投稿時間:2023-06-10 23:06:54 RSSフィード2023-06-10 23:00 分まとめ(10件)

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Ruby	Rubyタグが付けられた新着投稿 - Qiita	Ruby の Net::HTTP でリクエストする	https://qiita.com/kudojp/items/2f034dab8459405aa3ac	response	2023-06-10 22:05:13
AWS	AWSタグが付けられた新着投稿 - Qiita	ECS on Fargate × TerraformでNginxを立てる	https://qiita.com/tech-white/items/9acd961868915de8fd64	ecsonfargate	2023-06-10 22:32:53
技術ブログ	Developers.IO	AWS と GitHub Actions の OIDC 接続で Pull Request の Merge のみをトリガーとする際の権限リソースを AWS CDK で作成する	https://dev.classmethod.jp/articles/use-aws-cdk-to-create-permission-resources-when-pr-merge-is-an-action-trigger-using-the-oidc-connection-between-aws-and-github-actions/	assumerole	2023-06-10 13:37:44
海外TECH	MakeUseOf	How to Fix the VMware "Sound Device ID Out of Range" Error on Linux	https://www.makeuseof.com/fix-vmware-sound-device-id-out-of-range-error-linux/	How to Fix the VMware amp quot Sound Device ID Out of Range amp quot Error on LinuxIs the quot Sound device ID out of range quot error preventing you from working on your VMware virtual machine Here are two easy ways to fix it	2023-06-10 13:30:18
海外TECH	MakeUseOf	How to Edit JPEG Files in Adobe Lightroom CC: A Step-by-Step Guide	https://www.makeuseof.com/adobe-lightroom-how-to-edit-jpeg-files/	lightroom	2023-06-10 13:16:18
海外TECH	DEV Community	Essential Keywords Every Ethereum Enthusiast Must Know	https://dev.to/sahil_4555/essential-keywords-every-ethereum-enthusiast-must-know-4600	Essential Keywords Every Ethereum Enthusiast Must KnowEthereum has emerged as one of the most influential platforms in the blockchain ecosystem It s decentralized nature and smart contract capabilities have revolutionized various industries However before diving into Ethereum it s essential to familiarize yourself with key keywords and concepts that form the foundation of this innovative technology Ethereum The keyword Ethereum refers to a decentralized blockchain platform and cryptocurrency that allows the creation and execution of smart contracts and decentralized applications DApps It was proposed by Vitalik Buterin in and launched in Ethereum differs from Bitcoin another popular cryptocurrency in that it is not solely focused on financial transactions Instead it provides a more general purpose platform for executing programmable contracts and applications Example A real time example of Ethereum in action is the development of decentralized finance DeFi applications DeFi applications aim to provide financial services and products in a decentralized manner eliminating the need for traditional intermediaries such as banks One popular DeFi application built on Ethereum is Uniswap Uniswap is a decentralized exchange protocol that allows users to trade ERC tokens directly from their Ethereum wallets It utilizes smart contracts to enable trustless and automated token swaps providing liquidity through liquidity pools When users interact with Uniswap they pay transaction fees in ETH to execute trades and interact with the smart contract The decentralized nature of Uniswap ensures that users have full control over their funds and can participate in trading activities without the need for a centralized exchange Blockchain A blockchain is a distributed database that consists of a chain of blocks where each block contains a set of transactions or other data These blocks are linked together in chronological order forming a chain Each block contains a unique identifier hash and a reference to the previous block which ensures the integrity and immutability of the data stored in the blockchain The decentralized nature of a blockchain means that it is maintained and updated by a network of computers nodes rather than a single central entity Transactions are validated and added to the blockchain through a consensus mechanism where participants in the network collectively agree on the validity of the transactions Blockchain technology provides several key features including transparency security immutability and decentralization Example In the Bitcoin blockchain each block contains a set of transactions When a user initiates a Bitcoin transaction it is broadcasted to the network of nodes Miners who are participants in the network compete to solve a complex mathematical puzzle to validate and add a new block of transactions to the blockchain This process is known as mining Once a block is successfully mined and added to the blockchain the transaction becomes part of the public ledger and is considered confirmed The decentralized nature of the Bitcoin blockchain ensures that no single entity has control over the network Transactions are transparently recorded on the blockchain allowing users to verify the history and ownership of Bitcoin funds The security of the blockchain is maintained through cryptographic algorithms making it difficult for malicious actors to tamper with the transaction data Smart Contracts Smart contracts are self executing contracts with the terms of the agreement directly written into code They automatically execute predefined actions once the conditions specified within them are met They are designed to facilitate verify or enforce the negotiation or performance of a contract Smart contracts eliminate the need for intermediaries and enable parties to interact directly securely and transparently Smart contracts are typically written in programming languages specifically designed for the blockchain such as Solidity for Ethereum They define the rules and conditions of a contract and once deployed on the blockchain they become immutable and self executing Smart contracts have access to the blockchain s decentralized infrastructure and can interact with other smart contracts and blockchain data They can receive input process information and automatically execute actions based on predefined conditions Smart contracts can be triggered by external events or by other smart contracts Example A real time example is a decentralized crowdfunding platform on Ethereum where a smart contract is created to handle the campaign Participants send funds directly to the smart contract which keeps track of the amount raised The contract executes actions like transferring funds to the creator if the funding goal is reached within the specified timeframe or refunding the funds if the goal is not met Smart contracts eliminate the need for intermediaries ensuring transparency and trust in the execution of agreements Ethereum Network The Ethereum network refers to the collection of nodes computers running Ethereum software and participating in the validation and propagation of transactions and smart contracts It encompasses various networks including the mainnet production network testnets Ropsten Rinkeby and others and private networks for development and testing purposes Example An example of the Ethereum network is the popular decentralized application DApp called CryptoKitties CryptoKitties is a game built on the Ethereum blockchain where users can buy breed and trade unique virtual cats When users interact with the CryptoKitties DApp their actions are executed on the Ethereum network For instance when a user purchases a CryptoKitty a transaction is initiated and broadcasted to the Ethereum network Miners on the network validate and process the transaction ensuring its correctness and security Once the transaction is confirmed and added to a block the ownership of the purchased CryptoKitty is updated on the blockchain The Ethereum network handles the validation execution and propagation of all CryptoKitties related transactions providing a secure and decentralized environment for users to interact with the game It ensures that the ownership of CryptoKitties is accurately recorded and that the transactions are transparently executed without the need for a central authority Ethereum Virtual Machine EVM The Ethereum Virtual Machine EVM is a runtime environment within the Ethereum blockchain network It executes smart contracts which are self executing agreements with predefined rules written in code The EVM ensures the consistent and secure execution of these smart contracts across the network allowing for the development of decentralized applications DApps on Ethereum It uses the concept of gas to prioritize and secure operations within the networkThe EVM s role is to execute the smart contract s logic enforce the rules and maintain the integrity and consistency of the decentralized DApp It provides a secure and deterministic runtime environment for the execution of smart contracts on the Ethereum blockchain Peer to Peer Network PP A peer to peer PP network is a type of decentralized network where participating devices called peers communicate and share resources directly with each other without the need for a central server In a PP network each peer can act as both a client and a server contributing resources and requesting services from other peers Here are some key characteristics and features of a peer to peer network Decentralization PP networks distribute the workload across multiple peers eliminating the need for a central authority or server Peers interact with each other on an equal basis contributing and consuming resources Resource Sharing Peers in a PP network can share various resources such as files bandwidth processing power or services Each peer contributes its resources to the network and can request resources from other peers Autonomy and Redundancy PP networks are resilient as there is no single point of failure If one peer becomes unavailable or leaves the network other peers can continue to operate and provide services independently Scalability PP networks can scale efficiently as the addition of new peers increases the available resources in the network This makes them suitable for large scale distributed applications or file sharing systems Self Organization Peers in a PP network discover and connect autonomously without relying on a central directory or server They use protocols like Distributed Hash Tables DHT or Peer Discovery Protocols to locate and communicate with other peers Node A node in the Ethereum network is a computer or device that runs Ethereum software and maintains a copy of the blockchain It participates in the validation and propagation of transactions smart contracts and other network activities Nodes communicate with each other to synchronize data and ensure the consensus of the network There are two main types of nodes Full Node A full node stores a complete copy of the Ethereum blockchain It validates and verifies each transaction and smart contract independently Full nodes help maintain the security and integrity of the network by independently verifying the blockchain s history They also contribute to the decentralization of the network by participating in the consensus process Light Node A light node also known as a light client does not store a complete copy of the blockchain Instead it relies on full nodes for blockchain data and validation Light nodes consume less storage space and bandwidth compared to full nodes but sacrifice some degree of decentralization and security Example A real time example of a node in the Ethereum network is a user s Ethereum wallet or a dApp browser like MetaMask These applications connect to the Ethereum network through nodes For instance when a user accesses their Ethereum wallet using MetaMask it connects to a selected node The node provides the necessary blockchain data for the wallet to function Users can view their account balance send transactions and interact with smart contracts through the wallet interface The node facilitates communication between the wallet application and the Ethereum blockchain ensuring that user actions are executed and responses from the blockchain are delivered back to the wallet Miners Miners are individuals or entities in a blockchain network who perform the process of mining Mining involves solving complex mathematical puzzles or algorithms to validate and confirm transactions Miners compete with each other to find the solution to the puzzle and the first miner to solve it earns the right to add a new block of transactions to the blockchain When a miner successfully solves the puzzle they create a new block that includes a set of validated transactions This block is then added to the existing blockchain forming a continuous chain of blocks The process of mining not only validates transactions but also secures the network against fraudulent activities as altering past blocks becomes computationally impractical due to the computational power required to do so Miners are rewarded for their efforts in the form of incentives In some blockchain networks such as Ethereum miners are rewarded with cryptocurrency tokens For example in Ethereum miners receive Ether ETH as a reward for successfully mining a block The mining process also involves transaction fees paid by users for their transactions to be prioritized and included in the blocks Example A real time example of miners can be seen in the Bitcoin network When a user initiates a Bitcoin transaction it is broadcasted to the network and miners collect these transactions to create a candidate block Miners then compete to find a solution to the mathematical puzzle associated with mining and the first miner to solve it adds the candidate block to the blockchain In the Bitcoin network miners earn newly minted Bitcoins and transaction fees as rewards for successfully mining a block Their computational efforts ensure the validation of transactions and the overall security of the blockchain network This process demonstrates the essential role of miners in maintaining a robust and trustworthy decentralized system Gas Gas refers to the unit of measurement for the computational effort required to execute operations or transactions on a blockchain network It is primarily associated with the Ethereum platform Gas is used to quantify the resources consumed during the execution of smart contracts and helps determine the fees required to process transactions Example In Ethereum when a user wants to execute a transaction or interact with a smart contract they need to specify the amount of gas they are willing to use and the price they are willing to pay for each unit of gas For instance let s say a user wants to transfer tokens using a smart contract They estimate that the transaction will require gas units They set a gas price of Gwei ETH per unit of gas and a gas limit of gas units The gas price is multiplied by the gas units to calculate the transaction fee In this case it would be ETH As the transaction is executed the smart contract operations consume gas deducting it from the gas limit If the gas limit is reached before the transaction completes it fails and the changes are rolled back Execution Client An execution client is a software application that serves as a bridge between users and the Ethereum network It enables users to interact with smart contracts send transactions and retrieve blockchain data Execution clients handle tasks such as signing transactions managing account information and communicating with the Ethereum network There are different types of execution clients available for Ethereum including Geth Parity and OpenEthereum These clients implement the Ethereum protocol and provide interfaces for users to interact with the blockchain Example A real time example of an execution client is the MetaMask wallet MetaMask is a popular browser extension that acts as an execution client and provides a user friendly interface for interacting with the Ethereum network When a user installs MetaMask and connects it to their Ethereum wallet it becomes an execution client Users can then access decentralized applications DApps directly from their web browsers MetaMask allows users to interact with smart contracts send and receive transactions and manage their Ethereum accounts For instance if a user wants to participate in a decentralized finance DeFi application they can connect MetaMask to the application MetaMask serves as the execution client handling the transaction signing process and communicating with the Ethereum network Users can then execute various actions within the DeFi application such as depositing funds swapping tokens or providing liquidity Consensus Client A consensus client is responsible for validating and agreeing upon the transactions and the order in which they are added to the blockchain It ensures that all network participants reach a consensus on the state of the blockchain meaning they agree on the validity and ordering of transactions Consensus clients typically implement a specific consensus algorithm such as Proof of Work PoW Proof of Stake PoS or other variants These algorithms determine how consensus is achieved in the network considering factors like computational power token ownership or reputation Example A real time example of a consensus client is the Geth client in the Ethereum network Geth is one of the most widely used clients that implement the Ethereum protocol and the consensus algorithm When a user runs Geth as a consensus client it connects to the Ethereum network and participates in the consensus process Geth verifies the validity of transactions executes smart contracts and contributes to the consensus mechanism of the network For example when a user submits a transaction to the Ethereum network Geth receives and validates it Geth then propagates the transaction to other nodes which also run consensus clients and participates in the consensus algorithm to determine the transaction s validity and order In this example Geth acts as a consensus client in the Ethereum network helping to maintain a decentralized and secure blockchain by participating in the consensus process It plays a vital role in reaching an agreement on the state of the Ethereum blockchain among network participants Proof Of Work PoW Proof of Work PoW in Ethereum is a mechanism used to validate and secure transactions on the Ethereum blockchain In simple terms it is a way to ensure that transactions are legitimate and prevent malicious activities Here s a simplified explanation of how Proof of Work works in Ethereum Miners In Ethereum miners are participants who compete with each other to solve complex mathematical puzzles Puzzle solving Miners use their computational power to solve these puzzles which require a significant amount of computational effort The puzzles are designed in such a way that the only way to solve them is through trial and error with no shortcuts available Validating transactions Miners collect pending transactions from the network and include them in blocks Mining process Miners bundle these transactions together in a block and start solving the puzzle associated with that block They repeatedly generate different solutions by guessing a random number until one of them finds a solution that satisfies the puzzle s requirements Proof of solution Once a miner finds a solution they broadcast it to the network as proof that they have done the necessary work to validate the transactions in that block Consensus Other participants in the network can quickly verify the validity of the solution provided by the winning miner They check if the solution meets the required criteria and if the transactions in the block are valid If everything is correct the block is considered validated Block reward The winning miner who successfully solves the puzzle and validates the block is rewarded with newly created Ether the native cryptocurrency of Ethereum and any transaction fees included in that block Difficulty adjustment The Ethereum network automatically adjusts the difficulty of the puzzles based on the total computational power of the network This adjustment ensures that new blocks are added to the blockchain approximately every seconds on average regardless of the total computational power of the network Example A popular example of PoW is Bitcoin mining Miners compete to solve complex mathematical puzzles by guessing different nonces The first miner who finds the correct nonce gets to add a new block of transactions to the Bitcoin blockchain and receives a reward in the form of newly created bitcoins The puzzles in Bitcoin mining involve finding a nonce that when combined with the block data produces a hash a unique digital fingerprint with a specific pattern Miners use powerful computers to calculate trillions of possibilities per second until one of them discovers the correct nonce By solving these puzzles miners secure the Bitcoin network and validate transactions The computational work required to solve the puzzles makes it difficult for anyone to manipulate the blockchain ensuring the system s integrity and reliability Proof Of Stake PoS Proof of Stake PoS is an alternative consensus mechanism used in Ethereum to validate and secure transactions on the blockchain Unlike Proof of Work which relies on computational power Proof of Stake uses a different approach that involves participants staking their cryptocurrency holdings to gain the right to validate transactions Here s a simplified explanation of how Proof of Stake works in Ethereum Validators Instead of miners Ethereum s Proof of Stake involves validators Validators are participants who hold a certain amount of Ether the native cryptocurrency of Ethereum and are willing to lock up or stake their coins as collateral Block selection Validators take turns being randomly chosen to create new blocks and validate transactions The chances of being selected as a validator are based on the proportion of Ether they have staked compared to others in the network The more Ether staked the higher the chances of being selected Validation process When a validator is selected they create a new block and include transactions within it Instead of solving complex puzzles like in Proof of Work validators validate transactions based on the amount of Ether they have staked This means that validators have an economic incentive to act honestly since any malicious behavior may result in their staked Ether being slashed or taken away Consensus and rewards Once a block is created and validated other validators in the network verify its correctness If the block is deemed valid it is added to the blockchain and the validator who created the block is rewarded with transaction fees and additional Ether as a form of incentive for their participation Security and decentralization Proof of Stake aims to secure the blockchain by ensuring that validators have a stake in the system If a validator tries to act dishonestly or attack the network they risk losing their staked Ether which acts as a deterrent against malicious behavior The more Ether staked in the network the more decentralized and secure it becomes Finality In Proof of Stake transactions are finalized more quickly compared to Proof of Work Once a block is added to the blockchain and a certain number of subsequent blocks are built on top of it the transactions in that block are considered final and cannot be reversed Example An example of PoS in action is the Tezos blockchain network Tezos utilizes PoS to secure its network and validate transactions In Tezos stakeholders who hold XTZ cryptocurrency can participate in the consensus process Stakeholders can choose to become bakers by locking up a certain amount of XTZ as collateral and participating in block validation Bakers are randomly selected to create and validate new blocks based on the amount of XTZ they hold and are willing to stake The Tezos PoS system allows for more energy efficient and environmentally friendly consensus compared to PoW systems like Bitcoin It also promotes decentralization by giving stakeholders the opportunity to actively participate in securing the network and earning rewards Understanding essential keywords is crucial for Ethereum enthusiasts Concepts such as smart contracts the EVM gas nodes miners and execution clients provide a solid foundation for engaging with Ethereum By grasping these fundamentals enthusiasts can navigate decentralized applications participate in consensus and make informed decisions As Ethereum continues to evolve staying updated with the latest keywords is essential for maximizing involvement Embrace the potential of this groundbreaking technology and continue the Ethereum journey with enthusiasm Happy learning and exploring Ethereum	2023-06-10 13:27:29
海外TECH	DEV Community	Reflecting on Progress and Redefining Goals	https://dev.to/bekahhw/reflecting-on-progress-and-redefining-goals-2oo9	Reflecting on Progress and Redefining GoalsThis post is inspired by the Virtual Coffee Monthly Challenge and our first discuss post This is not the year that I thought it would be It s been bad worse better and pretty good all in that order After facing a lot of unexpecteds in the last year it s been hard to set goals and try to achieve anything long term I ve been disappointed excited motivated and sad along the way In a lot of ways it s been exhausting but I think I m moving into a place I really like The year didn t start off on the best note I was unexpectedly laid off and it hit me hard Living in uncertainty isn t really my strength But having that space between jobs did make me realize just how burnt out and exhausted I had become constantly feeling blocked and unable to make any real progress On top of that the depression from the previous year carried over into the first couple of months of I struggled with motivation and it was really hard for me to admit because as a mom I m used to taking care of everyone else It s challenging to try to take time to take care of yourself when there are so many people depending on you On top of that I fell into some bad habits as I tried to cope with it all Luckily the last few months have been a turning point My mental health is in a much better place today and my motivation is back I didn t realize how much I d missed that motivation As I navigated these personal challenges professionally things took an unexpected and exciting turn I found myself at OpenSauced working in Developer Experience DevEx and it s been really really good for me I think I thrive in early stage startups and small teams I love how DevEx is a blend of Developer Relations DevRel and Community Experience It feels like home The autonomy to pursue different initiatives and explore approaches to support the open source community has been really energizing Professionally I m right where I want to be even though I didn t even know this was where I wanted to be There s still a lot of improvement I d like to see for myself My goal is to write creatively for at least minutes every day Now I know it doesn t sound like much but by the end of the day I m usually so tired and I ve already written so much for work that it s hard to find the energy It s something I need to work on consistently though because creative writing brings me joy and lets me be a different person Sometimes I feel like there s just not enough time in the day But here s the funny thing I ve heard from multiple people that if we magically added more hours I d somehow find a way to fill them too I guess that s just part of who I am I d do all the things all the time if I can But I m learning to accept that I can t do it all at once I m learning to prioritize make conscious choices and make sure my time is spent on activities that align with my values and goals I like where I am but I m always working to refine do more and be a better person for the people around me How s your half a year been	2023-06-10 13:03:26
海外ニュース	Japan Times latest articles	Tokito Oda wins French Open to become youngest Grand Slam wheelchair singles champ	https://www.japantimes.co.jp/sports/2023/06/10/tennis/tokito-oda-grand-slam-youngest/	Tokito Oda wins French Open to become youngest Grand Slam wheelchair singles champOda defeated top seeded Alfie Hewett of Britain avenging his loss in their Australian Open final matchup in January	2023-06-10 22:42:07
ニュース	BBC News - Home	Boris Johnson: Laura Kuenssberg on the facts, farce and his future	https://www.bbc.co.uk/news/uk-politics-65865946?at_medium=RSS&at_campaign=KARANGA	kuenssberg	2023-06-10 13:26:09
ニュース	BBC News - Home	Annecy stabbings suspect held over attempted murders	https://www.bbc.co.uk/news/world-europe-65866514?at_medium=RSS&at_campaign=KARANGA	alpine	2023-06-10 13:09:04