Learn Bitcoin, one block at a time.
Your guide to Bitcoin: how money works, how Bitcoin works, its economics and history, live charts, news, tools, and holding it yourself. Learn at your own pace and go as deep as you want.
11 self-custody guides4 calculatorsFree PDF guideCourse in progress: 19 modules planned
Learn
What money is, and how Bitcoin works
Start here →Block2Buy
Your first bitcoin, then move it off the exchange
→Block3Secure
A wallet holds your keys. Keep them safe
→Block4Go deeper
History, economics, live data
→Bitcoin news
Latest headlines
- BlackRock: Security Fears Are Driving Bitcoin Whales Into IBIT
· Bitcoin Magazine
- A Bitcoin block just neared a 2015 transaction record, but paid only $180 in fees
· CoinDesk
- Binance to Close Accounts in Four EU Countries Dec. 31, Charging Idle Balances From Nov. 29
· Bitcoin Magazine
- U.S. Regulators Drop $250 Travel Rule Plan, Crypto Language Too
· Bitcoin Magazine
- Kraken’s Dave Ripley: “That Was the Bear Market” and Bitcoin Is “On Our Way Out of It”
· Bitcoin Magazine
- Strive (ASST) Adds 29 Bitcoin for $2.2 Million as Weekly Buys Slow After Crossing 43,000
· Bitcoin Magazine
Bitcoin right now
Live from mempool.space, free public data · loading…On X
From Cold Hard Sats
Recent posts from our account.
- NOT GOOD: LNbits told every server operator to shut down on Nov 8. Attackers made fake accounts and pulled Lightning funds out. One operator reported 2,285,545 sats gone.View on
- Bitcoin's network fee isn't a percentage of what you send. It depends on how much space your payment takes up and how busy the network is. A lower fee can mean a longer wait. Check the fee and estimated wait in your Bitcoin app before you confirm.View on
- SCAM WATCH: A fake @Trezor Suite download page can steal your bitcoin. Your backup words let someone rebuild your wallet and spend your coins. A download never needs them. Only use your backup when you start recovery and your Trezor device prompts you.View on
- JUST IN: U.S. banks must stop moving money for crypto exchange MEXC Global within 30 days. Treasury's money-crime unit says MEXC moved at least $16 billion tied to Iran, North Korea, and Russia sanctions evasion. Would this change where you keep your bitcoin?View on
- Every bitcoin you buy leaves a public trail. One exchange now blurs it by default. Each buy or sell in @BULLBITCOIN_'s app pulls in coins from both sides of the trade, so people watching the blockchain can't easily tell which coins are yours. Would you keep that on?View on
- UPDATE: Brazil's @MercadoBitcoin says customers can log back in Monday, Nov 9, a week after its hack. Only to see balances. Withdrawals come back later, no date yet. When a company holds your keys, it decides when you get in. How long could you wait to get your bitcoin out?View on
- Russia's largest stock exchange, the Moscow Exchange, starts trading bitcoin Dec. 1. Ordinary investors must pass a test, then can buy up to 300,000 rubles a year, about $3,700, per broker. Paying with bitcoin stays banned there. Would you buy bitcoin you can't spend?View on
- Liquid, a side network for bitcoin, says every token on it is backed by a real bitcoin again. In September, a bug let an attacker pull out about 4,000 bitcoin. About 3,400 came back. Blockstream covered the rest, says board member Samson Mow. Would you hold a bitcoin IOU?View on
- Follow @coldhardsatshq
Posts open on X. Claims are ours and educational. Updated .
Self-custody guides
Hold your own keys, step by step
Move your bitcoin off the exchange
How to withdraw bitcoin from an exchange to a wallet you control: test your backup, check the receive address on the device, pick the Bitcoin network, send a small test, then send the rest.
Read the guide →Where is my bitcoin, really?
Your bitcoin isn't stored in your wallet. It's recorded on the blockchain, and your wallet holds the keys that let you spend it. Why that matters for backups, lost phones and thieves.
Read the guide →Why self-custody matters
What holding your own bitcoin keys means, what you gain, what you take on, and how to write a one-page threat model.
Read the guide →What is a seed phrase?
What a seed phrase is, why 12 or 24 recovery words rebuild the private cryptographic keys that let you spend bitcoin, and the rules that keep those words safe.
Read the guide →Choosing a hardware wallet
How to pick and buy a hardware wallet that resists tampering, with our dated verdicts and the safe update for each device.
Read the guide →Seed phrase backup
How to make a seed backup durable, private and tested, when to add a passphrase, and the 2026 weak-seed lesson.
Read the guide →Check your wallet backup
Not sure your recovery words were written down? How to find them in your wallet app, copy them to paper, test them, and what an iPhone does and doesn't save.
Read the guide →Charts & data
The big picture, backed by real sources
Bitcoin price since 2013, with its long-term trend
Price: Kraken public price history, monthly closes Sep 2013 to Oct 13, 2026. Trend: Giovanni Santostasi's power-law model, 10⁻¹⁷ × days since the first block5.83. A description of the past, not a forecast.
Inflation tracker
What $100 saved in September 2000 buys in September 2026. Prices nearly doubled, so the same savings buy about half as much. Source: U.S. Bureau of Labor Statistics, CPI-U.
Supply schedule
New supply is cut in half about every four years. See the halvings and lost coins.
Tools
Calculators and tools
Regular-buying calculator
Monthly dollar-cost averaging since 2013.
LiveSats-to-dollars converter
Live price converter.
HindsightPast-purchase calculator
What a past lump-sum buy would be worth today.
CPIInflation calculator
Dollar buying power since 1947, vs BTC.
LiveTransaction fees
Live fee estimates, and when to send.
SubscribersTradingView indicator
Shows long-term price ranges on a chart.
Private by design: the calculators run in your browser. Nothing you type leaves your device.
Videos
Cold Hard Sats Originals
Short explainers, made here. Plus the latest from Bitcoin channels on the videos page.
Most watched today
TradingView pack · 3 indicators
Get the Cold Hard Sats TradingView pack
Three Bitcoin indicators for your TradingView chart: see where price sits against its long-run averages, mark every halving, and test what steady weekly or monthly buying would have done. Every setting is adjustable.
- Cycle Zones
- Halving Cycles
- DCA Backtest
Pine Script for TradingView. A free TradingView account works. Educational, not financial advice.