### index(): long

Returns the index of a `MilestonePayloadEssence`.

### timestamp(): long

Returns the timestamp of a `MilestonePayloadEssence`.

### parents(): [MessageId[]](#messageid)

Returns the parents of a `MilestonePayloadEssence`.

### merkleProof(): byte[]

Returns the merkle proof of a `MilestonePayloadEssence`.

### nextPowScore(): long

Returns the next proof of work score of a `MilestonePayloadEssence`.

### nextPowScoreMilestone(): long

Returns the next proof of work index of a `MilestonePayloadEssence`.

### publicKeys(): [PublicKey[]](#publickey)

Returns the public keys of a `MilestonePayloadEssence`.

### receipt(): Optional<[ReceiptPayload](#receiptpayload)>

Returns the optional receipt of a `MilestonePayloadEssence`.

### hash(): byte[]

Hashes the `MilestonePayloadEssence to be signed.`