{
  "manageEntity": {
    "action": "Save",
    "entityId": "545428",
    "entityType": "Track",
    "nonce": "0x4650ba7ad4e58bbf1524386995bf5b0379152957c229a6ac7e7a75baeacde122",
    "signature": "0x68e9a9e88ae532cb9bfa46ceb89d05bd158ab67a3795a719a40558be45f7d87d433aff33c26aed08dc06df22e27543ad5b8f973d65530e1237fb59aecb0b97921c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}