{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xaf338a4d37daaef9fca8d0f613a69f45a3c2ccd6f9b8608730236421276614cb",
    "signature": "0x520f6f4bbc97e7911576579d38e1a41b9446734619d0e2c0b6239f92049c01a81e421c64fe65c7de254a353ca41fa6c8784bee11a3108e1b975e63d178d36d661b",
    "signer": "0x92f4032Ca1B6917614552f8Add356b45B30b75bF",
    "userId": "890891313"
  }
}