{
  "manageEntity": {
    "action": "Save",
    "entityId": "648616916",
    "entityType": "Track",
    "nonce": "0x997c0862a1a76e04b35733e85a52ea472837dd4736621b20eb3c6a24c445721f",
    "signature": "0x4395bda384e8e151db9c513c87a900ccc69218ab3ed0dbef13cd405066459f904dea020eed30f9151aeb4cf632becb458c7447f9bd291e2399f1c95fc0a0c0871c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}