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1. Is it safe to use a private key for an existing singlesig wallet as one of the keys for a new multisig wallet?

   The single-sig wallet will still work. Each key can be used in multiple wallets (singlesig or multisig) without interfering with the others....

2. What does it mean that the security of Bitcoin public keys and 256-bit ECDSA is 128 bits?

   What does it mean that the security of 256-bit ECDSA, and therefore Bitcoin keys, is 128 bits? I mean, if I have approximately 2^256 possibl...

3. How can vulnerabilites in bitcoin be responsibly reported?

   Information on current (ie, not past/public/resolved) security issues should be sent to the private [email protected] m...

4. Is 24 words seed safer than 12 words in terms of bruteforcing the private key

   Regardless of whether you have a passphrase or not 12 words is just as secure as 24 words because the resulting public key will still requir...

5. Does a clearnet connection to my lightning node not require a TLS certificate?

   Lightning network connections do not use TLS or certificates at all, as far as I know (note that this may be different for other types of co...