投稿時間:2023-01-08 02:10:41 RSSフィード2023-01-08 02:00 分まとめ(10件)

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python	Pythonタグが付けられた新着投稿 - Qiita	ABC284 F - ABCBAC ローリングハッシュ解法	https://qiita.com/mo124121/items/97e2c5eabadd45fa510f	abcfabcbac	2023-01-08 01:27:00
js	JavaScriptタグが付けられた新着投稿 - Qiita	shebang に対応しているプログラミング言語を簡易的に調査した結果	https://qiita.com/j5c8k6m8/items/949c5cbf9fc6c67dd814	javascriptecmascriptes	2023-01-08 01:54:52
海外TECH	MakeUseOf	How to Update Audio Drivers on Windows	https://www.makeuseof.com/update-audio-drivers-windows/	problems	2023-01-07 16:16:16
海外TECH	MakeUseOf	What Are Crypto Derivatives? 4 Types of Derivatives Explained	https://www.makeuseof.com/crypto-derivatives-explained/	asset	2023-01-07 16:16:16
海外TECH	MakeUseOf	What Are Crypto Exchange Bank Runs and How Do They Work?	https://www.makeuseof.com/crypto-exchange-bank-runs-explained/	crypto	2023-01-07 16:01:15
海外TECH	DEV Community	Block Anatomy of a Blockchain	https://dev.to/siddharthsing/block-anatomy-of-a-blockchain-4773	Block Anatomy of a BlockchainSo far in this article series we have discussed the Blockchain its roadmap and some of its key concepts Now we will be diving a little deep into blockchain and breaking down a single unit or a block in the blockchain and learning about it Blockchain StructureOne can imagine a Blockchain as a linked list Similar to a Linked List the blocks of a blockchain are connected through something that something in the linked list is the address of the previous node but in the blockchain it is the Merkle Hash value of the previous block which is stored in the successor block An obvious question might arise in your mind how many blocks can be present in a blockchain The answer is any number of blocks are possible as long as the maintainers are good with that You can check this link to see how many blocks of some famous blockchains are created to date Here is an image of Ethereum s block count Block StructureA block in a blockchain constitutes of two components Header which is further divided into six components and Ledger the main transaction database Below is the image to roughly visualize a block in a blockchain The block structure in the image above does not show all the components of the block s head but I will be listing all of them in the next section Block HeaderThe Block Header is an bytes long string consisting of six components Version bytes A hash code of the previous block bytes The current block s Merkle Hash code value bytes Timestamp bytes Bits bytes Nonce value bytes Version It is as the name is the version number of the protocol used in the chain Previous block hash The block header contains a bit long Merkle Hash code value of the previous block to stay connected with the blockchain The first block in any blockchain is called a Genesis block A block that doesn t have any previous block hash Merkle Hash value Merkle hash code value of each block is a combination of all the hashes changed during each transaction in a block It is a bit long Hash code which acts as an identity or name for a block Timestamp Each block contains a Unix time timestamp In addition to serving as a source of variation for the block hash they also make it more difficult for an adversary to manipulate the block chain Bits Bits can be understood as a level of difficulty assigned to the miners for the process of proof of work Adding a new block in a blockchain is a tremendously difficult task miners have to solve a very tough mathematical puzzle not literally a puzzle in order to add a block The difficulty of that puzzle is stored in the Bits field Nonce It is that puzzle that miners are trying to solve extensively to get rewarded Nonce itself is a full article topic so I will not be emphasizing it too much here Block LedgerThe Block ledger contains the details of all the transactions stored in a block A block can store up to transactions The maximum size a block can achieve is MB depending upon the number of transactions recorded in a particular block As long as the chain length increases it becomes impossible to update or manipulate these transactions and this makes the blockchain immutable ConclusionThat was all about the block structure of a blockchain I covered all the components of the block s structure Hope you like the article More articles on this series coming every week so stay tuned Writer s SupportIf you find the article useful show some love ️by following me on linkedin or github or instagram or twitter or everywhere	2023-01-07 16:26:29
Apple	AppleInsider - Frontpage News	Inside Apple's Singapore Marina Bay Sands retail store	https://appleinsider.com/articles/23/01/07/inside-apples-singapore-apple-marina-bay-sands-retail-store?utm_medium=rss	Inside Apple x s Singapore Marina Bay Sands retail storeThe Marina Bay Sands Apple Store in Singapore is the first of its kind appearing to float on water in Singapore s Marina Bay ーand we recently visited it Apple Marina Bay Sands in SingaporeSaid by Apple to be inspired by the Roman Pantheon the Apple Marina Bay Sands opened during the pandemic on September and makes its mark as the only floating dome Apple Store on the planet Read more	2023-01-07 16:44:14
海外TECH	Engadget	A dead NASA satellite is returning to Earth after 38 years in space	https://www.engadget.com/nasa-earth-radiation-budget-satellite-returning-to-earth-after-38-years-in-space-165244903.html?src=rss	A dead NASA satellite is returning to Earth after years in spaceAfter nearly four decades in space NASA s retried Earth Radiation Budget Satellite ERBS is about to fall from the sky On Friday the agency said the likelihood of wreckage from ERBS harming anyone on Earth is “very low NASA expects most of the pound satellite will burn upon re entry Earlier this week the Defense Department predicted ERBS would re enter the Earth s atmosphere on Sunday at approximately PM ET give or take hours While it may be a household name the Earth Radiation Budget Satellite had anything but a dull history Per Phys org the Space Shuttle Challenger carried the satellite to space in a little more than a year before Challenger s heartbreaking demise in early Astronaut Sally Ride the first American woman to fly to space released ERBS from Challenger s cargo hold using the spacecraft s robotic arm During that same mission Ride s crewmate Kathryn Sullivan became the first American woman to perform a space walk It was also the first mission to see two female astronauts fly to space together As for ERBS it went on to collect ozone and atmospheric measurements until Scientists used that data to study how Earth absorbs and radiates solar energy ERBS s contribution to science is even more impressive when you consider NASA initially expected it would only stay functional for two years	2023-01-07 16:52:44
海外科学	NYT > Science	‘Consciousness’ in Robots Was Once Taboo. Now It’s the Last Word.	https://www.nytimes.com/2023/01/06/science/robots-artificial-intelligence-consciousness.html	difficult	2023-01-07 16:28:03
ニュース	BBC News - Home	FA Cup: Alexis Mac Allister nets 'remarkable' backheel for Brighton against Middlesbrough	https://www.bbc.co.uk/sport/av/football/64199373?at_medium=RSS&at_campaign=KARANGA	FA Cup Alexis Mac Allister nets x remarkable x backheel for Brighton against MiddlesbroughArgentina s Alexis Mac Allister pulls off a Cruyff esque flick into the bottom corner as Brighton dominate Middlesbrough in the FA Cup third round	2023-01-07 16:37:48