{
  "manageEntity": {
    "action": "Save",
    "entityId": "552235736",
    "entityType": "Track",
    "nonce": "0x4eb5dbb64ca62dacb2582ef2d9e006b603472ae566a4279e9ff7c2392833a2ec",
    "signature": "0xcfb80d325a2d7911bfbb411595462e75b8c484a5965bb131c8c2d5dfe0e715031477b37a159c3eb6014072aeb1080ca7bd3c18a337a07f5187c297ffb6fa47101b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}