txn: add nonce cases (#272)

Fixture archives

Archive	SHA-256
block.tar.gz	6e0d808ad30155e6ccd50bbf76b30f4a2210d6e652d6aa18c9c09c2b5b92f2e1
cost.tar.gz	a003d70ff73e6d25603c63b9d336c55da4920af58494cfaab0612be470c3dfd7
elf_loader.tar.gz	d3b3a58bf6692183608760e9e75edbf2bf84ddc66fdec3803ea08df144ab6df6
gossip.tar.gz	6aac2a5fc6a80e8113367c82b22c60c5587a78f6a963175bdc4b2a37365b06bd
instr.tar.gz	45681150c7ad2289fd61eff6399016936ce00451263c42cb6da265385e9159c3
shred.tar.gz	85f87febc5d4f2a62e154a62bd00e936a41b23f6f0ed10cd1afb2acb179765ca
syscall.tar.gz	c020a998e9a2fac626f817bea75fc60073e38a6f6e8810e150e9dced9dd2727d
txn.tar.gz	b6acbd8aa1f9d497b0b643ebe4b95e6d873da8d3764464144df21895168b6839
vm_serialization.tar.gz	bd92f9c4d60889f09b45a26f0485137cf1efcaaad1b08b82105843f973fc4982