1. The first U.S. futures-based bitcoin ETF launched

2. Senators call on Facebook to shelve Novi

Also on Tuesday, Senate Democrats wrote a letter to Mark Zuckerberg, CEO of Facebook, in an effort to push the social media giant to end its digital wallet project, Novi.

The letter, which was written by Sens. Brian Schatz, D-HI.; Sherrod Brown, D-Ohio.; Elizabeth Warren, D-Mass.; and others, came after Facebook launched its Novi pilot program in the U.S. and Guatemala on Tuesday.

“Facebook cannot be trusted to manage a payment system or digital currency when its existing ability to manage risks and keep consumers safe has proven wholly insufficient,” the letter read. “We urge you to immediately discontinue your Novi pilot and to commit that you will not bring Diem to market.”

Diem, rebranded from Libra, is Facebook’s halted digital currency project. But, rather than use Diem, Facebook announced it plans to use a stablecoin called the Paxos Dollar. Novi would let users send and receive money using the Paxos Dollar, with Coinbase as its custody partner.

3. Worldcoin scans people’s eyes in exchange for free cryptocurrency

Silicon Valley tech millionaire Sam Altman launched a new start-up called Worldcoin, which claims it will give free cryptocurrency to those who verify their accounts by taking an iris scan.

Worldcoin says it has shipped its scanning devices to people in 12 countries.

Once users sign up by having their iris scanned, the image is encrypted and becomes