Understand it before you sign it
Understand it before you sign it.
Almost everything that goes wrong in crypto goes wrong at a moment the user did not understand — a signature that authorised more than it appeared to, a transfer counted as a disposal, a lock-up nobody mentioned. This site explains those mechanisms and stops there.
Most crypto writing is either selling you something or explaining what a price did yesterday. Neither helps when a wallet asks you to approve a transaction and you cannot tell what it will do.
What this site covers
The mechanics. What a private key is and why a public one can be published. What a seed phrase reconstructs and what it does not. What a token approval leaves behind after you close the tab. Why a swap between two coins is usually a taxable disposal even though no currency moved. These are facts about how the system works, and they do not change with the market.
What it does not do
No prices, no predictions, no coin worth watching. A number that is right today is wrong by the time you read it, and a site that tells you what to buy has a reason for it that you cannot see from the outside.
No trust scores, no security ratings, no claim that anything has been audited or verified here. Assessing whether a project is safe requires work this site does not do, and a confident score that came from nowhere is worse than no score — it is the thing that gets someone to connect a wallet. What you will find instead is how to make those checks yourself.
And not advice
Nothing here is financial, tax or legal advice. Tax treatment in particular varies enormously between countries and is unsettled in several areas even within one; where that is true, the page says so rather than picking an answer and sounding certain.
Keys, phrases and the ways people lose them
What a private key is, what a seed phrase actually protects, how drainers and approvals work, and how to read a signature request before you agree to it.
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BIP39 Passphrase (25th Word): What It Does and Its Risks
Learn how the BIP39 passphrase (25th word) creates a separate wallet, its security benefits, and the critical risk of losing access with no recovery.
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Cold Storage Crypto: Degrees of Offline Security
Understand cold storage crypto: what air-gapped wallets do, how they protect keys, and the real trade-offs of offline signing.
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Public and Private Keys: How the Pair Works
Understand the public-private key pair: what each key does, how addresses derive from public keys, and what signing proves. Essential for crypto security.
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What a Seed Phrase Actually Is
Learn what a seed phrase really is: the master key to all your crypto. Understand how it works, why it's not a password, and how to keep it safe.
How the machinery works
Gas, staking, rollups, liquidity pools and slippage — the mechanisms, so the next unfamiliar screen is one you can reason about.
How crypto is taxed
Which events create a liability, how cost basis is calculated, and where the rules genuinely differ by country rather than being simplified away.
The questions people arrive with
Someone got into my wallet without my seed phrase. How?
Almost always an approval rather than a key compromise. Connecting to a site and signing its request can grant a standing permission to move a token, and that permission survives closing the tab. Check what approvals your address has granted and revoke the ones you do not recognise; the key itself is usually still safe.
Is a hardware wallet enough to keep my crypto safe?
It solves one problem completely: the private key never leaves the device, so malware on your computer cannot extract it. It does nothing about the other two ways people lose funds — approving a malicious transaction, which the device will happily sign, and losing the seed phrase that was written down when it was set up.
Do I owe tax if I swapped one coin for another and never cashed out?
In most jurisdictions yes: disposing of one asset to acquire another is a disposal, and a gain or loss is calculated at that point even though no ordinary currency was involved. This is the single most common surprise on a first crypto tax return. Rules vary by country, so confirm yours.
Why did my transaction cost gas when it failed?
Because the network performed the computation regardless of the outcome. Gas pays validators for the work of executing your transaction, and work was done before it reverted. A failure that consumes the whole gas limit usually means the contract rejected the call rather than that the network was busy.