{
  "manageEntity": {
    "action": "Save",
    "entityId": "498038287",
    "entityType": "Track",
    "nonce": "0x7437220f34fd10fddf58c68c0e797f67c061cb46f9a49f5ca305f72042ca0ab5",
    "signature": "0x62579c2557d345e4d2d28e38568cfff9d1836f3d19d2e6332ab5e8276660a08a32e8f9b7cbce19acb3c35112a204ea9d076113724088ad81b1c0d705038041001c",
    "signer": "0xBA2d779983D6bf434D3CcAd9C1bF495735d1BA8E",
    "userId": "28393"
  }
}