{
  "manageEntity": {
    "action": "Save",
    "entityId": "307768",
    "entityType": "Track",
    "nonce": "0xd92a23ba623d918362394d370408430b0c9a9183a86d8ee121ed2847b460eb97",
    "signature": "0xf89730a13b58e0e1175684b56f2aed3d3bbc60cc87cde7098aa33866398d658e1190698096e9ccfbf88fb956e67760025ee362c076cefbdfc8b3304afd5385d01c",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}