# In case a signature is missing, we will only accept the tx when:
  # * The tx only has one input matching current lock hash and contract hash
  # * The tx only has one output matching current lock hash and contract hash
  # * The matched output has the same amount of capacity but more tokens
  # than the input
  # This would allow a sender to send tokens to a receiver in one step
  # without needing work from the receiver side.