{
  "manageEntity": {
    "action": "Save",
    "entityId": "1818369117",
    "entityType": "Track",
    "nonce": "0x0b3a5dbb2e49e8a4b4c7b673d052b7cf5795317b80c8ca37b6a990da066df53f",
    "signature": "0x5271b212e2b60f28bb3aaf1f13b5fc6306e02f49d6a6b6f043118d6aacc4923807d85878b24ebb1046e1fd08c399e369eb42dfe924a3a9744a5aa3782399b4081b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}