{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2a2b7a7606494f9a0c8daddcde33325841e576392b64dfb44cdcdb96ff1d1f04",
    "signature": "0xa7756b61c6e47d82a88937b6f37a690ea99841200dc73c910ff79f4bd7f5e2d526c547b38b6817466e7fd06298e4a7519b047df20d224357566ee831c135ca9d1c",
    "signer": "0x277E8d66acDc026c60d66fFE6865811A4fEf8274",
    "userId": "5453715"
  }
}