{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5f530133b9299564d1ecee380b9e317353dd4f218a93776b07ddfecf18c7c2e5",
    "signature": "0xd2473ef8f644d4c445c9754ee534a1179bdb70f1d1defcf5cbf682ff131c1e31239ac4bbb4aea5953bc535f115bc779c265e09b960f99bf860a0ee79876be4d31c",
    "signer": "0x2C81B4feC34484F38A9D770494d7D51184A5b1bB",
    "userId": "780483387"
  }
}