{
  "manageEntity": {
    "action": "Save",
    "entityId": "449928615",
    "entityType": "Track",
    "nonce": "0xca486b48e4975d4ed9219630df428a6b6cca2834a10f91ae81fc430d0eda11a8",
    "signature": "0x814df85353585fe94bec94ec81d345a4a1f70f51d0d2fc04b8590ee62c38c1c439e302204eebbbeb45a89dee32d05135ee21a70eb581879eb2a577626a0992b11c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}