{
  "manageEntity": {
    "action": "Save",
    "entityId": "609215139",
    "entityType": "Track",
    "nonce": "0xaf73680f3d4f1cd023ff46803fb48fa385e1941c3879fdfe0c7c4340f30aae96",
    "signature": "0xb189c9fdb4cb0629e902a6565e9aa1c7d2bdb5d15e45c125d990b6d34db78bab5ac04c859dfd04e0a383dc55cd0e80c346e25d23a4d042183e57d91984c73ce41c",
    "signer": "0xbf1f8021D15fDffe83FE44dA0b0c9CE22371359e",
    "userId": "276678878"
  }
}