Joint accounts are very useful. What one can do is issue stock at zero cost, have onchain accounting, be worldwide distributed etc., without the involvement of

Joint accounts are very useful. What one can do is issue stock at zero cost, have onchain accounting, be worldwide distributed etc., without the involvement of a lawyer or accountant. These things already exist in primitive form. For example there are already online communities with trusted members who provide escrow functions to manage the funds (basically an onchain Bitcoin foundation). Most of these things are being developed with Proof-of-stake systems, since they are already inherently based on explicit voting. Blocks get produced by vote of stake. While in Proof-of-work the computer doing the voting can change very frequently in PoS it's more constant. A good (old) paper in this respect is b-money: http://www.weidai.com/bmoney.txt http://www.weidai.com/bmoney.txt