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Any luck with winning at least NT$200 this time? A total of four uniform invoices issued in July and August had the winning serial number drawn Saturday in the bimonthly lottery draw for the top prize of NT$10 million (US$359,912).
https://focustaiwan.tw/business/202109260007
📜 [專欄新文章] Gas Efficient Card Drawing in Solidity
✍️ Ping Chen
📥 歡迎投稿： https://medium.com/taipei-ethereum-meetup #徵技術分享文 #使用心得 #教學文 #medium
Assign random numbers as the index of newly minted NFTs
Scenario
The fun of generative art NFT projects depends on randomness. The industry standard is “blind box”, where both the images’ serial number and the NFTs’ index are predetermined but will be shifted randomly when the selling period ends. (They call it “reveal”) This approach effectively solves the randomness issue. However, it also requires buyers to wait until the campaign terminates. What if buyers want to know the exact card right away? We’ll need a reliable onchain card drawing solution.
The creator of Astrogator🐊 isn’t a fan of blind boxes; instead, it thinks unpacking cards right after purchase is more interesting.
Spec
When initializing this NFT contract, the creator will determine the total supply of it. And there will be an iterable function that is randomly picking a number from the remaining pool. The number must be in range and must not collide with any existing ones.
Our top priority is accessibility/gas efficiency. Given that gas cost on Ethereum is damn high nowadays, we need an elegant algorithm to control gas expanse at an acceptable range.
Achieving robust randomness isn’t the primary goal here. We assume there’s no strong financial incentive to cheat, so the RNG isn’t specified. Implementers can bring their own source of randomness that they think is good enough.
Implementation
Overview
The implementation is pretty short and straightforward. Imagine there’s an array that contains all remaining(unsold) cards. When drawIndex() is called, it generates a (uniform) random seed to draw a card from the array, shortens the array, and returns the selected card.
Algorithm
Drawing X cards from a deck with the same X amount of cards is equal to shuffling the deck and dealing them sequentially. It’s not a surprise that our algorithm is similar to random shuffling, and the only difference is turning that classic algo into an interactive version.
A typical random shuffle looks like this: for an array with N elements, you randomly pick a number i in (0,N), swap array[0] and array[i], then choose another number i in (1,N), swap array[1] and array[i], and so on. Eventually, you’ll get a mathematically random array in O(N) time.
So, the concept of our random card dealing is the same. When a user mints a new card, the smart contract picks a number in the array as NFT index, then grabs a number from the tail to fill the vacancy, in order to keep the array continuous.
Tweak
Furthermore, as long as the space of the NFT index is known, we don’t need to declare/initialize an array(which is super gas-intensive). Instead, assume there’s such an array that the n-th element is n, we don’t actually initialize it (so it is an array only contains “0”) until the rule is broken.
For the convenience of explanation, let’s call that mapping cache. If cache[i] is empty, it should be interpreted as i instead of 0. On the other hand, when a number is chosen and used, we’ll need to fill it up with another unused number. An intuitive method is to pick a number from the end of the array, since the length of the array is going to decrease by 1.
By doing so, the gas cost in the worst-case scenario is bound to be constant.
Performance and limitation
Comparing with the normal ascending index NFT minting, our random NFT implementation requires two extra SSTORE and one extra SLOAD, which cost 12600 ~ 27600 (5000+20000+2600) excess gas per token minted.
Theoretically, any instantly generated onchain random number is vulnerable. We can restrict contract interaction to mitigate risk. The mitigation is far from perfect, but it is the tradeoff that we have to accept.
ping.eth
Gas Efficient Card Drawing in Solidity was originally published in Taipei Ethereum Meetup on Medium, where people are continuing the conversation by highlighting and responding to this story.
👏 歡迎轉載分享鼓掌
Let's celebrate International Coffee month with NESCAFÉ®. During this coffee month, NESCAFÉ® rewarding their loyal customers with amazing prizes. “Peraduan NESCAFÉ® – Vibe Kopi” WhatsApp contest, offering 324 prizes worth a total of RM290,000.00 to be won, including 18 x Honda Vario 150 Repsol! The contest will be held from 6 September – 7 November 2021.
Here is how to participate:
Step 1 : Purchase a minimum of RM6 worth of any participating NESCAFÉ® Can/Bottle/Cup products in a single original receipt from any participating outlets (in-store or online).
Step 2 : Write your full name and identification number on the front of the receipt and submit a CLEAR picture of the receipt and total amount to the WhatsApp number: 018-388 0070. The contest participation is accepted via WhatsApp only.
More information check out @Nestle.Malaysia
#NESCAFEVibeKopi #NESCAFECans #readytodrink #coffee @inkpr.my
Tallest toilet paper tower in 30 seconds
↑記録のタイトルです！
二代目のチャンネルもよろしく！
☆Fischer's-セカンダリ-
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☆チャンネル登録よろしくね！
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☆専用の絵文字や限定動画など色々！チャンネルメンバーシップご登録はこちら！
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－メンバーシップ向けの再生リストはこちら
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☆Ｔシャツ、パーカーなどのフィッシャーズグッズ！
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☆フィッシャーズメンバーのTwitterはこちら！
ーシルクロード@RytoSle2（リーダー）
■https://twitter.com/RytoSle2
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■https://twitter.com/MASAI_Fischers
ーンダホ@ndahoFischers
■https://twitter.com/ndahoFischers
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■https://twitter.com/fischerszakao
ーダーマ@M2DAMA
■https://twitter.com/M2DAMA
↓フィッシャーズ公式アカウントは下へ↓
☆おすすめ動画はこちら！
①【不可避】絶対に食らってしまうパウダーペットボトルチャレンジが面白すぎたwww
https://youtu.be/Wkxzn58b9dU
②【大食い】コストコの約4kg巨大ケーキを食べた結果…を想像できる？
https://youtu.be/WmBovt45R3w
【Fischer's-フィッシャーズ-】
出来そうで出来なさそう、くだらない事、好きなことをする…。
中学三年の頃、「楽しい」を動画にすることから始まった古くて幼稚園、同い年の同級生からなるネットパフォーマー集団です。メンバーは全員で6人！
[シルクロード] [ンダホ] [ダーマ] [ザカオ] [モトキ] [マサイ]
【公式アカウント】
ーTwitter（動画公開時の通知＋告知など）
■https://twitter.com/FischersHome
ーFacebook（動画公開時の通知）
■https://www.facebook.com/FischersHome
ーInstagram（オフショット）
■https://www.instagram.com/fischershome
ーウェブサイト・メンバー紹介
■http://fischers.web.fc2.com/
【再生リスト】
―すべて表示(西暦別もあります)
■https://goo.gl/fB9HYY
―アップロード順
■https://goo.gl/TuFZ4W
―再生数順
■https://goo.gl/pw3hyy
【音源・効果音使用元】様
―DOVA-SYNDROME
■http://dova-s.jp/
―効果音ラボ
■http://soundeffect-lab.info/
―甘茶の音楽工房
■http://amachamusic.chagasi.com/
―魔王魂
■http://maoudamashii.jokersounds.com/
―Epidemic Sound
■ http://www.epidemicsound.com
【一部の動画・静止画素材提供元】
PIXTA
※動画によって使用していない場合がございます。
【お問い合わせ先について】
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【サービスに関するお問い合わせ（UUUM）】
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#Fischers #フィッシャーズ #ギネス世界記録
お弁当の定番おかず…「から揚げ」！『から好し』の唐揚げ弁当をテイクアウトしてみました！「から好し」はガストやジョナサン、バーミヤンなどを運営する「すかいらーくグループ」が新たに手がけた唐揚げ専門のお店です。2017年、埼玉に1号店がオープンしました。から好し店舗は90店舗ですが、併設ガストを合わせると600店舗を超えるそう！今回もガストでテイクアウトできました。からあげは、古くは江戸時代から作られてきた説もあるくらい昔から日本で親しまれてきた調理方法です。肉に衣をつけて油で揚げるというシンプルなレシピですが、その味はもはや子どもから大人まで親しまれる日本のソウルフード！から好し初体験、早速ご覧ください！
＊感染対策を徹底して撮影を行っています。
＊撮影に際しては、お店の方や周りのお客様に充分配慮して撮影をおこなっています。
A classic side dish for bento ... "Karaage"! I took out the fried chicken lunch box from "Karayoshi"! "Karayoshi" is a restaurant specializing in fried chicken newly created by the "Skylark Group" that operates Gust, Jonathan, Bamiyan, etc. In 2017, the first store opened in Saitama. There are 90 favorite stores, but it seems that the total number of stores will exceed 600! I was able to take out with gust this time as well. Karaage is a cooking method that has been popular in Japan for a long time, as there is a theory that it was made from the Edo period. It's a simple recipe of battering meat and frying it in oil, but the taste is Japanese soul food that is loved by children and adults alike! Please have a look at your first experience!
* We take thorough measures
against infection.*When shooting, we give due consideration to the shop and customers around us.
いつもありがとうございます！( ´ ▽ ` )
高評価＆チャンネル登録もよろしくお願いいたします！
#から揚げ #から好し #肉 #ロイドごはん #フラメンコロイド
—————《姉妹チャンネル》—————
【姉妹チャンネルもよろしくお願いします！】
メロンシートジャーニー
https://www.youtube.com/channel/UCwNlBAUziFWkJZFY_u3t65A
フラメンコロイド
https://www.youtube.com/channel/UCsFJHNg3SR41R2a3vctUInw
🍀「ロイドごはん」公式LINE
https://lin.ee/ow4OdaV
—————《本日の店舗情報》—————————————————
『から好し』
https://www.skylark.co.jp/karayoshi/
—————《ロイドごはんのおすすめ動画 ROIDGOHANs’ Recommended video》———————————
超デカ盛り【上州屋】唐揚げと爆盛りライスで大食い！
https://youtu.be/RlxlPP92kWc
78才おじいちゃん屋台ラーメンの朝『幸っちゃん』夜明けの銀座 【飯テロ】Old Style Ramen yatai Japanese Street Food
https://youtu.be/YHiWYvhxUI4
神回【ラーメン二郎の貴重映像】全増しが出来るまで一部始終を大公開！【ラーメン二郎 ひばりヶ丘店】ramen
https://youtu.be/mBFcdMHyaxA
—————《twitter》—————————————————————
★ロイドごはん
https://twitter.com/roidgohan
★メロンシート
https://twitter.com/meloncito310
★フラメンコロイド
https://twitter.com/flamenkoroid
—————《instagram》———————————————————-
★ロイドごはん
https://www.instagram.com/roidgohan
★メロンシート
https://www.instagram.com/satoshimelo...
★フラメンコロイド
https://www.instagram.com/flamenkoroid
—————《各サイトの情報》—————————————————
★ロイドwalker《人生をドラマチックに彩る旅とグルメと温泉図鑑》
https://ramenjapan.net/
★メロンシート《フラメンコギターの世界一の旅》
https://pordiotama3.xsrv.jp
★フラメンコロイド 《フラメンコロイドの神話と伝説》
https://flamenkoroid.net
For this episode, we headed back to Neo’s Kitchen to attempt a LEVEL 99 SPICY MALA WONTON CHALLENGE! EB Food is organising a timed wonton challenge with the launch of their new product, EB Shrimp Wonton with Mala Sauce. Eating the greatest number of EB wontons in 5 minutes will net you a cash prize of $2000, with further cash prizes for 2nd and 3rd place. Full details listed below:
The EB Shrimp Wonton with Mala Sauce came neatly packed in a pleasantly-enough designed box that really undersold the potency of the Mala sauce. They were simple to cook - boil the 12 wontons for 5 minutes, warm up the Mala sauce in hot water and mix them all together. The Mala sauce was a menacing shade of red glistening with Mala oil radiating that signature Mala aroma. The wontons themselves respectably plumped up considerably during cooking. Each had a whole shrimp in them. When mixed together, each wonton ended up adopting an even shade of red with small clumps of Mala sauce noticeable throughout.
I attempted this challenge with Mervin (there is a buddy requirement). From the number of wontons we prepared versus the number consumed, it was clear that we underestimated this challenge. We thought it would be a speed challenge, but it ended up being a spice challenge due to our low spice tolerance and the unexpected heat of the Mala sauce. Out of the 100+ wontons we cooked, we only ate 48 between us within the 5 minutes limit.
Note that our attempt does not count for the official challenge, so please do find a buddy (preferably someone who loves Mala) and win yourself $2000! The wontons are also Halal, so Muslim viewers can join as well!
Follow these easy steps to qualify for the challenge:
1. Like and follow @ebfood.sg on both their Facebook and Instagram accounts
2. Complete the T&C Google form before joining the challenge: https://forms.gle/phDZn6q3RZ77gaYS6
3. Film and upload your challenge video on both your Instagram accounts:
- Tag @ebfood.sg and your buddy's account
- Hashtag #EBFrozenFood #BeatMAloveforLA #malasg
- Indicate the total amount of Mala Wonton consumed
- Set both accounts public
4. Send the original video with 5 minutes duration to: marketing@ebfood.sg
*Your full video should include the process of pouring and mixing all the Mala sauce given in the packaging.*
Cash Prizes:
1st Prize: $2000
2nd Prize: $1000
3rd Prize: $500
Winners will be contacted by email on 23 June 2021.
Reminder: In order to qualify for the challenge, do read through all T&Cs and rules carefully from the Google form.
Connect with us!
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Use code ZERMATT for 58% off ALL Myprotein products.
For those that are interested in doing ZenyumClear™️ Aligners:
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Use code ZERMATT100 for special discount!
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