{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x88b174a3c658652d44c0d871b49a4abf3439e6d4127cdf6cc9313a9cf7152f8b",
    "signature": "0xdd3f400358f6960566140c8516dca8e2e55a824d83a4421431ded67c32c8f94d0b0d6cf217ab6ab5ed020968f97af6a4a12eb7dece934051e0c0f19654e0e2861b",
    "signer": "0xE8138E527B59Ab8BfE8a7FA47FF916b52B4dE327",
    "userId": "415404216"
  }
}