At any rate, it got me thinking, can we layer on revocability somehow without any protocol change, as an opt-in?

My initial scheme is a trusted (hah) escrow service that issues time promises for signing. If it doesn't receive a cancel message, it will sign at the end of the time. 

The addresses would be listed by the escrow service, or in an open registry, so you could see if you were going to have a delay period when you saw a transaction go out.

This seems sort of poor to me, it imagines that mythical thing, a trusted escrow service, and is vulnerable to griefing, but I thought I'd see if some of the brighter minds than me can come up with a layer-on approach here.

When I think about it, I can imagine that I would put a good number of my coins in a one day reversible system, because I would have warning if someone wanted to try and spend them, and could do something about it. I'm not sure if it gets me anything over a standard escrow arrangement, though.

Peter
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