{
  "manageEntity": {
    "action": "Save",
    "entityId": "491320875",
    "entityType": "Track",
    "nonce": "0x6a48c26f8acf45df6760481fee51f6b4d60743af2241eed9f486701677c53052",
    "signature": "0x14bd243ce7ca9dfbf481720d11150e08e87e6c436a91a55a5753bae0998bb09a3bc2905439080700da41da2740341239586cb9ee0d01443d16b364c9811291191b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}