關於 be creator ，我們在網路上蒐集到這些相關的討論、資訊與評價

"U“ are your best asset!

Make U a priority.
Make your values a priority.
Make your mindset a priority.
Make your vision a priority.
Make your health a priority.

Know yourself, cause no one else can predetermine where you go save for our creator. So often us ladies we tend to forget ourselves cause we put others first, that's just our nature.

A better U, is better for all those around you. I don't think it's being selfish but it's being responsible.

October I'm ready for U1st.

Calling out to all my @underarmour Sisters. Be bringing the fire in all circumstances.

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✨ YOU ARE THE CREATOR OF YOUR LIFE!

As a coach, meeting people who want to change their life is my daily work.

I call this “moving from Point A to Point B.”

Point A is where you are, with your current frustrations, problems, and challenges.

Point B is where you want to be, the life you love, the future your heart desires.

In a perfect universe, everyone would be sailing effortlessness from Point A to Point B. But this is not the universe we live in.

In our magnificent, messy universe, sometimes we don’t know what our Point B is. Other times, we are stuck in point A, held back by different forces, unable to budge an inch. And very often, we’re not moving as powerfully as we know we could.

I often said to a potential client that: “As your coach, I’m not going to say: ‘Hop on my back, Susan! I’ll carry you from Point A to Point B on hyper-speed!”

That always gets a good laugh. But they know there’s truth in it.

They know that change is hard work and that work must come from them.

But what they may not know, like Bria when she first met me, was that real change starts from within.

Most problems in our life are created by ourselves, not our job, our boss, or our mother-in-law.

𝐖𝐞 𝐚𝐫𝐞 𝐭𝐡𝐞 𝐜𝐫𝐞𝐚𝐭𝐨𝐫 𝐨𝐟 𝐨𝐮𝐫 𝐥𝐢𝐟𝐞, 𝐢𝐧𝐜𝐥𝐮𝐝𝐢𝐧𝐠 𝐚𝐥𝐥 𝐨𝐟 𝐨𝐮𝐫 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬.

This can be a depressing statement, but it can also be empowering.

If we can create our problems, we can also make our blessing. We just need to know where to focus our creative power.
---
💛 Find out why you shouldn't quit your job yet with this step-by-step guide: https://bit.ly/2XB64q0

📜 [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

すべての人に感謝しています。

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2年ぶりにMusic Videoを撮影しました。
3人体制で走ってきた二年半、すべての答えは明日の動画で。

そら

Director:Ariyama.mp4
Cinematographer:MasatoTanaka


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** NOTE **
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動画の字幕作成にご協力ください！日本語への文字起こしはもちろん、英語への翻訳字幕へ協力いただけると非常に助かります！
方法についてはこちら: https://support.google.com/youtube/answer/6054623?hl=ja