{
  "manageEntity": {
    "action": "Save",
    "entityId": "999901879",
    "entityType": "Track",
    "nonce": "0x3d79aaf2b8cc11244086b7658be400ffc5b4ec2966792818cb921029937142a9",
    "signature": "0xacfd32789a70241e5415eb5db2e924c7757163332fe04f681d3fdfd9291706aa7e09b9b9f3a6c01dc3885f9b1b2861ad962fa7dcceeb4bf8e0264f3d5c4d46e11b",
    "signer": "0x65b2681094e762CAD2349e6C1e2FbC8d54b9c046",
    "userId": "11153747"
  }
}