{
  "manageEntity": {
    "action": "Save",
    "entityId": "1521953743",
    "entityType": "Track",
    "nonce": "0x3faa459bcbf6621c7e9584168a178dc596430904727e4eb22f3b73b92f1a9b9a",
    "signature": "0xaa5e41a0c8de7041ea904937b0434d9e0f6bb8179a58cdab37e6602524acf4514b9ed118bcfc9885b036859a2aa2fe67a32b4704b10da115a9673488522329fb1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}