{
  "manageEntity": {
    "action": "Save",
    "entityId": "472975",
    "entityType": "Track",
    "nonce": "0x489f0304403acaf519bbacb4c2868a3fe9aced48cc501633bee068171dadfa6a",
    "signature": "0xf77eca8ee360fdd48dd52374402e0eff37f028c2d63182a33f29f3370fc9c9db6ac24b4e6704c61c0ab071be54777bb6c5599258189a5a536f7f65b02552bba11c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}