{
  "manageEntity": {
    "action": "Save",
    "entityId": "348205496",
    "entityType": "Track",
    "nonce": "0x53877b1a2c762ea57845ae86f82de92c147a8d157f30acf605ff9b8fb1b6de10",
    "signature": "0xb13c64a9fe3d6fb49d4dfbbe8433acd8a306ab3bc9f09f5a5fb42f75b6cce3092c2b74cc38d21e738d9209fdf05a63f326c1670ef661b09cdfc079b1f85fc4b91c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}