Two years ago, Vitalik wrote a seminal post about the hard, unsolved problems in crypto:
vitalik.ca/general/2019/1… 🧵
vitalik.ca/general/2019/1… 🧵
One problem he talked about is sybil resistance, which is closely related to what is known as the “proof of unique human” problem. 
It would be very useful if everyone on earth could get, for example, a non-transferable NFT that proved they are a unique person while also protecting their privacy.
This would eliminate the need for captchas, provide new ways to fight spam & DDOS attacks, and enable better web3 voting systems, among other things.
Today we are announcing our investment in Worldcoin which is taking a new approach to solve this problem in a privacy-preserving way, using zero-knowledge proofs. worldcoin.org
The way I think about Worldcoin is it’s both a platform (proof of unique humanness) and app (airdrop of tokens to as many people as possible).
The platform and app reinforce each other. Without proof of unique humanness you couldn’t fairly distribute the tokens. The tokens create the incentive for people to prove unique humanness.
The team has made a lot of progress with over 100K beta users signed up. We are excited to back Alex and Sam and the Worldcoin team on this ambitious project.
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