{
  "manageEntity": {
    "action": "Save",
    "entityId": "1937521353",
    "entityType": "Track",
    "nonce": "0x891036916a3934d7ad1d33821dd713da16416a9b44dbc5a0af66c0d15d59b31b",
    "signature": "0x31958bb2234ed35f3c35c3dd453e08ed8111904341117d038785df71ec57d1036f6f867379ffa741d068793465771cba1779e767495474520690cf45a3b403db1b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}