The video and tweet shown above demonstrates this persons ability to unlock their front door using Ethereum. His post goes on to detail that the process verifies an NFT (ENS) ownership to do so.
NFT – Non Fungible Token – Digital proof of ownership of assets that lives on the blockchain – most recently you may have heard of art NFTs.
ENS – Ethereum Name Services are like domains, but point to things like Ethereum addresses, content hashes, or in this case an NFT (ownership) via an address
See more at ens.domains