{
  "manageEntity": {
    "action": "Save",
    "entityId": "378609499",
    "entityType": "Track",
    "nonce": "0x54c6122fc76b1d1f7c85007eae320107344cfec6a38c20126d29b068f87dfaa8",
    "signature": "0xaa36e1288f3a3df62f4e4c092171a1635df263fdbf55c41e07d5eff20c5e385b1f90e9ef525f1a47dcfb30f2c42eb3d0c4599ca5f673edad75cf34805d3412fb1b",
    "signer": "0x6802Fe39C5FA9f99ac1Aa32F164982185A3E70ea",
    "userId": "152482938"
  }
}