{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb21322e70cbd10fa2027ebfa5d5d27322c8f968c272bf7eacc0dce391e9c47f4",
    "signature": "0x21295b1a135e4dc91106ace1bbfb34e191d9fe224209be5ba800ef4f5447d7a832767b352ba54988482a2cf8971dd1b061ff9065e3cbd7cb7080471ea0d433ec1b",
    "signer": "0x2F9864d7d33e6411cF49b5E7d1D73C2A5e0A289F",
    "userId": "549774400"
  }
}