{
  "manageEntity": {
    "action": "Save",
    "entityId": "1550296584",
    "entityType": "Track",
    "nonce": "0x6ef71bd9a071ade6e4f319dbb497e37a33c35c96ffc34e3d779143f554ad0df1",
    "signature": "0xd4004dffffceec4c75cea8923501d593783c26a6185014a2b60e441c6ccbc68179cfc393cfa647482207d9f83519a1c9e23c65e67603b9ae4e9219147e8125a41c",
    "signer": "0x97EfdE0F439686416d7DF002501186b496E57640",
    "userId": "238431218"
  }
}