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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Address Poisoning: The Scam in Your Transaction History
An attacker plants a transfer from a lookalike address so a later copy-paste from history sends funds to them. Verify the middle, never the ends.
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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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Blind Signing: What It Is and Why It Matters
Blind signing shows a hash instead of a decoded transaction. Learn how it works, why hardware wallets ask for it, and how to avoid approving unknown actions.
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How Crypto Phishing Works: Attack Vectors and Defenses
Learn how crypto phishing attacks operate, from fake wallet sites to malicious airdrops, and how to protect your keys and signatures.
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Crypto Recovery Scams: How the Second Theft Works
How crypto recovery scams target people who already lost funds: the upfront fee, the fake investigator, the unlock payment, and what real reporting routes can do.
Wallets, and what they do not do
Hot against cold, custodial against self-custody, and an honest account of what a hardware wallet protects you from and what it leaves entirely up to you.
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Custodial vs Non-Custodial Wallets: Key Differences
Compare custodial and non-custodial wallets: who holds keys, recovery options, control trade-offs, and what each approach does not protect against.
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How to Choose a Crypto Wallet: A Practical Guide
Learn how to choose a crypto wallet based on your needs. Compare wallet types, security trade-offs, and what each approach does not protect against.
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Derivation Paths: The Seed Restored but Nothing Is There
One seed generates many address trees and wallets disagree on the default. Read the path notation and check another before concluding anything is lost.
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Hot vs Cold Wallets: Trade-Offs and Gaps
Compare hot and cold wallets: security, convenience, and what each does NOT protect against. Learn the gaps and why most users use both.
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Smart Contract Wallets: A Wallet That Is a Program
Recovery without a seed phrase, spending limits and batched approvals, against deployment cost, per-chain addresses and dependence on the contract's code.
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Crypto Wallet Addresses: Formats and Cross-Chain Risks
Understand crypto wallet address formats across chains, why the same address differs by network, and how to avoid sending funds to the wrong network.
How the machinery works
Gas, staking, rollups, liquidity pools and slippage — the mechanisms, so the next unfamiliar screen is one you can reason about.
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How Crypto Bridges Work: Lock, Mint, Burn
Learn what a crypto bridge does with your original asset—locked, burned, or custodied—and why bridges are a top source of crypto losses.
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Finality and Confirmations: When Is It Settled?
Proof of work settles by depth, proof of stake can finalise explicitly. What a reorg undoes, and why exchanges pick different confirmation counts.
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How Gas Fees Work: What You Pay For
Understand what gas fees are, why they vary with network demand, and why failed transactions still cost you. Learn the base fee and priority fee split.
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Gas Limit vs Gas Price: What Each Number Does
Understand the difference between gas limit and gas price, what happens when the limit is too low, and why high estimates may signal contract issues.
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How Staking Works: Validators, Lock-ups, and Slashing
Learn the mechanics of crypto staking: validators, delegation, lock-ups, unbonding, and slashing risks. Understand what your coins actually do.
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Impermanent Loss: How It Works and When It Applies
Understand impermanent loss: why liquidity pools rebalance against you, when it becomes permanent, and how it interacts with trading fees.
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.
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Airdrop Tax: What Counts as Income and When
Learn how airdrops are taxed: whether they create income, at what value, and the trap of tax on tokens that later become worthless. Country-specific rules vary.
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Capital Gains on Crypto: How Gains Are Taxed
Learn how crypto capital gains are calculated, the difference between realized and unrealized gains, and why holding period matters. Tax rules vary by country.
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Crypto Cost Basis: FIFO, LIFO, HIFO Explained
Understand crypto cost basis methods: FIFO, LIFO, HIFO, and specific identification. See how each affects taxes and which jurisdictions allow them.
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Donating Crypto to Charity: Appraisals and Basis
Donating appreciated crypto held long enough can avoid the gain and support a deduction. The appraisal requirement above a threshold is the practical trap.
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How Crypto Is Taxed: The Events That Count
Learn which crypto transactions create a tax liability and which don't. Rules vary by country, so know what to check for your jurisdiction.
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What Crypto Tax Software Actually Does
Learn how crypto tax software imports transactions, matches transfers, and applies cost basis. Understand its limitations and what you must verify manually.
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.