Shielded and transparent UTXOs with value less than 0.00005 ZEC are considered "dust" by zcash_client_backend; under ordinary circumstances they have no economic value because the fee required to spend such a UTXO is greater than the value obtained by spending the output. However, in many transactions there is the ability to "recover" such value by spending the UTXO as a grace input under ZIP 317. This circumstance presents several challenges:
How should the requirement to pay fees affect the visible balance of the wallet? Should fees that will be required to spend existing UTXOs be automatically deducted from the top-line wallet balance?
If a UTXO has value less than 0.00005 ZEC, how should its balance be included in the top-line balance? It's potentially possible to reclaim this nominal value as a grace input under ZIP 317, but it is not reliably possible to do so for each such input.
Shielded and transparent UTXOs with value less than 0.00005 ZEC are considered "dust" by
zcash_client_backend; under ordinary circumstances they have no economic value because the fee required to spend such a UTXO is greater than the value obtained by spending the output. However, in many transactions there is the ability to "recover" such value by spending the UTXO as a grace input under ZIP 317. This circumstance presents several challenges: