{
  "manageEntity": {
    "action": "Save",
    "entityId": "520648967",
    "entityType": "Track",
    "nonce": "0x44ea116d7a831c92f6cb4cf9af4bf5aa8b560a8c2f1086be91f14b3cdb632e9a",
    "signature": "0x19cd68ddfa57c44182bebec30b440ce1ec0bff0d5b184589ecbd878f1563484330ee13438a27083928d191959cb1276d3cb8ae37f77a2f79dc77f9ce7cc126a51c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}