{
  "manageEntity": {
    "action": "Save",
    "entityId": "135122782",
    "entityType": "Track",
    "nonce": "0x1a5e5c9d8b1cc4ac87492d589532c48d823d22634cd16339a10319b96554a489",
    "signature": "0xcd75f29b2240131ef26db5efa3359fc1f7ea0b18b1fe71c736c94ec21b6303fe4c027406a41fd669974bf9c90bba9d6e3f560a74d768318f4a6a8b8c5cef8bc81b",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}