{
  "manageEntity": {
    "action": "Save",
    "entityId": "323436999",
    "entityType": "Track",
    "nonce": "1792360859784684437",
    "signature": "0xaf7bb4d38fa6412ea134643e6fa494397336aac634f24d443690c38d301d1f6865526e7289ba9cfe75e514e2810df090aede2a8a6c3ae8afd44643020b376d441c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}