{
  "manageEntity": {
    "action": "Save",
    "entityId": "1396434967",
    "entityType": "Track",
    "nonce": "0xaf4396f090a077b12aa865430359b0ea259a37c6ea6ccec372b958f41fd6c335",
    "signature": "0xe519efc81a3249a8524e23a302fb8f61ad888d34b27139f3cdedc8dce01e890a722727903d4008a035a06ee6e505a5bc2e3025bf7c7b724c7da67067abeee1421c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}