{
  "manageEntity": {
    "action": "Save",
    "entityId": "1893935159",
    "entityType": "Track",
    "nonce": "0x406feb857c646abf3f958c8a0d8d889c1fb1a75f92409d14fb928b5db952f3b9",
    "signature": "0x65170867b1d4535f434429c953c85c10b3d50f26cb3b30dcce0074461b90a8a30b78ffd502aa97f537dc8b823e813b76e1237ba4ecd2ecacc45e8dc14e7aa6741b",
    "signer": "0x4089d1751487aA665C895419F2578a6Cf33BE481",
    "userId": "728155533"
  }
}