{
  "manageEntity": {
    "action": "Save",
    "entityId": "590020",
    "entityType": "Track",
    "nonce": "0xa38ba161a7069a2e829b5558902e4a89d8c1708529a5ee5459a0a425574f9d60",
    "signature": "0x4188e4d1380ed3d2420290edffd1045fda01afb4bd9f31694092969809488fab3b325ef477dfcdbd6fb386fb6a1d1d99142b584ab7a47ba50bfca7a08e71dc9a1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}