Interface HeartbeatTransactionParams

Requests the challenge fee discount: when set, the required fee is reduced by one min fee. The network verifies that hbAddress is actually under challenge before granting it, and a heartbeat claiming the discount may not carry any extra fields (note, lease, group, etc.).

Only allowed once transaction size pricing is enabled. Before that, the discount was inferred from an underpaid singleton heartbeat instead.

Must match hbAddress account's current KeyDilution.

Signature using HeartbeatAddress's partkey, thereby showing it is online.

The block seed for the this transaction's firstValid block.

Must match the hbAddress account's current VoteID