{
  "manageEntity": {
    "action": "Save",
    "entityId": "562704238",
    "entityType": "Track",
    "nonce": "0xc686bf7fa51f8678609efc8a201f091978e30880bd2697e471557b47d8ec8e1f",
    "signature": "0x5a1223d31d170500b9f78e0d8fd0b85b62f90503be2404aceaae91a3a9e4a51718da2d37383051f3abc1a8efce86ad172594362cfb38e72548c772157265f83c1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}