{
  "manageEntity": {
    "action": "Save",
    "entityId": "768762",
    "entityType": "Track",
    "nonce": "0xf4a90e12bd28a4a736d488f8755d8f691f248e1d7f1d271e5b3d209e071f93f5",
    "signature": "0x2f49b6f57dc4848e423a786f6e961510bd1199ae4dcbaa70c4d9dd3cedf8c9db18821ff399a062f5f491b53f1f79176772b5fd9804cad6ddc8574cb702d2425d1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}