{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9695cd0d60bf0b31c320de2304092c01a2360dadbdb37ac0c7bec6b95845e091",
    "signature": "0x1cf5d929cc074a8b69586df3a1abbad0733aafd4a0e2c075338ccad2afcd231234de74218586174b4ed74e6b7703392c277f6b1b6cf86ef164c265aa27b641261b",
    "signer": "0xc31f9899FEF55e657f6ED15531e6005A4550B476",
    "userId": "750516953"
  }
}