Is your wallet caught in a known failure?
The conclusion of this site is stop worrying about being found by chance, and worry about careless handling instead. But no amount of careful handling helps if the wallet generated the key badly. That is not the user’s fault, and it has happened repeatedly.
Below are the incidents that have been publicly confirmed. Click the one you use — it shows how far the entropy fell, which puzzle that corresponds to, and what to do next.
The list above holds publicly confirmed incidents only. Not appearing on it is not proof of safety. The general rules:
- · Keep wallet software and firmware current. Most incidents become public after the patch ships.
- · The longer a wallet has sat untouched, the more risk it carries — it may have been safe when created and the flaw found later.
- · Don't leave large amounts on an old seed. Move them to a seed freshly generated on current hardware.
This tool does not ask for a seed, a private key, or an address. A site that offers to “check whether your wallet is safe” and then asks for your seed is running exactly that con. A real check means finding your device on a list, not handing your secrets to someone else.
If you want to check for yourself, do it offline and by eye only — view the private key as 64 hex digits and a run of leading zeros means something is wrong. A healthy key is filled from the first digit. Digit-by-digit comparison