Common Crypto Security Mistakes and How to Check for Them
12 mistakes that end in lost crypto: a single seed backup, a photo in the cloud, a passphrase only you know. Each comes with a check you can do yourself.
Guides
Guides
How to keep crypto safe and how to prepare your family. No jargon, no investment advice.
Crypto in Your Will: What to Write and What Never to
How to leave crypto in a will under Polish law: handwritten or notarial form, vindication legacy, notary deposit, and why the seed never goes in the will.
Inheritance Tax on Crypto in Poland: SD-Z2 and the Deadline
Close family pays no inheritance tax in Poland but must report on form SD-Z2 within 6 months. When the clock starts, and what about selling the crypto later.
Crypto on an exchange after the owner dies: what heirs do
How heirs report an exchange account holder's death to Binance, Kraken, Coinbase or Bybit, which documents each names, and what Zonda hasn't published.
Access Instructions for Your Family: What to Include
What to put in your crypto access instructions for your family, what to leave out (seed, amounts), where to keep them and how to test that your family can cope.
Seed Phrase: How to Store It So You Don't Lose Your Bitcoin
How to store a seed phrase: 12 or 24 words, paper or steel, two copies in two places, what not to do and how to check that your backup works.
Power of Attorney, Incapacity and Crypto: What Family Can Do
A power of attorney won't open a wallet, because the network doesn't know attorneys. What a POA and guardianship give, and how to describe access for illness.
Inherited Crypto: What to Do, in What Order, and What to Avoid
Found a Trezor, a paper with 24 words or a wallet app after a relative died? What not to do, the order of steps and how to check the balance safely.
2-of-3 Multisig Wallet: Who It Suits and What It Costs
A 2-of-3 multisig wallet for bitcoin: how it works, when it pays off, what it costs and why two seeds alone aren't enough without a wallet configuration backup.
Passphrase, the 25th word: hidden wallet and the risk of loss
A passphrase adds an extra password to your recovery phrase and creates a hidden wallet. Forget it and the funds are gone. How to explain it to family.
Splitting your seed with Shamir (SLIP-39): how it works
SLIP-39 splits your recovery phrase into shares, and only some are needed to recover. Why cutting 24 words by hand fails and how Shamir differs from multisig.
What Happens to Your Bitcoin When You Die, and What to Prepare
Crypto passes into the estate like any other asset, but without keys and instructions your family can't touch it. What to do today so they cope without you.