In addition to Chytrik's mentioned of a dust attack, dust limit transactions are also used heavily by the Omni Layer to identify the recipient of an omni asset. Transactions such as those will follow pattern of one dust (or near dust) output, an OP_RETURN output, and a change output.

While dust attacks tend to create thousands of dust outputs in a handful of transactions, omni layer transactions will only create a single dust output per transaction.

In addition to Chytrik's mention of a dust attack, dust limit transactions are also used heavily by the Omni Layer to identify the recipient of an omni asset. Transactions such as those will follow pattern of one dust (or near dust) output, an OP_RETURN output, and a change output.

While dust attacks tend to create thousands of dust outputs in a handful of transactions, omni layer transactions will only create a single dust output per transaction.