Helper struct for offline signing
### deserialize(serialised_data): [PreparedTransactionData](#preparedtransactiondata)
Turns a serialized preparedTransactionData string back into its class
| Parameter | Type | Description |
| --------------- | -------- | -------- |
| serialised_data | String | The serialised transaction data |
### essence(): [Essence](#essence)
Transaction essence
### addressIndexRecorders(): [AddressIndexRecorder[]](#addressindexrecorder)
Required address information for signing
### serialize(): String
Serializes the prepared data into a json string