{
  "manageEntity": {
    "action": "Save",
    "entityId": "539126301",
    "entityType": "Track",
    "nonce": "0x50c2feedef36a28738b3df190105de9af25110fb2201c5f7af3a77b2c9e5a72b",
    "signature": "0xbb22bc5e04ffdf05e27ea61b7a9e9315a8d6f7cb13934a81b040c24d1f09e9e265fc05ebe728e14d825d568f8362c63119df94f693e5b9903bdf06bd9c19022c1c",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}