It could be interesting to bootstrap a PoS network using the wallet keys for all existing public blockchains, by allowing users to initialize their PoS wallet w

It could be interesting to bootstrap a PoS network using the wallet keys for all existing public blockchains, by allowing users to initialize their PoS wallet with the fiat value of their PoW keys held at some agreed moment in time. I toyed with this idea for a while, but I don't know how you could keep the network secure until a significant proportion of the total value has been claimed. Anyway, I'd also be interested to know if there's existing or active research along these lines.