Svindel og scams
What are you actually signing?
A wallet drainer does not steal keys; it gets you to approve a transaction or signature that grants access to your tokens.
Approvals: permission without a limit
Token standards let you allow a contract to move tokens on your behalf, and many apps request unlimited allowance by default.
That permission stays valid until revoked, so a contract compromised months later can still move your balance.
Permit signatures
A permit is a gasless signature. It feels harmless but can grant the same permission as an approval.
Always read the domain and message type; refuse unknown spenders or huge values.
- Always check spender and amount
- Be extra critical of gasless signatures
- Use a separate wallet for experiments
Reviewing and revoking
A revoke tool shows which contracts have permission on your address; review quarterly and revoke what you do not use.
Revoking costs gas but far less than the average drainer.
Compartmentalise
Split addresses: a cold wallet that never connects to sites, a hot wallet for daily use, and a burner for unknown claims.
This limits the damage of a mistake to one compartment.
Ofte stilte spørsmål
What is a wallet drainer?
Malicious site code that tricks you into an approval or signature letting it move your tokens or NFTs.
How do I revoke approvals?
Through your wallet's revoke function or a known revoke tool, confirming a transaction that sets the allowance to zero.
Does a hardware wallet protect me?
Only if you read the device screen; a signed malicious transaction is valid from hardware too.
Les videre
Phishing and fake support in crypto
Fake emails, fake support agents and cloned websites: how the attack works and which habits protect you.
Rug pulls: how a project takes your money
Tokenomics, liquidity, anonymous teams and contract permissions: the checks that reveal whether a project can take your money.
Reading a transaction in the block explorer
Hash, confirmations, gas, status and addresses: what every field means and how to judge a stuck transaction.