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Awesome.

It would be nice to be able to specify both a primary and a fallback (lno...) address.

This would enable people to use a service like coinos.io or second.tech to collect bitcoin that couldn't be delivered to the primary address. (N.B. coinos helpfully has a 'sweep' feature that sweeps bitcoin to other address you specify, periodically, or once a value threshold is reached).

Client-side logic would then switch from the primary address to the secondary address after P miliseconds or Q failed attempts at the primary.

Justin - Bolt 12 has a whole shopping list of benefits over Bolt 11 inc. significantly better gossip.