{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf6c3a38fd9042863fca630b16c4fb6003ef82b8456db109ebd6e32f067713898",
    "signature": "0x8809ac27ddfb17919c884d66f4e983444de1459f6d9a1fad92f92743afa82ca87ddbf60a0943062bb8af518c0a812fd92c068d8f3a842822ebd3826d1ed0f4de1b",
    "signer": "0x54C4Ca69528DB72E771432D2Cd644208d9a3C9de",
    "userId": "490408969"
  }
}