We are used to think about Monero as privacy-oriented technology, but what it actually means? Let's briefly recap how Monero works nowadays and what is actually visible for external observer. Then let's take a look on Lightning (a Bitcoin layer), how it works and what kind of privacy it provides.

The goal of this talk is to have a quick overview of those two technologies and to compare them from privacy point of view.

Let's talk about Monero multisig:
- what is multisig
- how it works in Monero
- Schnorr aggregation
- Key cancellation attack
- In opposite to Bitcoin no one knows that it is a multisig wallet
- Multisig with arbitrary threshold (as in Monero)
- what is inside kex messages
- why there are so many rounds
- why founds formula is "Members - threshold + 2"
- why we need to do "export_multisig"
- what is inside this export
- when we should do export/import: periodically or before spending?
- CLI and GUI for Monero multisig
- example (video/screenshots or live demo)

Additionally I would like to talk a little about real-world use cases of Monero cryptotechnologies. For example, Monero multisig can be used for PGP keys for signing or decrypting messages or Monero ring signatures can be used for secure voting.