[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"guide:token-approvals-and-how-to-revoke-them::en":3,"guides-all::en":10},{"slug":4,"title":5,"excerpt":6,"topic":7,"updated_at":8,"body":9},"token-approvals-and-how-to-revoke-them","Token Approvals and How to Revoke Them","Most wallet drains are not stolen keys. They are permissions the owner granted once and forgot. Here is what an approval is and how to take it back.","wallet-security","2026-08-17T16:27:44+00:00","\u003Cp>To let a decentralised application move a token on your behalf, you sign an approval: a permission recorded on-chain that says a named contract may spend up to a certain amount of that token from your address. Swapping, lending and buying an NFT all begin with one. The permission is separate from the transaction that follows, and it does not expire on its own.\u003C\u002Fp>\u003Ch2>Why unlimited approvals are the problem\u003C\u002Fh2>\u003Cp>Many interfaces request an unlimited allowance by default, because it saves the user a second confirmation on every later interaction. The cost is that the contract keeps the right to move that token indefinitely. If the contract is later exploited, or was malicious from the start, or is upgradeable and its logic is swapped, the approval you signed months ago is what lets the funds leave — no key theft required.\u003C\u002Fp>\u003Ch2>How drains actually arrive\u003C\u002Fh2>\u003Cp>A fake mint page, an airdrop claim or a support impersonator asks you to sign what looks like a routine step. The confirmation screen shows an approval or a permit signature rather than a transfer, so nothing appears to move at the time. The transfer happens later, from the attacker's own wallet, using the permission you granted.\u003C\u002Fp>\u003Ch2>Reviewing and revoking\u003C\u002Fh2>\u003Cp>Use a reputable approval checker or your wallet's built-in permissions screen to list what each address has granted, per network — approvals are per chain, so a clean list on one network says nothing about another. Revoke anything you no longer use and anything unlimited on a contract you do not recognise. Revoking is itself a transaction and costs a network fee.\u003C\u002Fp>\u003Ch2>Habits that keep the list short\u003C\u002Fh2>\u003Cp>Set a spending cap instead of unlimited where the interface offers it, keep long-term holdings in a wallet that never interacts with applications, and read the confirmation screen for the word approve or permit before signing. A wallet that simulates transactions will show you the allowance in plain language.\u003C\u002Fp>\u003Ch2>The bottom line\u003C\u002Fh2>\u003Cp>Approvals persist until you cancel them. Review them periodically, prefer capped ones, and keep savings in an address that signs nothing.\u003C\u002Fp>",[11,17,22,26,30,35,39,43,47,52,56,60,64,68,72,76,80,84,88,92,93,97,101,105,109,113,117,121,125],{"slug":12,"title":13,"excerpt":14,"topic":15,"updated_at":16},"an-etf-share-or-the-coin-itself","An ETF Share or the Coin Itself","Both track the same price and they are not the same asset. What each one actually makes you own, the three-way choice most people mistake for a two-way one, and which risk you are picking up.","market-literacy","2026-08-18T03:30:02+00:00",{"slug":18,"title":19,"excerpt":20,"topic":21,"updated_at":8},"api-keys-and-third-party-trading-tools","API Keys and Third-Party Trading Tools","Bots, trackers and tax tools all ask for exchange API keys. What each permission actually grants, and the one you should almost never hand over.","exchange-safety",{"slug":23,"title":24,"excerpt":25,"topic":7,"updated_at":16},"bridging-crypto-between-chains","Bridging Crypto Between Chains Without Losing It","A bridge is a custody decision dressed up as a transfer. What the three designs actually do with your coin, why bridges are the most attacked component in crypto, and the checks that survive all of them.",{"slug":27,"title":28,"excerpt":29,"topic":7,"updated_at":8},"checking-a-crypto-address-before-you-send","How to Check a Crypto Address Before You Send","A crypto transfer cannot be recalled, and the most common way people lose money is sending to an address that was never the one they meant. Here is the check that catches it.",{"slug":31,"title":32,"excerpt":33,"topic":34,"updated_at":8},"crypto-tax-guide","The Crypto Records to Keep Before Tax Time","What you owe is set where you live, and this page does not touch it. What travels between jurisdictions is the record-keeping — and the fact that exchanges are not archives.","tax",{"slug":36,"title":37,"excerpt":38,"topic":7,"updated_at":8},"custodial-vs-non-custodial-wallets-explained","Custodial vs Non-Custodial Wallets Explained","The single biggest decision in how you hold crypto: who controls the keys, and what that means for security and responsibility.",{"slug":40,"title":41,"excerpt":42,"topic":21,"updated_at":8},"exchange-safety-checklist","How to Evaluate a Crypto Exchange's Safety","Before you deposit a dollar, run any exchange through this checklist — proof-of-reserves, custody model, licensing, and security track record.",{"slug":44,"title":45,"excerpt":46,"topic":7,"updated_at":8},"hardware-wallets-explained","Hardware Wallets Explained","What a hardware wallet actually protects you from, what it does not, and how to buy and set one up without undoing the point of owning it.",{"slug":48,"title":49,"excerpt":50,"topic":51,"updated_at":8},"how-crypto-withdrawals-work","How Crypto Withdrawals Work","Networks, addresses, confirmations and fees — what actually happens when you withdraw crypto, and the mistakes that make it unrecoverable.","crypto-basics",{"slug":53,"title":54,"excerpt":55,"topic":51,"updated_at":8},"how-to-buy-bitcoin","How to Buy Bitcoin for the First Time","The purchase takes ten minutes. What takes longer are the four decisions around it: where the coin will live, which venue may legally sell to you, and what the quote really costs.",{"slug":57,"title":58,"excerpt":59,"topic":15,"updated_at":8},"how-to-check-a-token-before-you-buy","How to Check a Token Before You Buy","Six checks you can run yourself on any token, with a block explorer and the contract. None of them require trusting the project's own description.",{"slug":61,"title":62,"excerpt":63,"topic":21,"updated_at":8},"how-to-check-an-exchange-licence-claim","How to Check an Exchange Licence Claim","A licence badge in a footer is a claim, not evidence. Four steps to verify it against the register, and what the answer does and does not cover.",{"slug":65,"title":66,"excerpt":67,"topic":15,"updated_at":8},"how-to-read-a-crypto-whitepaper","How to Read a Crypto Whitepaper","A whitepaper has no standard, no reviewer and no obligation to stay true. What to read first, what to verify elsewhere, and which sections to skip.",{"slug":69,"title":70,"excerpt":71,"topic":51,"updated_at":8},"how-to-spot-a-crypto-scam","How to Spot a Crypto Scam","The patterns behind almost every crypto scam are older than crypto. Learn the five that keep working, and the checks that defuse them.",{"slug":73,"title":74,"excerpt":75,"topic":15,"updated_at":8},"how-to-trade-futures","How to Trade Crypto Futures, Starting With the Risk","A perpetual costs you money whether you are right or wrong, and the venue picks the moment your position closes. The numbers to know before the entry, not after it.",{"slug":77,"title":78,"excerpt":79,"topic":15,"updated_at":8},"market-cap-and-supply-explained","Market Cap and Supply, Explained","Why a coin's unit price tells you nothing, what market cap actually measures, and the supply figures that quietly change the answer.",{"slug":81,"title":82,"excerpt":83,"topic":21,"updated_at":8},"proof-of-reserves-explained","Proof of Reserves Explained","What a proof-of-reserves report actually proves, what it quietly leaves out, and how to read one without mistaking it for a full audit.",{"slug":85,"title":86,"excerpt":87,"topic":51,"updated_at":8},"reading-a-block-explorer","How to Read a Block Explorer","A block explorer is the public record every claim about a transaction can be checked against. What the fields mean, and the three things worth verifying yourself.",{"slug":89,"title":90,"excerpt":91,"topic":7,"updated_at":8},"seed-phrase-security","How to Store a Seed Phrase Safely","Your recovery phrase is the account. Here is how to back it up so a fire, a flood, a thief or a phishing site cannot take your crypto with it.",{"slug":4,"title":5,"excerpt":6,"topic":7,"updated_at":8},{"slug":94,"title":95,"excerpt":96,"topic":21,"updated_at":8},"two-factor-authentication-for-crypto-accounts","Two-Factor Authentication for Crypto Accounts","Not all second factors are equal. Why SMS codes are the weakest option, what a security key does that an app cannot, and what to fix first.",{"slug":98,"title":99,"excerpt":100,"topic":15,"updated_at":8},"understanding-crypto-exchange-fees","Understanding Crypto Exchange Fees","Trading fees are the smallest part of what an exchange charges you. Here is where the rest of the cost hides, and how to measure it.",{"slug":102,"title":103,"excerpt":104,"topic":15,"updated_at":8},"what-a-smart-contract-audit-proves","What a Smart Contract Audit Does and Does Not Prove","An audit is a review with a scope and a date, not a guarantee. How to read one, and the four things a badge on a website never tells you.",{"slug":106,"title":107,"excerpt":108,"topic":51,"updated_at":8},"what-backs-a-stablecoin","What Actually Backs a Stablecoin","A stablecoin is only as stable as whatever stands behind it. The three designs, what an attestation does and does not prove, and the question that matters most.",{"slug":110,"title":111,"excerpt":112,"topic":21,"updated_at":8},"what-happens-when-a-crypto-exchange-fails","What Happens When a Crypto Exchange Fails","If an exchange freezes withdrawals or files for bankruptcy, what actually happens to your balance — and what you can do before that day.",{"slug":114,"title":115,"excerpt":116,"topic":51,"updated_at":8},"what-staking-actually-involves","What Staking Actually Involves","Staking is not a savings account. What you commit, what can reduce it, and the difference between doing it yourself and letting a platform do it.",{"slug":118,"title":119,"excerpt":120,"topic":7,"updated_at":8},"what-to-do-if-your-wallet-is-drained","What to Do If Your Wallet Is Drained","The first hour matters, and instinct gives the wrong advice. What can still be saved, what cannot, and why recovery services make it worse.",{"slug":122,"title":123,"excerpt":124,"topic":21,"updated_at":16},"when-an-exchange-freezes-your-withdrawal","When an Exchange Freezes Your Withdrawal","Most frozen withdrawals are a compliance review, not a collapse. How to tell which one you are in, what shortens a hold, and the signals that mean stop waiting.",{"slug":126,"title":127,"excerpt":128,"topic":51,"updated_at":8},"why-a-transaction-is-stuck","Why a Transaction Is Stuck, and What to Do","A pending transaction has not failed and has not happened. Why fees, ordering and nonces leave transactions waiting, and which fixes are real."]