{
  "manageEntity": {
    "action": "Save",
    "entityId": "1405947878",
    "entityType": "Track",
    "nonce": "0xf1c355fa48ebfd51510e36360aefb3fe8c0bcec270025da3f55216f74f892d6f",
    "signature": "0xfdd444195d6c0776a7c390823ac1b4f70d01c524b97ff30bca6c1b4cc0b667437c97275ef70790fe2cfc87816b5aab7088582d329cfa7f5bd27f83a2070cb5091b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}