{
  "manageEntity": {
    "action": "Save",
    "entityId": "1375273447",
    "entityType": "Track",
    "nonce": "0xaf597a1cd4d995f710f8369744210e2a20ec1d90ca0264720d19391afe59c13f",
    "signature": "0x707a3bbe88317b62f5c5671e973b26208306e998e208a1d5e9b17fffdcc81daa2b700ca510167bfa767d36d5151b95a0d8a201f07ff254060fec2a9dac6bca261c",
    "signer": "0x34Cea527C1dc0575a5B686515aad0Bf8F3b5f97E",
    "userId": "13589021"
  }
}