{
  "manageEntity": {
    "action": "Save",
    "entityId": "1390639154",
    "entityType": "Track",
    "nonce": "1792370892112842587",
    "signature": "0xfa58e9280d41880f90adaadede09334a6c75b077cff31780f9129680cd4f00be2c1d84ea292668ec212c9cabf1e07d05ffeadf75a6fab5544ffb58eac0cd198c1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}