{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x42f5ee5f5595f940f497714be1629bf119932c52f9f8bfa2fbe9048ae75e9ab7",
    "signature": "0xaf613da302fd8f55fd634f8f5a0a02a54f87bea7efedc0cee98327da7f3f1b0c625ee640396dedb537f45ff0fda5cebd79b4871a228164ddebc7995887230a111c",
    "signer": "0x6558Fe4eB1189670c9F0dd0f345B8C6367e99F8a",
    "userId": "60753674"
  }
}