[theptip]

It's not quite the same thing, but Stellar allows the implementation of pegged Assets (e.g. USD), though they are issued by an anchor that you must explicitly trust to redeem those deposits. That could be a bank or other well-capitalized institution however.

This is basically the BTC Tether model, except hopefully some anchors will step up that can actually complete an audit without breaking up with their auditors.

I'm not all that convinced that it will be possible to create a stable synthetic blockchain asset without either explicitly pegging to fiat (a la Stellar) or having a big and diverse enough slice of GDP flowing through the system so that speculative activities are a minority of transaction volume.