{
  "manageEntity": {
    "action": "Save",
    "entityId": "1544699379",
    "entityType": "Track",
    "nonce": "0x7451417226db6e580c2f7cc6745c15d381f2796b2b42335e311dae4b53cf5fab",
    "signature": "0xc3e7f37ab2f2aadee293e1116d974a98d4161ec97d20971635c8032c41bb7d7c747eed7669d97e4b439c94dcf1d556571b99978f1c6ae6c91edc6a01c478a1821c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}