A payload which defines the inclusion set of other messages in the Tangle.

### essence(): [MilestonePayloadEssence](#milestonepayloadessence)

Returns the essence of a `MilestonePayload`.

### signatures(): [MilestoneSignature[]](#milestonesignature)

Returns the signatures of a `MilestonePayload`.

### validate(applicable_public_keys, min_threshold): void

Semantically validate a `MilestonePayload`.

| Parameter       | Type |  Description |
| --------------- | -------- | -------- |
| applicable_public_keys | String[] |  The public keys to use to validate |
| min_threshold | long |  THe minimum threshold for this to succeed (0...100) |

### id(): String

Computes the identifier of a `MilestonePayload`.