{
  "manageEntity": {
    "action": "Save",
    "entityId": "990168244",
    "entityType": "Track",
    "nonce": "0x4732049de2b3d0e2f34aafeb567dfc78d548328bfbb2e79e55fcb23953bb345c",
    "signature": "0xbc51024d6b4420af0d8f8f438a3c5fe41af0e02ed60939d39a042c34afc9ca1636d9817808b79d0a53c219f85283a5508eb17f8779d5182faeda32ad904f20011b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}