{
  "manageEntity": {
    "action": "Save",
    "entityId": "540441965",
    "entityType": "Track",
    "nonce": "0x81cd96590a248ff9109322a3df2c522ca85f67b6ff6e146b38da3f0f459d84d5",
    "signature": "0x7b2276ebcca0e688a33f83f6dd9938e194e862af787a0132c10dd1c88db8fe927bc338e7a6817f274940a198ee933b10d99fca8758c46d66d14767f2531d3ccb1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}