{
  "manageEntity": {
    "action": "Save",
    "entityId": "819850548",
    "entityType": "Track",
    "nonce": "0x034da411290894274fb87fb8851c22299a4a4b565bb1531a6aa85f0443d410b3",
    "signature": "0x01e93f1a5003b2195dc83c19690527991da49688d99b2e85222f2aeecc035e497fb1402684d5a209957933e5195b15d9ea3757f6a682ccafc6487d8edc94e90b1b",
    "signer": "0x1F9dC682fadBAc94c0Dd4ca2232a3f490704a737",
    "userId": "737872723"
  }
}