Also covering Dust

Uneconomical outputs are transaction outputs that are worth less than the fees it will cost to spend them. To prevent users from creating uneconomical outputs that will increase the size of the UTXO set, Bitcoin Core and other nodes refuse to relay or mine transactions with outputs below a certain value, called the dust limit.

Terminology note: sometimes dust is used as a synonym for uneconomical outputs or, more generically, low value outputs. This can create confusion, such as in the case of dust attacks which involve amounts just barely above the dust limit. Optech recommends using uneconomical outputs for outputs that aren’t worth the cost to spend them, reserving the term dust for references specific to the dust limit.

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