{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557436008",
    "entityType": "Track",
    "nonce": "0x7dbabf36ffb705b32d507f7a05491ea9ac1a5c0734ac2aa72918da4b039998bf",
    "signature": "0xa88b8456a1d8539abc7480e05856606d9aefa0e7bc216b3954871fc30eca5d923aa3ddb64c1742dba1d4a935a872dc054347c6c1fe2df3c4874859b382cacef21b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}