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7 votes

Why does Bitcoin Core take up so much space?

You can reduce disk-space usage of Bitcoin-Core by enabling pruning. Enabling pruning means you delete old, already verified blocks without reducing your security. Once old blocks are validated and ...
Jonas Schnelli's user avatar
7 votes

Why does Bitcoin Core take up so much space?

It's not Bitcoin Core that's taking up all the space, but the Bitcoin blockchain that Core needs to download, validate, and reference. This is because Bitcoin Core is what's called a full node. ...
Jestin's user avatar
  • 8,812
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

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
3 votes
Accepted

What if I receive bitcoins when my device is powered off?

Solution This works fine. The bitcoins will appear next time I start my wallet application. (Read tuxcanfly answer) Bitcoins are not actually received by the software (wallet) on my computer, they ...
Suriyaa's user avatar
  • 153
2 votes
Accepted

Does a long time storage wallet need to be online?

You don't need the 3rd step for long-term storage. You don't plan to spend your bitcoins any time soon when you're looking for long-term storage. If you download the blockchain now, it will long be ...
UTF-8's user avatar
  • 3,224
2 votes

What if I receive bitcoins when my device is powered off?

The network contains those transactions (either in nodes' mempool or block) and you will receive your Bitcoins when you are back online.
tuxcanfly's user avatar
  • 395
2 votes

Security implications of regular saving into cold storage

No it will not decrease the security of this wallet. Security concerns happen when you have to use your private key (i.e when you spend money). Reusing an address will indeed allow other people to ...
Julien Klepatch's user avatar
2 votes
Accepted

Pay invoice to offline lightning node

It seems you are mixing two concepts in your question. 1.) the necessity of having an invoice 2.) the necessity of being online Re1: invoices are not necessary with the not standardized keysend ...
Rene Pickhardt's user avatar
2 votes

Bitcoin stolen from Electrum 2.9.3

Easy. Someone has/had remote access to your wallet/files. They don't need access to the computer during the time of a transaction. Example: Send me your wallet and go ahead and secure your computer ...
Michail Wilson's user avatar
1 vote
Accepted

What if there where no nodes to share a new block

Yes networks that are cut off from one another, cannot intercommunicate and therefore cannot transact with one another.
RedGrittyBrick's user avatar
1 vote
Accepted

How to create a physical/paper backup for bitcoin-core wallet?

if I generated 100 addresses and transferred some BTC to all of them, I need to backup all the 100 addresses. Bitcoin core is an HD wallet. So you should only need to backup the extended master ...
RedGrittyBrick's user avatar
1 vote

Is there a way to create a tx completely offline? Maybe with a script or cli commands?

In this approach, Bitcoin Core is used to create the transaction offline without the hassle of manually creating the transaction: How to move/sweep your Bitcoin Core bitcoins safely and air-gapped to ...
hodddl's user avatar
  • 101
1 vote

Is there some kind of USB antenna I can buy to be able to use Bitcoin even when there is no Internet?

Blockstream have multiple satellite circling around the earth and broadcasting the blockchain or receiving and sending transaction without interruption. https://blockstream.com/satellite/ They have ...
Saxtheowl's user avatar
  • 2,800
1 vote
Accepted

Offline Bitcoin Wallet

The only thing you need to spend bitcoins is a Private Key, I recommend that you create a Private Key beeing offline, then import it to Bitcoin Core wallet or Electrum Bitcoin wallet (if you don't ...
Fabricio Espinoza's user avatar
1 vote

Taking out bitcoin from offline wallet

Yes, bitcoin is divisible to the 0.00000001 bitcoin, we call this small amount the "Satoshi" for example so even if you got less than 1 bitcoin you have a pretty wide margin on what amount you want to ...
Saxtheowl's user avatar
  • 2,800
1 vote

how to get bitcoin off an exchange?

Receiving funds in Bitcoin is an asynchronous and passive process. A sender creates a transaction which consumes some unspent transaction outputs (UTXO) and assigns the freed-up value to newly ...
Murch's user avatar
  • 75.7k
1 vote
Accepted

What really happen when user moves fund between Main Account and Trading Account in HitBTC?

This is purely an internal accounting move, no keys are involved. Their comparison to a hot/cold valid is likely just an analogy. In reality, their application layer (or some middleware) enforces ...
Raghav Sood's user avatar
  • 17.1k
1 vote

Signing a bitcoin transaction OFFLINE fails

I have a very old Greg Maxwell tutorial for this slightly old question https://web.archive.org/web/20171124193914/https://people.xiph.org/~greg/signdemo.txt The tutorial uses 'bitcoind' as the command ...
Louis Thompson's user avatar
1 vote

Generating paper wallet offline with liteaddress GitHub download

Yes, you open the HTML file in a web browser. You can use either bitaddress.org.html or index.html Just so you know, none of the files are signed, so you can't verify the authenticity. I believe ...
Chak's user avatar
  • 1,301
1 vote
Accepted

Eliminating all private keys records from pc

What you describe has some risks: The new PC and router likely won't have the latest software updates, which could increase the chance of it being compromised immediately The bitaddress.org website ...
Highly Irregular's user avatar
1 vote

What if I receive bitcoins when my device is powered off?

Money (BTC transaction) is being send from one wallet to another, that is being recorded in a book (public ledger), which is written by many people (miners) and kept securely by other people (BTC ...
remedcu's user avatar
  • 1,093
1 vote

What if I receive bitcoins when my device is powered off?

Yes. You can even send bitcoins to 'cold storage' or a 'brainwallet', which is pretty amazing IMHO!
Dan Bolser's user avatar
1 vote

Settling offline transactions

I'd say there are number of issues at play here. If the system is "offline" then the only update you'll have to balances is whatever was last stored. The assumption here is both sources are trusted, ...
cleanmarker's user avatar
1 vote

How to BIP38 existing private keys offline

The Bitcoin-Explorer (bx) v3.0 implementation described below has had FULL BIP 38 functionality for over a year, and has extended BIP 38 to numerous altcoins. See 5) Extended AES256Encrypt and ...
skaht's user avatar
  • 3,067
1 vote

Does a thin client testnet wallet exist which allows offline signing?

It looks like a testnet option was merged in early 2017, but I'm not sure if it was released: https://github.com/spesmilo/electrum/commit/d042d6e970389f97331e9caae196bf7a3af1e293 https://github.com/...
Rich Apodaca's user avatar
  • 2,421
1 vote

Does a thin client testnet wallet exist which allows offline signing?

Testnet transactions have the same format as mainnet transactions, so you can just create a raw transaction on your online testnet wallet, and get it signed by Electrum with a private key it thinks is ...
maservant's user avatar
  • 1,041
1 vote

Does a long time storage wallet need to be online?

Yes, except step 3 is unnecessary and wasteful of your storage space. A Bitcoin wallet is just a collection of private keys associated with addresses that have received transactions and therefore hold ...
maservant's user avatar
  • 1,041
1 vote

Noob questions about transfering and offline security

Transaction fees occur for each individual transaction and .04 btc is far too large for one transaction fee. You should open a ticket with Coinbase in order to receive an answer that will not ...
Luke's user avatar
  • 148

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