OZY - Oct 10 - A growing wave of blockchain-based apps are using the distributed ledger to offer services that commit to transparency and safety. Ponder launched in 2017, and has now 70K users. Its blockchain-based service doesn't just connect people for dates; it also allows others to play matchmaker - and earn from it in cryptocurrency. Singapore-headquartered Viola.AI uses blockchain to build a global relationship registry that is transparent, open and accessible to all. The technology creates smart contracts and digital wallets for users that allow Viola.AI to verify their identity. Its AI engine tracks down common interests and backgrounds to find sharper matches than would be possible with standard dating app algorithms. DateCoin, which had its ICO in May 2018, combines neural networks and AI algorithms with blockchain to promise a more secure and transparent dating experience.