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同時也有148部Youtube影片,追蹤數超過3萬的網紅睿富財經頻道WealtHub Channel,也在其Youtube影片中提到,人算天算不如機算,運用「程式交易」對投資者有何好處?又如何應用至虛擬貨幣投資上?今集《#致富解碼》香港程式交易研究中心聯合創辦人 #蔡嘉民(Calvin)向你一一講解,並分析虛擬貨幣及大市表現走勢,資訊非常豐富,去片! 【第36集主題:#程式交易】 主持:天窗文化集團 CEO #李偉榮、...
algo 在 Taipei Ethereum Meetup Facebook 的最讚貼文
📜 [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
algo 在 細貓 應智越 FanPage Facebook 的精選貼文
應智越 (細貓) -《Ophiuchus》| Official MV | Ying Chi Yuet (MrLittleCat) - ⛎
已於各大音樂平台上架:
https://lnkfi.re/YP_Ophiuchus
Official MV in Ying Production YouTube Channel
十二星座、十二生肖、九型人格、十個靈數、兩種性別、三個世代、四種膚色⋯⋯ 千千萬萬個把人分類的方法,但為何我要安於框框?
我可以是獨角的山羊,可以是會飛的人馬,可以是帶刺的獅子,我更可以是那個神秘莫測的第13星座蛇夫座 - 橫空誕生,擾亂原有的秩序,改變本身的軌跡。但當然,我也可以不是蛇夫。我可以是更多。
“The Ophiuchus is not a new constellation altogether but a rather forgotten one.”
.
Composer : Dong
Lyricist : 奧仕卡 @oscarlee
Arranger : Dong
Producer : T-ma @tma68
Backing Vocals by Walter Kwan
Editing by T-Ma, Kelvin Au, John Benedict Pereira
Mixed by John Benedict Pereira
OP : Ying Production Limited &
土方製作 admin by Music Nation Publishing Co Ltd.
Artiste Management : Michelle Sn & Elaine B
MV Director : Faith Ma & Tin Tin po @Sightless Vision
Dance Choreographer : Fat Boy
Dancers : Algo Au, Danffas Au, Mo Li, Woody Kwong
Production Manager : Pik Yi
Production Team : Jojo Tse, Mag Lam
Director of Photography : Faith Ma @Sightless Vision
Second Unit Cinematographer : Ho Shun, Kuen Chung
Assistant of Camera : SonJ Ng
Make-up Artist ( MrLittleCat ) : Lulu Lee @I Lu Mine Makeup
Hair Stylist ( MrLittleCat ) : @lupus_c_hair C @O4 Orient4 - The Official Page
Make-up Artist ( Dancers ) : Anges Yeung
Hair Stylist ( Dancers ) : Tim Chan
Poster Photography : Nicky Jai @nickyjai
Art Director & Styling Design : Maisy Ho
Assistant Art Director : Yu Kwan Yee
Editor & Colorist : Faith Ma
Special Thanks
Animal Director : Annie Tse Yuk Wa
Title Design : Kizz Lau
#Ophiuchus #Ophiuchus⛎ #⛎
#蛇夫座 #十三星座 #被遺忘的星座 #13星座 #不受框條規限 #活出真我
#12星座 #十二星座
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#跳唱
#yingproduction
#應智越 #細貓 #yingchiyuet #mrlittlecat
algo 在 睿富財經頻道WealtHub Channel Youtube 的最佳貼文
人算天算不如機算,運用「程式交易」對投資者有何好處?又如何應用至虛擬貨幣投資上?今集《#致富解碼》香港程式交易研究中心聯合創辦人 #蔡嘉民(Calvin)向你一一講解,並分析虛擬貨幣及大市表現走勢,資訊非常豐富,去片!
【第36集主題:#程式交易】
主持:天窗文化集團 CEO #李偉榮、資深 iBanker #蕭少滔
業界嘉賓:香港程式交易研究中心聯合創辦人 蔡嘉民(Calvin)
➤ 【投資Hotspot】與你捕捉環球及香港市場投資先機 00:00
➤ 【致富解碼】 邀請業界人才暢談財經金融,深入淺出與你配置Smart Money 03:43
04:06 2021年上半年美國及香港市場事故多,是否與程式交易(Algo Trade)有關?
07:44 程式交易上季風險管理的表現是否比人手交易好?
09:40 程式交易有何優勢?
12:35 虛擬貨幣哪種程式買賣設定較安全?
17:22 如何分配AI程式交易及直覺投資的比例?
21:39 港股現時是否擺脫頹勢?
25:50 美股現況有何分析?
26:39 三大指數創新高,美國股市第二、三季有何表現?
29:00 如何配置虛擬貨幣?
31:00 預計Bitcoin走勢如何?
36:25 如何挑選值得投資的虛擬貨幣?
======================================================
【書籍推介】
《程式交易快穩準》 (蔡嘉民 著)
全書收錄程式交易基礎入門到進階的獲利策略,助讀者更能掌握短線交易的操作方法!
實體書、會員9折、全球運送 https://bit.ly/3nCnp9V
Google Play 電子書、試閱 https://bit.ly/3eKDhUB
各大書店現已有售
======================================================
【更多推薦影片】
➤蔡嘉民:【止蝕不止賺】程式交易新手入門必看 https://youtu.be/UvGbzu-A4eY
➤陸庭龍:對外匯、移民潮、人民幣、美金有何看法?https://youtu.be/w1Nl-BI9a-A
➤蔡金強:未來兩季最關注哪些板塊? https://youtu.be/ypPwkc79lTg
======================================================
【追蹤 WealtHub睿富,即可獲得最新財經金融資訊】
Facebook: https://www.facebook.com/wealthub.hk
Instagram: https://www.instagram.com/wealthub18/
YouTube: http://bit.ly/3938XAx
Website: http://www.wealthub.hk/
LinkedIn: WealtHub 睿富
投資涉及風險。本節目純為嘉賓個人意見分享,不構成任何投資招攬或建議。本節目對閣下因援引有關資料所引致的任何損失或損害概不負責。
algo 在 2G Review Youtube 的精選貼文
ขอขอบคุณผู้พัฒนา Algo Rocks และผู้จัดจำหน่าย TinyBuild Games ที่เอื้อเฝื้อโค๊ดมาให้เล่นให้เพื่อนๆ ได้ชมกันนะคะ สามารถซื้อเกมได้ทาง
https://www.epicgames.com/store/th/p/startup-panic
algo 在 Andrea Roa Youtube 的最讚貼文
Inscríbete gratis en el curso aquí http://andrearoa.net/terapeuta-angelical-basico Empieza este 15 de Marzo de 2021, y en él aprenderás todas las bases de la terapia angelical y la canalización angelical. Empieza a dar los pasos para formar tu emprendimiento espiritual como trabajadora de luz.
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CURSOS, TALLERES, MEDITACIONES http://andrearoa.net/
INSTAGRAM https://www.instagram.com/andrearoa_coach/
TWITTER https://www.twitter.com/andrearoa_coach/
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algo 在 演算法海牛 的美食出口停車場
B 班適合APCS 已達5 級分或相等程度有意參加資訊競賽(資訊奧林匹亞、學科能力競賽、NPSC)的同學課程資訊>>> https://algo-seacow.github.io/courses/2021-summer-B/. ... <看更多>