You're maybe taking an overly simplistic view of the needs of financial institutions. In finance, the trustworthiness of the transactions themselves is pretty

You're maybe taking an overly simplistic view of the needs of financial institutions. In finance, the trustworthiness of the transactions themselves is pretty much a non-issue. The real issues are much more subtle. What's the likelihood that a counterparty actually has or can acquire the goods they're selling me? If I'm selling them a futures contract, what's the likelihood that they will have enough cash to make good on that deal at a future date? Does my bank have a healthy enough balance sheet that I will be able to get at my money when I need it? These are all problems that the financial industry has solutions for. They are admittedly imperfect and of varying quality. But what's there is a far sight better than what blockchain has been able to offer, which is approximately nothing. Hopefully I shouldn't have to do more than mention the names MtGox and Tether to drive this point home.