(!tx_out.script_pubkey.is_op_return()).then_some(output)
              })
              .collect::<Vec<usize>>();

            if amount == 0 {
              // if amount is zero, divide balance between eligible outputs
              let amount = *balance / destinations.len() as u128;

              for output in destinations {
                allocate(balance, amount, output);
              }
            } else {
              // if amount is non-zero, distribute amount to eligible outputs
              for output in destinations {
                allocate(balance, amount.min(*balance), output);
              }
            }
          } else {
            // Get the allocatable amount
            let amount = if amount == 0 {
              *balance
            } else {
              amount.min(*balance)
            };

            allocate(balance, amount, output);
          }
        }

        // increment entries with minted runes
        for (id, amount) in mintable {
          let minted = limits[&id] - amount;