{
  "manageEntity": {
    "action": "Save",
    "entityId": "722559599",
    "entityType": "Track",
    "nonce": "0x1e6e050e0399e868b456e5f3a2730a0edb60f698f3607162afcaa4ce2df0aa7e",
    "signature": "0xe29871d0e3c2414a3ba1c2ca0275f049656c721ecc9f73bf3e6fa7008d4558d67e77b3ec710bd7382a2737d949d6565a2b1d9dd2ccb93e070b18cbe600a826091b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}