{
  "manageEntity": {
    "action": "Save",
    "entityId": "643297253",
    "entityType": "Track",
    "nonce": "0xac6866582d1fb77d0ad7706cfbe866d09731701594a9d61ef29c7a61f788d913",
    "signature": "0x8fdb1536827b075776cd147cfbf0c72f83a927f1b9b0e8179778e86e89942a3668dd919798ae89499f367c6679103babbe5030e69ef8025e3e280e2ec4e7b62d1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}