{
  "manageEntity": {
    "action": "Save",
    "entityId": "1503683375",
    "entityType": "Track",
    "nonce": "0x424b921f4969c316cb039058c3e22f96925fbe40a8d2fc08eb81510662002f94",
    "signature": "0x764ae29f0b500af09b29332ab764c454e55250b3adb70496e511806309f259f774d5ced27e1c2e09b22abe309d9f7d628211538e438840b6ddf474c6eb7f259d1c",
    "signer": "0xc03cf24b1C519dA6a18B6509c7F5C57d01620755",
    "userId": "870665506"
  }
}