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Five facts you can check yourself, then three quick questions.

  1. 1There will only ever be 21 million bitcoin.

    The limit is written into the code every node runs. By block 975,300 about 20.11 million BTC (95.8%) have been issued; the rest comes out in ever-smaller amounts until about 2140.

    Calculated from the issuance schedule at block 975,300 (blockchair).

    Why 21 million →

  2. 2Every 210,000 blocks, the reward for a new block halves.

    That is roughly every four years. Since April 2024 a miner gets 3.125 BTC per block; after block 1,050,000 it will be 1.5625 BTC. 74,700 blocks to go, ≈ April 2028 at 10 minutes per block.

    Blocks: blockchair.

    How the halving works →

  3. 3You don't need to buy a whole bitcoin.

    1 BTC = 100,000,000 satoshi (sats). At $74,283, $10 buys about 13,462 sats.

    Price: Coinbase, 10 Nov, 12:56 London.

    Sats calculator →What a satoshi is →

  4. 4Whoever holds the keys holds the coins.

    A wallet's seed phrase (12 or 24 words) is the key to its bitcoin. Coins left on an exchange depend on that exchange: in 2014 Mt. Gox stopped withdrawals with about 850,000 BTC reported missing.

    Wallets compared →Hacks & losses →

  5. 5No company runs Bitcoin.

    Satoshi Nakamoto published the whitepaper on 31 October 2008, and the network started on 3 January 2009. Today 20,593 reachable nodes check every block against the rules themselves.

    Nodes: btcnodes.io, 7 Nov 2026.

    Read the whitepaper →Nodes online →

Check what you learned

  1. 1. How many bitcoin will ever exist?

  2. 2. What halves at a halving?

  3. 3. Who controls the bitcoin in a wallet?

Go deeper: start in 5 steps Bitcoin explained, step by step

Tracker · Investigation #1 · Binance hack

Crystal Intelligence flagged the likely Binance hacker wallet. We follow its 18,270 BTC on-chain, block by block.

Still held by the hacker · 19 addresses
As of 30 Oct, 09:59 London (mempool.space).
18,270.20 BTC
≈ $1.36 B · BTC part of the hack · at $74,283
of 18,270.2 BTC taken on 29 Oct
Since the hack
11d 16:36:38
Left the trail
0.0 BTC
Last movement
29 Oct, 20:48 London437.7 BTC → bc1qxg0l4p…y7s9ra
On the flagged address
0.00 BTC
See where every coin went →Free AML check for your address →mempool.space ↗

Address bc1q0mtc2f…hl2mnm is flagged by Crystal Intelligence as the likely Binance hacker wallet. On-chain data: mempool.space, as of 30 Oct, 09:59 London. A tracker, not advice.

Live Bitcoin data and research where every number names its source. ETF flows, treasuries and network data on one page. Free, no sign-up. Alerts on SEC filings and large on-chain moves in Telegram, or a daily email at about 08:00 London.

Explore live dataStart from zero →ATM map →Bitcoin whitepaper →

No bank will open an account for an AI agent, but a Bitcoin key is enough. See how agents pay with Lightning →

Watch: Bitcoin in 1 minute

What Is Bitcoin? A Simple Explanation for Beginners
Bitcoin Wallets Explained: Hot vs Cold, Keys and Seed Phrase
How to Buy Bitcoin: A Simple Beginner's Guide

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Today’s numbers, each with its source.

BTC / USD price$74,283−0.71% 24hlive · Coinbase · 10 Nov, 12:56 London
Block height975,300mempool.spaceHashrate900 EH/sblockchair (24h)Spot ETF net flow−$201.0M9 Nov · Farside InvestorsBTC in treasuries4.09M371 entities · bitcointreasuries.netBlocks to halving74,700≈ 12 Apr 2028 · blockchair

4.09M BTC held by 371 tracked companies, funds and governments (as of 10 Nov 2026). The total includes 46,351 BTC declared by Ukraine's public officials personally, not coins held by the state. Sources on each tile.

What's new

🇸🇻 San Salvador, 11–12 Nov: Bitcoin Histórico✍ Seoul, 5–8 Nov: our pre-event guide₿ Plan ₿ Forum, Lugano Bitcoin wallets rated Free BTC AML check Michael Saylor & Strategy BTC A Cypherpunk's Manifesto (1993) Timothy C. May John Gilmore Lightning Network guide
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