sad that a Bitcoin tx with 0 outputs is invalid. would be nice to donate dust to miners this way.

@jb55 I think @pete had a tool that would spend your dust to a particular output signed with SIGHASH_NONE (or something) so that multiple dust spends by different people could be aggregated together, splitting the cost of the output. For a 100,000 vbyte tx assuming all inputs are P2WPKH, you can split the 31 vbytes of output 1,475 ways for a relative cost of 0.02 vbytes per input---which is pretty close to zero.

Still, I agree with your point in principle.

@harding @jb55 @pete Nice, but why 31 vbytes output? An empty op_return with 0 value is sufficient, no? So ~10 vbytes?