What is the best product you've seen lately for blockchain?

21.co finally makes micro-transactions and micro-attention usable on the web. People's time is worth money but until now it was too difficult to get paid for it. 21+Bitcoin makes it viable. (disclaimer: investor, but I invest in anything I like in the space)

I'm obviously biased, but I think 21.co is pretty good :) Aside from our own product, big fan of our friends at Coinbase. I think what we're doing with 21.co makes blockchains/digital currency actually useful for normal people and for businesses. See previous Product Hunt thread here. And I think Coinbase is a wonderful on-ramp for anyone to get into Bitcoin, Ethereum, and now Litecoin and other digital currencies.

Nuo is a decentralized crypto banking platform.

Could be a viable way for video creators to get paid directly by consumers.

Simple Copyright for creators using the blockchain.