Phreeli, an anonymous US phone service, launched in the US. Bill payments are "paid" verified using zero-knowledge proof (ZK), and the platform does not need to know the identity or payment method. Zcash co-founder Zooko Wilcox served as an advisor, suggesting the use of zero-knowledge access passes. The bottom layer of the network is provided by T-Mobile, which has received about $5 million in financing in the past year.