{
  "manageEntity": {
    "action": "Save",
    "entityId": "1469239040",
    "entityType": "Track",
    "nonce": "0x7b62622065fb4ce30b180adf95b16b0f9e5c91078617c44309cd57e3609369f7",
    "signature": "0xe8e55708e32f3f0a7e6d8a887533cdb623e7f61018cd9cbd2e7a6f83f4392d6153f78af218a9c94490ced67f9e6c88cb4a3b9b7b8ff6e3b73ed0110e0dcf06ca1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}