{
  "manageEntity": {
    "action": "Save",
    "entityId": "1142975902",
    "entityType": "Track",
    "nonce": "0xad21dd0a7e4c31257f912d64ff645a6a481102ab5606df1d3059c6835eb9e429",
    "signature": "0x8a8763def803527acf844c34ab108a0cf28003c679c90e9a697fe9f1b9c0001037aaa37c716d5fe61eba9af787a61d03d1c6060b7269954bcbf1c1cc8455e3101b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}