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Revisiting “Polaroid Fantasy”, damn we released this album just before COVID started and only performed it at a gig once. Such a shame, since I really do love this song. Give it a listen ❤️
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#art #artwork #mymusic #singersongwriter #drawing #music #originalsong #originalmusic
These new James Bond teasers and Daniel Craig interview clips have recently made me hanker for martinis.
The Colombian Ortodoxy Gin makes a damn good one. With its citrusy notes from the limon mandarino (a native colombian fruit) mixed with berries spices and peels - it is a yummy refreshing gin. What makes it more interesting is that it is aged in ex-rum barrels.
This gin was actually created for personal use for the The Dictador rum former president who also loved gin. At 43% abv it retails at Rm280. Check it out at Single and Available Whisky Shop and don't say I #bojio
#angeltini #angeltinimy
📜 [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
加藤ミリヤ5thシングル「ソツギョウ」
http://miliyah.com/
-Lyric-
＊
たった一つ見つけ出す その日が来る
壊されそうで it feels like killing 支配の中で
ねえ 泣いて泣いて泣いて泣いた答えここに
信じてる私 いつもrespect
けだるい in da morning 眠たい目をこすり こすり
シャツに腕さっと通す 変わらない日々は
すれ違う大人たちの 視線ひどく感じる
(苛立ってくる 睨んでみる) fu-
Don't talk 2 me うるさい 聞きたくない ほっといて わかる訳ない
ただ泣けてくる
ああ もっと ねえ もっと 自由になりたいよ
＊Repeat
教室から見える景色 高層building
寂しい 虚しい 一人だけ取り残されてる
ノートに いつだって書いていた言葉は
(気付いて欲しい ここに居るのに)
Don't give a damn 笑い声が痛い くだらない噂話うるさい
今すぐ抜け出したいよ
机に座って まだ夢見てる oh no no no
＊Repeat
some teachers hated me
わかる訳ない 何も知らないくせに
i never go there no more
意味もない 行き場だってない
私だったから
たった一つ見つけ出す その日が来る
壊されそうで it feels like killing 助けを求めて
ねえ 泣いて泣いて泣いて泣いた答えここに
今 支配の中を抜け出して
＊Repeat
わたしたちに きっと確かな明日があるの?
教科書も捨てた 風に吹かれた 自由になった
ねえ 泣いて泣いて泣いて泣いた答えここに
譲らない これがわたしのソツギョウ
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西洋音樂愛好者✨這裡不會有冗長的介紹文卻是個讓你挖歌的好地方😎
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---------------------------------------------------------------------------
Lyrics:
I lie in bed after dark
And I talk to the stars
They tell me that it´s okay
So far away you might as well
Just be on mars
Some reason I'm not okay
So I convince myself
That I am bigger than this mess
What´s the point in being suffocated
With distress
I need my space
I´ll live with grace
Cuz I can´t breathe between the days
Of traveling through my feelings
I need my space
I need my space
I´ll live with grace
I lie in bed after dark
Waiting for you
Cuz you said that you would call
Forgot I changed my name to pluto
Boy you got me feeling so damn small
So I convince myself
That I am bigger than this mess
What´s the point in being suffocated
With distress
We can´t breathe
Any longer
We need some air
I need my space
I need with grace
I said I´ll leave with grace
Cuz I can´t breathe between the days
Of traveling through my feelings
I need my space
I need my space
I need with grace
I said I´ll leave with grace
Cuz I can´t breathe between the days
Of traveling through my feelings
I need my space
#Space #TwinLights #HighBeats #Lyrics
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damn it 在 Damn It！Vintage【 顛復古】古著百貨行 的推薦與評價
Damn It ！Vintage【 顛復古百貨行】 台北市赤峰街33巷2號1樓營業時間：PM3:30 - PM9:30 BUSINESS HOURS：PM3:30 - PM9:30 赤峰街33巷2號1樓, Taipei, Taiwan 103. ... <看更多>