{
  "manageEntity": {
    "action": "Save",
    "entityId": "761308786",
    "entityType": "Track",
    "nonce": "0x976e43021f6dfd9b82e5a3ec8bbfd01635eed469a2bf6d2a010a5954194e7da1",
    "signature": "0xb77251b672495c170e061d81de4ac703a12a4ac1452ed693339841069130b817476cd64245a8e6433943cac17e63e01b693075fb43ef6df4d3e5201085b4fdc81c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}