Cool idea I like the 100 Block call.. You would need this as a minimum to potentially stop Dust Attacks.
Or Even some type of Submarine Swap into Lightning as the people requesting the "social service" may be better off using Lightning if/when Dust is unspendable.
But again Shows importance of forward thinking UTXO management.
Dust Attacks
I think dusk attacks would be prevented by requiring the transaction to consolidate to a single UTXO. So you must have 1) At least three UTXOs with 2) Each having a maximum of X sats (dust threshold), and 3) All consolidate to a single address.
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