{
  "manageEntity": {
    "action": "Save",
    "entityId": "1512854567",
    "entityType": "Track",
    "nonce": "0x5f3987a8ab0493c1bc9ba77469b87fe64231d65902dcb47b6f8cfa2f387416df",
    "signature": "0xbc0578da650782b80aa7d4a6b21b397f72f2f88c33dfbe740c17c5e2d9ae66a4181fa690236d35756141a26f0c01079aa3b42f7fc75a69cee44f3a2f3cf7f8581b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}