of mining Bitcoins directly, couldn't one of these huge processing farms dedicate their processing power to instead discovering the private keys of the largest wallets on the ledger? I ...
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1answer
1k views

guessing random private key [duplicate]

From what I understand (which is not much), private key is like id/password for your wallet. So lets say, I have random number generator and I generate random number, is it possible that generated ...
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1answer
495 views

Using a dedicated phone as “hardware wallet”

Is there anything inherently insecure about using a dedicated Android phone as a "hardware wallet"? A dedicated phone implies: a clean ROM without gapps, i.e. Lineage OS without root full phone ...
2
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1answer
601 views

Are received BTCs really mine?

when somebody send me BTCs I recognize that by seeing a transaction output is equal to my address. But how can I be sure that it's really me and only me who can spend the output? I can check, I can ...
2
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1answer
621 views

My blockchain.info wallet was hacked. How can I create a double send to foil the attacker?

This is the transaction. https://blockchain.info/address/1F8EP97jgQx8QD6XMRg2bCHHrJrZEMUTRt Which is still unconfirmed. I am trying to use https://coinb.in to create a double spend transaction with ...
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1answer
119 views

Can I store the whole blockchain yet keep my actual wallet with bitcoins offline?

I want to have the full blockchain "just in case" yet have my wallet be OFF the internet. Like, on a laptop that's just for bitcoin, with wireless turned off. Or possibly on an external drive that ...
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2answers
936 views

Can I use the same seed words for two wallets?

I like the security of a local wallet, but at the same time I don't like the limited access. So I'm thinking I'll install the same wallet software on a second computer at my office and use the same ...
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2answers
281 views

How much space does a backup of a wallet usually take?

I have a Bitcoin QT v0.8.5-beta wallet (downloaded in 2013) which I will backup before trying to export the private keys to a Electrum wallet. I have found a backup button in the QT wallet, but it ...
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1answer
528 views

Security risk(s) in running bitcoin core full node

What are the security risks posed by running a full node bitcoin core client? On a typical system, port 8333 is open and all other nodes can actually 'see' my machine and sites like https://bitnodes....
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1answer
120 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 ...
1
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1answer
51 views

What prevents real-life robberies in the hypothetical future where Bitcoin is widely used?

What prevents the following real-life robberies from happening in the future where Bitcoin or similar cryptocurrency is widely used? Robber A goes to an infrequently-visited street vendor and buys a ...
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1answer
169 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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4answers
474 views

Encrypting wallet manually instead of using hardware wallet

i am new to this community and like to know why one should prefer a hardware wallet instead of using encryption algorithm like AES-256 along with PKDF2 to secure crypto wallets ? i currently hold btc ...
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1answer
126 views

What can I do if I suspect that my Mycelium word list backup has been compromised?

When creating a backup with the Mycelium app, it gives me a list of 12 words which are used as some form of seed which I am supposed to write down and store in a safe place. Anyone with access to this ...
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3answers
347 views

How safe is it to use online wallets? [closed]

I want to know if it is safe to use online wallets? Can we trust online storages which stores our privkeys, passphase and wallet.dat files? I read that at least one android wallet was hacked so I ...
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3answers
756 views

How can extended public keys generate child public keys without generating the child private key in HD wallets?

According to the documentation on bitcoin.org and the Mastering Bitcoin book, you can use an extended public key to create child public keys in HD wallets by combining the lefthand side of the hash ...
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1answer
295 views

Keeping my bitcoins safe: any flaws in my strategy?

I'm looking for a very safe way to keep my bitcoins. I'm using a Trezor and used passphrase to hide additional wallets in case someone gets access to my Trezor or seed by physical coercion. I'm not ...
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1answer
45 views

Isn't it safer to only encrypt the wallet, then back it up, and NOT save the seed?

If you use the seed, and it gets compromised, then you immediately lost all your coins. But if you only save the password safely, and backup the wallet file in several locations, then you gain a form ...
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1answer
45 views

Security bridge on bitcoin-qt walletpassphrase

Is it safe to use walletpassphrase with bitcoin-qt rpc call ? I can think of a security problem, suppose hacker was able to insert some kind of program that call each second to the wallet with ...
3
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4answers
313 views

Store Bitcoins offline

I have some bitcoins and ether at Blockchain.info and I am really scared of losing them. How do I best secure them? Right now I have a paper with the code to restore my wallet, but my coins are still ...
0
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1answer
131 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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2answers
75 views

How to reduce the amount of transactions with handling wallets?

i'm working on a Web Application that will allow users to deposit Bitcoin into their own wallet, leading to a service that invests their funds in X(lets say alt-coins).i'm having issues on how to ...
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1answer
112 views

Blockchain.info wallet terms

Is the wallet ID you use in your blockchain.info wallet the same as your public address where others can send bitcoins? And the 'Backup Phrase' is the same as your private key? Maybe if someone could ...
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2answers
1k views

Are my retrieved BCCs stolen from my Electron Cash wallet?

I installed the Electron Cash Wallet on my laptop (version 2.9.2 downloaded from official site "electroncash.org" with the correct checksum). Then I retrieved my BCCs (from an imported BTC adress in ...
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1answer
816 views

Can you deposit to an unplugged Trezor?

I just want to confirm if my logic is correct. If I send Bitcoin to my Trezor address while the Trezor is unplugged does the web wallet then receive the private keys from the transaction and only once ...
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1answer
633 views
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1answer
328 views

Security for Lightning Network nodes?

Imagine a Lightning Network node A that maintains a bidirectional payment channel with one peer B. For this channel to be maximally useful, some of its value must belong to A. To update channel state, ...
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1answer
308 views

Cryptocurrency Wallet Seed - mental backup?

Ok, so let's say I use a wallet that gave me a 12 word string as a seed. And I want to do a paper and "mental" backup - will write it down and will memorize the words. Where is the itch? Well, the ...
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1answer
148 views

What does blockchain.info wallet need your email for?

This question is related to the specific software product, but comments on the need for usage of an e-mail address in similar software products are welcomed. I installed blockchain.info wallet to my ...
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0answers
102 views

Blockchain nodes and webwallet

I am rather new to the blockchain technology and wallets. I was thinking about creating a web wallet for storing my coin. I have a basic understanding to how blockchain tech works, I know it takes ...
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1answer
366 views

How is Electrum able to find my default wallet even though I deleted it?

OK I didn't delete it. I closed Electrum, renamed the wallet to xxx.default_wallet.xxx and moved it to my Desktop from C:\Users\Chloe\AppData\Roaming\Electrum\wallets. I wanted to test wallet restore. ...