{
  "manageEntity": {
    "action": "Save",
    "entityId": "2015087819",
    "entityType": "Track",
    "nonce": "1785496444015575634",
    "signature": "0x1961796ae60100f84f7b95f60db5da2010a84348e4b1f8e176f801b08e4c372a3f6cae89381d746d0f124d1a832458b248c3a541ce1e4e5b044649cdead10cdc1b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}