Blockchain has shaken up the payments world. Bank transfers, especially across borders, are slow, unpredictable and prone to error –and they can be expensive. But blockchain is fast, predictable and inexpensive. 1) What’s the state of play –upsides, downsides? 2) Who’s using blockchain and who’s about to start? 3) Why does this matter to shake up the payments world? 4) What are the best sites/references for people wanting to get up to speed fast? I’m a freelancer, writing this piece for BAI.org.