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The Coldcard RNG failure is a reminder that entropy is the most overlooked part of Bitcoin self-custody.
I've just updated my interactive explainer on entropy and mnemonic seeds to cover what happened: 
If you're affected by this issue, secure your funds first - don't wait.
How secure is your Bitcoin wallet
What makes your Bitcoin wallet
If you're in the UK, you can't buy bitcoin on a centralised exchange until you pass a test. The FCA calls this an "appropriateness assessment", and it’s supposed to prove you understand how risky and volatile it all is. This is a routine bit of friction that UK stackers will be familiar with.
But last week a thought struck me: what if they made you pass a test before opening an ordinary fiat bank account? Prove you understand where your money actually goes, who legally owns it, and how much of it is really protected?
So I built it! Ironically I expect only bitcoiners will be able to pass it.
The fiat banking knowledge test: an FCA thought experiment
Before you can buy Bitcoin in the UK, the FCA makes you pass a knowledge test on its dangers. So what would that test look like if the same standar...
Just published an interactive explainer on the Lightning network ⚡️ It includes a liquidity routing puzzle, which I think is a fun way to grasp the channel liquidity concept.
As always, comments and shares appreciated. Keep stacking. #bitcoin #lightning
How the Lightning Network actually works
Lightning settles millions of payments without touching the blockchain. Interactive diagrams explain payment channels, multi-hop routing, and the l...
Just published my explainer + tutorial on Silent Payments (BIP-352): 
Publish one reusable `sp1` address and share it anywhere, yet every payment lands on a different on-chain address, with no public link between them. No XPUB, no sender interaction.
Sparrow + a Frigate server makes it practical to set up and test today, even without running your own node. #bitcoin #privacy
Silent Payments: a hands-on guide to better Bitcoin privacy
A hands-on guide to Silent Payments: set up a reusable, private Bitcoin address in Sparrow, understand the scanning key, and see how BIP-352 really...