{
  "manageEntity": {
    "action": "Save",
    "entityId": "603039",
    "entityType": "Track",
    "nonce": "0x5979955472a50fa85edcff0e4d86dc5736dfb6bcc16921eacc3ce09df0d6893d",
    "signature": "0x9b09ace328ec6a27453bea55e70564156202fd989b480eb77b549adaa0fa743a5735933a27a9dede5cb47c99dc7bdee932fb2db4b39a03ce832a6d9fa1cc92351c",
    "signer": "0x2B28feb1CA15953a5a910C4E741698a24e8b3FE9",
    "userId": "887020893"
  }
}