No	Prev State	Counterparty	Action	Post State	Notes
1	OPEN	OPEN	INIT	OPEN(INIT)	N/A
2	OPEN	OPEN(INIT)	INIT	OPEN(INIT)	N/A
3	OPEN(INIT)	OPEN	INIT	OPEN(INIT)	update upgrade state and increment upgrade sequence
4	OPEN(INIT)	OPEN(INIT)	INIT	OPEN(INIT)	update upgrade state and increment upgrade sequence
5	OPEN	OPEN(INIT)	TRY	FLUSHING	N/A
6	OPEN(INIT)	OPEN(INIT)	TRY	FLUSHING	N/A
7	OPEN(INIT)	FLUSHING	ACK	FLUSHING	inflight packets exist in src
8	OPEN(INIT)	FLUSHING	ACK	OPEN(ERR)	our proposal is incompatible with theirs OR timeout of counterparty proposal is reached
9	FLUSHING	FLUSHING	ACK	FLUSHING	inflight packets exist in src (No Transition)
10	FLUSHING	FLUSHING	ACK	COMPLETE	no inflight packets in src
11	FLUSHING	FLUSHING	ACK	OPEN(ERR)	our proposal is incompatible with theirs OR timeout of counterparty proposal is reached
12	FLUSHING	FLUSHING	CONFIRM	FLUSHING	inflight packets exist in src (No Transition)
13	FLUSHING	FLUSHING	CONFIRM	COMPLETE	no inflight packets in src
14	FLUSHING	FLUSHING	CONFIRM	OPEN(ERR)	timeout of counterparty proposal is reached
15	FLUSHING	COMPLETE	CONFIRM	FLUSHING	inflight packets exist in src
16	FLUSHING	COMPLETE	CONFIRM	OPEN	no inflight packets in src
17	FLUSHING	COMPLETE	CONFIRM	OPEN(ERR)	timeout of counterparty proposal is reached
18	COMPLETE	COMPLETE	OPEN	OPEN	counterparty sequence == current sequence
19	COMPLETE	OPEN	OPEN	OPEN	counterparty sequence >= current sequence
20	OPEN(INIT)	*	CANCEL	OPEN(ERR)	caller has authority
21	OPEN(INIT)	*	CANCEL	OPEN(ERR)	caller doesn't have authority && error receipt corresponding to current or future secuence exists on counterparty, and update the current
22	FLUSHING	*	CANCEL	OPEN(ERR)	caller has authority
23	FLUSHING	*	CANCEL	OPEN(ERR)	caller doesn't have authority && error receipt corresponding to current or future secuence exists on counterparty, and update the current
24	COMPLETE	*	CANCEL	OPEN(ERR)	error receipt corresponding to current secuence exists on counterparty
25	FLUSHING	OPEN	TIMEOUT	OPEN(ERR)	counterparty sequence >= current sequence && counterparty is failed to upgrade with the current proposed upgrade
26	FLUSHING	FLUSHING	TIMEOUT	OPEN(ERR)	counterparty sequence >= current sequence
27	COMPLETE	OPEN	TIMEOUT	OPEN(ERR)	counterparty sequence >= current sequence && counterparty is failed to upgrade with the current proposed upgrade
28	COMPLETE	FLUSHING	TIMEOUT	OPEN(ERR)	counterparty sequence >= current sequence