if it's non-null, it means it was found in one of the transaction outputs, but it does not
mean that the handle is valid - it could still have total supply >1
if it's null, it means handle was burned, but it does not mean that the handle is invalid,
as it could also be burned as a corrective action.
Last effect on this handle in this block.
null, it means it was found in one of the transaction outputs, but it does not mean that the handle is valid - it could still have total supply >1null, it means handle was burned, but it does not mean that the handle is invalid, as it could also be burned as a corrective action.