Skip to content
  • Home Home Home, current page.
  • Moments Moments Moments, current page.

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
hugohanoi's profile
Hugo Nguyen
Hugo Nguyen
Hugo Nguyen
@hugohanoi

Tweets

Hugo Nguyen

@hugohanoi

I chain, therefore I am ⛓️

Joined April 2012

Tweets

  • © 2018 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hugohanoi @hrdng and

      2/ That’s kinda like Antpool mining empty blocks, but doing it more consistently & on a much larger scale. If mining cartel can truly do this we have a bigger problem than fees: the miners have completely taken over the network & can impose artificial block limit on the users.

      1 reply 0 retweets 0 likes
    2. Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hugohanoi @hrdng and

      3/ 51 single-transaction blocks out of 100 means that the total available block space would be effectively cut in half.

      1 reply 0 retweets 0 likes
    3. Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hugohanoi @hrdng and

      4/ But the kicker is that the benefits of this manipulation (which again costs a lot of money) would go directly to the your mining competitors.

      1 reply 0 retweets 0 likes
    4. Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hugohanoi @hrdng and

      5/ Since the other 49 blocks would be mined by other miners, not you. You’ll be spending a lot of money just to line your competitors’s pockets and weaken your own cartel. Makes no sense.

      1 reply 0 retweets 0 likes
    5. Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hugohanoi @hrdng and

      6/ This attack, if carried out, can also be easily spotted on the blockchain.

      1 reply 0 retweets 0 likes
    6. Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hugohanoi @hrdng and

      Hugo Nguyen Retweeted Charlie Lee [LTC ⚡]

      7/ It also can be easily mitigated, as Charlie has pointed out, as long as SPV clients don’t use the same rule for estimating fee. Min feerate is only a fee signal, it’s up to each SPV client how to interpret it.https://twitter.com/SatoshiLite/status/949802676056834048 …

      Hugo Nguyen added,

      Charlie Lee [LTC ⚡]Verified account @SatoshiLite
      Replying to @hrdng @jimmysong
      But you are assuming every SPV client follows the same rule. That would be silly as it becomes easily exploited as you are showing. I would guess some SPV clients use last 200 blocks, some use last 1000, and some use last 100 but fallback to 1000 if fees seem high, etc.
      1 reply 0 retweets 0 likes
    7. Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hugohanoi @hrdng and

      8/ In conclusion, I think this attack is unrealistic, easily spotted, and easily mitigated against.

      1 reply 0 retweets 0 likes
    8. David A. Harding‏ @hrdng Jan 7
      Replying to @hugohanoi @SatoshiLite @jimmysong

      I think it's unlikely, but not unrealistic. My main point was that I think the risk of this attack, or more clever variants, means that SPV clients would be better off using existing semi-centralized fee estimation services rather than the miner-curated minimum block fee info.

      1 reply 0 retweets 0 likes
    9. Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hrdng @SatoshiLite @jimmysong

      I would argue that it’s easier to manipulate these centralized fee estimation services than to manipulate min feerate consistently over X blocks- where X is a large number :-)

      1 reply 0 retweets 0 likes
    10. Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hugohanoi @hrdng and

      Btw, there is no reason SPV fee estimation can’t get smarter. “Median over X blocks” is just the naive algorithm. Charlie already mentioned another one like having a fallback.

      1 reply 0 retweets 0 likes
      Hugo Nguyen‏ @hugohanoi Jan 7
      Replying to @hugohanoi @hrdng and

      If you want to get fancy, you can do anomaly detection / cluster analysis over a large distribution of min feerates. Given enough blocks, this kind of analysis should produce a fee estimate not too far off from a full node’s estimate.

      11:26 PM - 7 Jan 2018
      • 1 Retweet
      • 7 Likes
      • Travis Hawk Aying Torres Jax Carter ecurrencyhodler ®🌵dአ🦉🔱℘™ Know Em Chompsky Charlie Lee [LTC⚡] Hugo Nguyen
      0 replies 1 retweet 7 likes

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2018 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info