{
  "manageEntity": {
    "action": "Save",
    "entityId": "380247",
    "entityType": "Track",
    "nonce": "0x897250cffab1492e533a6f7bf7281e8c259e3832a3165cd2d06b684798865855",
    "signature": "0x494bd7e4f6094088fbb8a5865ce24415d5c589776e42bf7d030a2d1ee6d3a4e80b460556ba159a5781394b01b540d6623350c2a05253c37c22c8a7b2d928f1541b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}