{
  "manageEntity": {
    "action": "Save",
    "entityId": "146023003",
    "entityType": "Track",
    "nonce": "0xd22a32878e27845e3d89ce6627148437378b02d5656ddfa23fa13c11a7e40e96",
    "signature": "0xf5fa6d42801757a62c72275f8c8a05c1e9b3ab8815c4fbbdaa478067deeb37b044016043e33d560d2c126cc81ea731ae4a1631ae369598b92fe6cabd5e5c5cd11b",
    "signer": "0xB57F94Ef9a26d73E8b35D3f37FccD18BcC7eeE00",
    "userId": "850416615"
  }
}