Bitcoin · 05 Oct · 6 min read
What Are UTXOs?
UTXOs are the unspent outputs that make up a Bitcoin balance. See how wallets spend them, why change comes back to you, and how they affect fees.
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A stuck Bitcoin transaction usually means the fee was too low. Learn how to check it, bump the fee with RBF or CPFP, and what to do if an exchange sent it.
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The Lightning Network moves Bitcoin payments off-chain through payment channels. Learn how channels and routing work, what it costs and where its limits are.
Is Bitcoin Anonymous?
Bitcoin is pseudonymous, not anonymous. Every transaction is public, and exchanges, address reuse and chain analysis can link addresses to real identities.
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Bitcoin Pizza Day: The Story of the First Real Bitcoin Purchase
On May 22, 2010, Laszlo Hanyecz paid 10,000 BTC for two pizzas, the first well-documented purchase of a real-world good with Bitcoin. Here is the full story.
Bitcoin Myths That Refuse to Die
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What Happens When All 21 Million Bitcoin Are Mined?
The last BTC is due around 2140, and the real cap is just under 21 million. Here is what changes for miners, fees and network security after that.
How to Estimate Bitcoin Mining Profitability
Estimate Bitcoin mining profitability with one formula: your share of hash rate, block rewards, BTC price, pool fees and power cost, with a worked example.
What Is Bitcoin Mining Difficulty?
Bitcoin mining difficulty resets every 2,016 blocks to keep blocks near 10 minutes. See the formula, the 4x limit and a worked adjustment example.