The leaks · 42 / 86

Approvals and drainers

An approval lets a contract move a token from your wallet later. A drainer is a page that asks for that permission, or for a signature, and then takes what it can.

The never-do list

Do not type the seed into a website.
Do not approve an unlimited spend for a site you opened from an ad or a DM.
Do not sign a message you cannot read.
Do not download a remote-access tool for support.

What an approval can take

If you approved a contract to spend your token, it can move the balance later, in a transaction you do not start. Revoke approvals you do not remember, using a tool you opened yourself.

This course will not teach you how to build a drainer. Knowing the permission is enough to refuse it.

Check yourself

If you approved a contract last month, can it still move tokens?

Yes, until you revoke that approval or the balance is gone.

After this you can refuse unlimited approvals from links, and revoke ones you do not recognise.

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