{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9c9c06a10a62cc9a4790fa2ce00dfc22e5b6e8c88e026c9ec246f3d836cffef5",
    "signature": "0xeafc749912e1f68fa780bd788acafcebb4ae98d5dd56d028b395d8585a84df740b9ba6195d01105115e979f5f6b784e4a45f64e6c659f3ca5c5f234dd9cc88351b",
    "signer": "0x7E3517dfB0133A2d80F1b5ef5A8956Fc415A8D5B",
    "userId": "411758839"
  }
}