This was presented by Vladimir Komendantskiy.

Polymesh is a blockchain for financial securities. It is built on the Substrate framework written in Rust. Around this time the valuation of all projects built on top of Substrate reached $5 billion.

Vladimir described what blockchain securities are and gave examples of operations on them in Rust: settlement, corporate actions, and confidential transactions.

He showed how a WASM runtime can be constructed on Substrate and how it is upgraded on the fly without restarting the network nodes. He talked about the zero-knowledge cryptography behind confidential transactions (MERCAT) and showed smart contracts written in Ink! (a Rust-based DSL).