Bitcoin Wallets & Self-Custody
Three Keys From the Same Vendor Are Not Multisig
Multisig only protects you if your keys can't fail together. Same-vendor keys share one RNG, one firmware, one supply chain — one failure, t…
If you know what this means: congratulations, you’re likely fine. If you don’t, your bitcoin may depend on it. Find out which one you are →
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Bitcoin Fundamentals
Blockchain, proof of work, transactions, and the monetary revolution.
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Wallets & Self-Custody
Seed phrases, hardware wallets, and taking control of your Bitcoin.
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Mining & Economics
ASIC mining, halving cycles, ETFs, and Bitcoin's economic forces.
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Run your own node, open channels, become Bitcoin infrastructure.
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Security & Privacy
CoinJoin, multisig, UTXO management, and inheritance planning.
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Expert guides trusted by thousands of Bitcoiners worldwide
Bitcoin Wallets & Self-Custody
The Coldcard Seed Entropy Flaw (July 2026): Who's at Risk and Exactly What to Do
A firmware bug made some Coldcard devices generate weak, guessable seeds — and ~594 BTC was swept from ~500 wallets. Who is affected, and th…
Bitcoin Privacy
Coin Control in Sparrow Wallet: Label and Freeze UTXOs So You Never Merge KYC and No-KYC Coins (2026)
Coin control in Sparrow lives in the UTXOs tab: turn on the UTXO view, label every coin by source, freeze tainted or dust UTXOs, and pre-sel…
Bitcoin Nodes & Infrastructure
Bitcoin Core vs Bitcoin Knots in 2026: Which Node Software Should You Run?
Bitcoin Core vs Bitcoin Knots in 2026, explained without tribalism. Both run identical consensus rules — the choice is about relay policy. C…
Bitcoin Education & Beginners
Buy Bitcoin Without ID Verification: A Safe, Honest Guide for Beginners (2026)
Can a normal person buy bitcoin without ID, and is it safe and legal? Plain-language answer up top, then the real no-KYC options ranked by e…
Bitcoin Privacy
Do Bitcoin ATMs Require ID? The Honest Truth (And What to Do Instead)
Do Bitcoin ATMs require ID in 2026? Almost always yes — a phone number is universal and photo ID kicks in fast. Here are the real thresholds…
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since last block —
each tick = 10 min · click a spike to inspect
—since last blocktarget ~10 min
—difficulty period
—to next halving
waiting for network data — nothing here is ever made up