This transaction will be rejected if not included in a block after a while (default: ~5 minutes)
The number of blocks the for which the transaction remains valid. Target block time is 6 seconds. The default should suffice for most use cases
this value will get rounded up to the closest power of 2, e.g.
65 rounds up to
this value should not exceed 4096, which is the chain's
BlockHashCount as the lesser of the two will be used.