Crypto & Bitcoin: questions and answers

United Kingdom 1

1. How can I check my National Insurance record online?

   You can check your National Insurance record online through GOV.UK. The record shows the years that count towards your State Pension and can help identify gaps or years…

Worldwide 21

1. How do I sell Bitcoin and move the money to my bank account?

   You normally sell Bitcoin through an exchange or broker, receive pounds or another supported currency in your cash balance, then withdraw that balance to a bank account…

2. What is the difference between kH/s, MH/s, GH/s and TH/s?

   kH/s, MH/s, GH/s and TH/s all measure hashes per second. Each step is 1,000 times larger: 1 MH/s equals 1,000 kH/s, 1 GH/s equals 1,000 MH/s, and 1 TH/s equals 1,000…

3. Can you mine Bitcoin with a normal PC?

   You can run Bitcoin mining software on a normal PC, but ordinary CPU or GPU hardware is not competitive with specialised ASIC miners for Bitcoin’s SHA-256 proof of…

4. What are Bitcoin days destroyed and other Bitcoin security risks?

   Bitcoin Days Destroyed, often called Coin Days Destroyed, weights spent Bitcoin by how long it had been held. It can highlight older coins moving, but it is a context…

5. What are Bitcoin miners actually solving?

   Bitcoin miners are repeatedly hashing block-header data while changing values such as the nonce until they find a hash below the network’s target. They are not solving…

6. How do I fix a Bitcoin wallet with no block source available?

   A “no block source available” style error usually means the wallet cannot obtain usable blockchain data from peers or a local node. Check the network connection, peer…

7. What is an mBTC and how do Bitcoin addresses and scripts work?

   An mBTC is one-thousandth of a Bitcoin, so 1 BTC equals 1,000 mBTC. Bitcoin addresses are human-facing ways to identify a payment destination, while scripts and witness…

8. How many Bitcoins will ever exist?

   Bitcoin’s issuance schedule was designed around a maximum supply of about 21 million BTC, with new coins entering through block subsidies that reduce over time. There…

9. How can I unstuck a low-fee Bitcoin transaction?

   A low-fee Bitcoin transaction can remain unconfirmed while miners prefer higher-fee transactions. Depending on the wallet and transaction, you may be able to use fee…

10. How do I calculate the hash rate of a mining rig?

    A mining rig’s hash rate is the number of hash attempts it can perform per second. Use a manufacturer benchmark, a pool’s measured worker rate or a timed local test…

11. Is a Bitcoin USB miner worth using today?

    A USB Bitcoin miner is generally a learning or novelty device rather than a sensible way to earn mining income in 2026. Bitcoin mining is dominated by specialised ASIC…

12. How much Bitcoin can I mine with a particular mining rig?

    A mining rig does not mine a fixed quantity of Bitcoin each day. Expected output depends on its hash rate, current network difficulty, the block reward, pool fees and…

13. Where can you buy Litecoin safely?

    Litecoin can be bought through a supported cryptoasset exchange or other established provider that offers LTC trading in your country. Check the platform’s regulatory…

14. How can I find Bitcoin I may have bought years ago?

    Start with old exchange emails, bank records and wallet backups to identify where the Bitcoin was originally held. A Bitcoin address alone does not prove ownership; you…

15. Can you recover Bitcoin if the wallet and recovery phrase are both lost?

    Usually not, unless another valid backup or private key still exists. Bitcoin ownership is controlled by cryptographic keys, so losing both the wallet and every copy of…

16. Why does arbitrage between crypto exchanges not always work?

    Buying Bitcoin on one exchange and selling it on another can appear to offer a risk-free spread, but fees, withdrawal delays, limits, price movement and settlement risk…

17. How do I export a private key from an old Bitcoin Core wallet?

    If the wallet still exists and is unlocked, Bitcoin Core provides wallet RPC commands such as dumpprivkey for an address. The command reveals a highly sensitive secret…

18. How long does it take to mine a Bitcoin block?

    Bitcoin is designed around an average block interval of about 10 minutes, but the network does not produce one block like clockwork. Mining is probabilistic, so a block…

19. Are prediction-market bets and crypto taxable?

    Tax depends on the legal character of the transaction and the taxpayer’s jurisdiction. For U.S. taxpayers, gambling winnings are generally taxable, while crypto sales…

20. Can you buy Bitcoin without paying an explicit fee?

    Some platforms advertise zero commissions, but that does not mean the transaction is free. Costs can appear in the spread, currency conversion, deposit method…

21. How does the Bitcoin blockchain actually work?

    Bitcoin’s blockchain is a shared public ledger. Transactions are broadcast to the network, nodes check whether they follow the protocol, and miners compete to add valid…