{
  "manageEntity": {
    "action": "Save",
    "entityId": "1526221591",
    "entityType": "Track",
    "nonce": "0xf7a709360d66da72c619d7ce2ed64539aa817e813592e4592a5e9ab62e210b34",
    "signature": "0x1b14e63e2b205d18ed21be8780754481cdfcd39db4f3db4bb5b3900a9983b9b74dbf5ab484643a0d21dc5322a2e5bd9a4084d06a6b2dc5a0ce1154fca5250c971c",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}