{
  "manageEntity": {
    "action": "Save",
    "entityId": "1243331757",
    "entityType": "Track",
    "nonce": "0x7df0af8c9c92a62f316da16eca61dfc81cf3e75b591368340f23f44a0fd3a743",
    "signature": "0xd76839f446d7933db2ce1cb702ee780cab74bf60f9904b9e964b3c5a734dfede2e1460a9017222db5230267b37ecabc721ff83a2c4fedbbb92a49bca0c9336b51b",
    "signer": "0x4C3319Ed2A4eE4e391d83e39b9e526Df4659cAbF",
    "userId": "517105107"
  }
}