{
  "manageEntity": {
    "action": "Save",
    "entityId": "49834652",
    "entityType": "Track",
    "nonce": "0x2d2de224acd2ce80430008d00cb42f3462c2f659a2ea7a2aa88169e9565b2be6",
    "signature": "0xcfa9b0c38ffdd0e4933165815aaa28d3eab101b7e9b3504785e08a687e778b30222cf3941ef03ef00f242765b169441655eff2edd59529c5f93aa235205aaa261b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}