{
  "manageEntity": {
    "action": "Save",
    "entityId": "57727901",
    "entityType": "Track",
    "nonce": "0x2734305d690a086ad66dda8e09c85cd1becaf00b760a174a0ee132fac0d7a8a0",
    "signature": "0x3d1ca9c3308e87fac4ad778961a1ee715fdf60f1e6080802452b87b47958f2e67104a43991153e3b76fc4ef5d97ce37c5239607b774281568d98944be2280f3f1c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}