allow to send sub-dust amounts in offchain transactions #592
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altafan
approved these changes
Jun 2, 2025
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This PR is handling sub-dust vtxo so that the server can treat them as expired VTXOs.
Sub-dust output are OP_RETURN output. These output types can be added to any offchain transactions.
sub-dust offchain tx output pkscript
Because they are OP_RETURN, they can't be spent again in another offchain tx. However, they can be registered in a settlement via BIP322 intent. To make the intent signature "standard" the
OP_RETURNis replaced byOP_1:sub-dust intent input pkscript
Thus, signing a subdust vtxo = signing a non-dust vtxo.
The sub-dust VTXOs can't be exited unilaterally, so they do not require forfeit transactions.
it closes #479
@altafan @Kukks please review