{
  "manageEntity": {
    "action": "Save",
    "entityId": "1556967835",
    "entityType": "Track",
    "nonce": "0xf9a5a48d899855aecab90baa71cd646161d59427c3b0e5ee7299a2bfb6db7c9d",
    "signature": "0x754f27d176fc813cca7bbeb83ac66a709227fd4c645a766f7e87d41c089b07a33a26b38f583bff5c362dcd7156c1b1936c8d2d4fc265045ae9a18fb35fc9f8611c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}