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Wednesday, July 16, 2025
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  • AI
    Artificial Intelligence

    Building End-to-End Data Pipelines: From Data Ingestion to Analysis

    Artificial Intelligence

    How Rapid7 automates vulnerability risk scores with ML pipelines using Amazon SageMaker AI

    Artificial Intelligence

    Build a conversational data assistant, Part 2 – Embedding generative business intelligence with Amazon Q in QuickSight

    Artificial Intelligence

    Enabling Differentially Private Federated Learning for Speech Recognition: Benchmarks, Adaptive Optimizers, and Gradient Clipping

    Artificial Intelligence

    Overcoming Vocabulary Constraints with Pixel-level Fallback

    Artificial Intelligence

    Uphold ethical standards in fashion using multimodal toxicity detection with Amazon Bedrock Guardrails

    Artificial Intelligence

    10 Surprising Things You Can Do with Python’s datetime Module

    Artificial Intelligence

    New capabilities in Amazon SageMaker AI continue to transform how organizations develop AI models

    Artificial Intelligence

    Unlock retail intelligence by transforming data into actionable insights using generative AI with Amazon Q Business

  • Apple
    Emmys 2025: Apple TV+ lands nominations in all major categories

    Emmys 2025: Apple TV+ lands nominations in all major categories

    AirPods hearing test, Apple Watch Sleep Apnea alert expand availability

    AirPods hearing test, Apple Watch Sleep Apnea alert expand availability

    iPhone screenshots are getting three powerful new features in iOS 26

    iPhone screenshots are getting three powerful new features in iOS 26

    PSA: Google Chrome to soon drop support for macOS Big Sur

    PSA: Google Chrome to soon drop support for macOS Big Sur

    Car Keys are coming to the Wallet app for 13 new vehicle brands soon

    Car Keys are coming to the Wallet app for 13 new vehicle brands soon

    The first 25W Qi 2.2 charger is here–just in time for the iPhone 17

    The first 25W Qi 2.2 charger is here–just in time for the iPhone 17

    July 15, 2025 – Apple leadership, Mac growth

    iOS 26 public beta rumored to launch next week

    iOS 26 public beta rumored to launch next week

    Future Apple Watch or iPhone may gain a camera that’s completely hidden when not in use

    Future Apple Watch or iPhone may gain a camera that’s completely hidden when not in use

  • ComputerWorld
    Cognition agrees to buy what’s left of Windsurf

    Cognition agrees to buy what’s left of Windsurf

    How agentic AI will change IT support roles – Computerworld

    How agentic AI will change IT support roles – Computerworld

    Apple’s done innovating? Be serious – Computerworld

    Apple’s done innovating? Be serious – Computerworld

    For July, a ‘big, broad’ Patch Tuesday release – Computerworld

    For July, a ‘big, broad’ Patch Tuesday release – Computerworld

    AI coding tools can slow down seasoned developers by 19%

    AI coding tools can slow down seasoned developers by 19%

    Will IT turn the AI bot battle into a money maker? (And is that even a good idea?) – Computerworld

    Will IT turn the AI bot battle into a money maker? (And is that even a good idea?) – Computerworld

    Tariff uncertainty hits US PC shipments in Q2 – Computerworld

    Tariff uncertainty hits US PC shipments in Q2 – Computerworld

    The fast way to fix a frozen Start menu or taskbar in Windows – Computerworld

    The fast way to fix a frozen Start menu or taskbar in Windows – Computerworld

    Microsoft’s 19-hour Outlook outage exposes fragility in cloud infrastructure – Computerworld

    Microsoft’s 19-hour Outlook outage exposes fragility in cloud infrastructure – Computerworld

  • Gaming
    The Legend of Zelda: Ocarina of Time Walkthrough Part 122

    The Legend of Zelda: Ocarina of Time Walkthrough Part 122

    Walkthrough FR l Zelda Minish Cap l 32 Obtenir le Boomerang Magique

    Walkthrough FR l Zelda Minish Cap l 32 Obtenir le Boomerang Magique

    Majora's Mask Walkthrough Ep1 ClockTown-Gathering Items

    Majora's Mask Walkthrough Ep1 ClockTown-Gathering Items

    The Legend of Zelda Ocarina of Time Walkthrough parte 33 Fire Temple parte 3 Megaton Hammer

    The Legend of Zelda Ocarina of Time Walkthrough parte 33 Fire Temple parte 3 Megaton Hammer

    Avowed update basically reinvents the fighter and ranger classes, while also adding new weapons and better Steam Deck optimization

    Avowed update basically reinvents the fighter and ranger classes, while also adding new weapons and better Steam Deck optimization

    magical world part 10 || lost land 8

    magical world part 10 || lost land 8

    The Legend of Zelda: LINK'S AWAKENING Intro Nintendo Switch Gameplay Walkthrough

    The Legend of Zelda: LINK'S AWAKENING Intro Nintendo Switch Gameplay Walkthrough

    Bungie says it’s ‘actively re-recording’ some voice lines for Destiny 2: The Edge of Fate after fans notice one of the game’s best-known heroes suddenly sounds like one of its most notorious villains

    Bungie says it’s ‘actively re-recording’ some voice lines for Destiny 2: The Edge of Fate after fans notice one of the game’s best-known heroes suddenly sounds like one of its most notorious villains

    Recital At Warbler's Nest Breath of the wild Find Kheel Quest

    Recital At Warbler's Nest Breath of the wild Find Kheel Quest

  • Retro Rewind
    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 57 April 1994

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: Computer Gaming World Magazine Issue 73 December 1998

    Retro Rewind: Computer Gaming World Magazine Issue 73 December 1998

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

  • Tech Art
    My 2024 Cozy Digital Art Desk Setup | iPad Accessories, Filming Gear & Digital Art Supplies

    My 2024 Cozy Digital Art Desk Setup | iPad Accessories, Filming Gear & Digital Art Supplies

    Sun Sajna Kal Aaya Sapna Song Animation Editing | Flipaclip Digital Animation Editing

    Sun Sajna Kal Aaya Sapna Song Animation Editing | Flipaclip Digital Animation Editing

    Sembang  Seni # 2 – Seni Visual dan Augmented Reality : Peranginan Sri Perigi

    Sembang Seni # 2 – Seni Visual dan Augmented Reality : Peranginan Sri Perigi

    Dasha Taran – Vector Art Tutorial – Medibang Paint Android (Part 1 : Lineart)

    Dasha Taran – Vector Art Tutorial – Medibang Paint Android (Part 1 : Lineart)

    Create a VintageTag with Ephemera and Napkins! Mixed media Full #howto video step by step Shabby

    Create a VintageTag with Ephemera and Napkins! Mixed media Full #howto video step by step Shabby

    Virtual Reality is Not What You Think

    Virtual Reality is Not What You Think

    MAJU TALK EPISODE # 2   I  Media and Art Industry Role in Pakistan

    MAJU TALK EPISODE # 2 I Media and Art Industry Role in Pakistan

    Draw A Lotus Flower in Ms Paint | Kamal Kaa Phool Ms Paint Me Kaise Bnaye

    Draw A Lotus Flower in Ms Paint | Kamal Kaa Phool Ms Paint Me Kaise Bnaye

    INSIDE Mirror Mirror: ArtScience Museum's NEW interactive exhibition

    INSIDE Mirror Mirror: ArtScience Museum's NEW interactive exhibition

  • Tech Deals
    Micro Center 64GB Class 10 Micro SDXC Flash Memory Card 20 Pack with Adapter for Mobile…

    Micro Center 64GB Class 10 Micro SDXC Flash Memory Card 20 Pack with Adapter for Mobile…

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    Two Memory Cards Micro SD Cards 128GB with SD Adapter, High Speed Class 10, Microsd, TF…

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    Crucial P3 Plus 1TB PCIe Gen4 3D NAND NVMe M.2 SSD, up to 5000MB/s – CT1000P3PSSD8

    Canon EOS R50 Mirrorless Camera RF-S18-45mm F4.5-6.3 is STM Lens Kit, 24.2 Megapixel…

    Canon EOS R50 Mirrorless Camera RF-S18-45mm F4.5-6.3 is STM Lens Kit, 24.2 Megapixel…

    LEGO Star Wars: The Force Awakens – Xbox 360 Standard Edition

    LEGO Star Wars: The Force Awakens – Xbox 360 Standard Edition

    Western Digital 10TB WD Purple Surveillance Internal Hard Drive HDD – SATA 6 Gb/s, 256…

    Western Digital 10TB WD Purple Surveillance Internal Hard Drive HDD – SATA 6 Gb/s, 256…

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    NexStar 6G, 2.5” SATA III to USB 3.2 Gen1 External SSD/HDD Enclosure, ID: Black

    Toshiba Canvio Basics 4TB Portable External Hard Drive USB 3.0, Black – HDTB540XK3CA

    Toshiba Canvio Basics 4TB Portable External Hard Drive USB 3.0, Black – HDTB540XK3CA

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    Vansuny 64GB Type C Flash Drive 2 in 1 OTG USB 3.0 + USB C Memory Stick with Keychain…

  • Techs Got To Eat
    Bacon & Spinach Mug Quiche: 3-Minute Gourmet Breakfast

    Bacon & Spinach Mug Quiche: 3-Minute Gourmet Breakfast

    Cheesy Broccoli Rice Mug: 5-Minute Super Comfort Food

    Cheesy Broccoli Rice Mug: 5-Minute Super Comfort Food

    Top 10 Vegetarian Recipes for 2025: Easy and Nutritious Meals for Busy People

    Top 10 Vegetarian Recipes for 2025: Easy and Nutritious Meals for Busy People

    Bacon Mug Lasagna: 5-Minute Microwave Meat Lover’s Dream

    Bacon Mug Lasagna: 5-Minute Microwave Meat Lover’s Dream

    Bacon Fried Rice Mug: 5-Minute Microwave Meal

    Bacon Fried Rice Mug: 5-Minute Microwave Meal

    Bacon & Cheddar Mug Biscuit: 2-Minute Savory Comfort

    Bacon & Cheddar Mug Biscuit: 2-Minute Savory Comfort

    Loaded Bacon Cheesy Potato Mug: 5-Minute Comfort Food

    Loaded Bacon Cheesy Potato Mug: 5-Minute Comfort Food

    Peanut Butter Banana Mug Muffin: 5-Minute Protein Snack

    Peanut Butter Banana Mug Muffin: 5-Minute Protein Snack

    Oreo Mug Cake: 2-Minute Cookie & Cake Combo!

    Oreo Mug Cake: 2-Minute Cookie & Cake Combo!

  • Tesla
    2025 Upgraded Sunshade Top Window for Tesla Cybertruck Foldable No Gaps Nano Ice Crystal…

    2025 Upgraded Sunshade Top Window for Tesla Cybertruck Foldable No Gaps Nano Ice Crystal…

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    Center Console Silicone Mat for 2024 Tesla Cybertruck Interior Accessories – TPE…

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    Tesla’s retro-futuristic diner and Supercharger is here and it looks sick

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    Auto Sunroof Drain Cleaning Tool, 78 Inch Long Pipe Cleaning Brush Windshield Wiper…

    PENSUN Rear Under Seat Storage Box Fit for Tesla Cybertruck 2024, Hidden Second Row…

    PENSUN Rear Under Seat Storage Box Fit for Tesla Cybertruck 2024, Hidden Second Row…

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    RYANSTAR RACING Black Car Door Handles Compatible with Tesla Cybertruck 2023 2024 2025 4…

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    Tesla finally launches in India, but at a price that doesn’t make sense

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    Cyber Hooks Heavy Duty Steel L Track Cleat Hooks – 4PCS Set, OEM Style Compatible with…

  • UFO
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    New Series | UFOs: Investigating the Unknown | National Geographic MENA #shorts

    Roswell Conspiracies: Aliens, Myths & Legends (Renewed)

    Roswell Conspiracies: Aliens, Myths & Legends (Renewed)

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    New Alien Race Uncovered in Mysterious Tablets (Season 1) | Ancient Aliens: Origins

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    New York Eye & Ear Control

    Drones with Camera for Adults 6K Foldable Headless Drone with Obstacle Avoidance Function Optical Flow Positioning Gesture Photography with Storage Bag 2 Battery

    Drones with Camera for Adults 6K Foldable Headless Drone with Obstacle Avoidance Function Optical Flow Positioning Gesture Photography with Storage Bag 2 Battery

    Women’S Sarong Coverups Beach Bathing Suit Wrap Skirt Sheer Bikini Wraps Chiffon Cover Ups For Swimwear

    Women’S Sarong Coverups Beach Bathing Suit Wrap Skirt Sheer Bikini Wraps Chiffon Cover Ups For Swimwear

    JWST's Mind Blowing Exoplanet Discovery!  #space #spaceexploration #exoplanets #nasa #fyp #shorts

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    Space Theme Birthday Candle, Shiny Astronaut Number Candle Spaceship Outer Space Cake Topper Perfect Universe Rocket Spacecraft Cake Decorations and Party Favors(Number 1)

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    The Dark Truth About 23andMe

    The Dark Truth About 23andMe

  • AI
    Artificial Intelligence

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    Artificial Intelligence

    How Rapid7 automates vulnerability risk scores with ML pipelines using Amazon SageMaker AI

    Artificial Intelligence

    Build a conversational data assistant, Part 2 – Embedding generative business intelligence with Amazon Q in QuickSight

    Artificial Intelligence

    Enabling Differentially Private Federated Learning for Speech Recognition: Benchmarks, Adaptive Optimizers, and Gradient Clipping

    Artificial Intelligence

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    Artificial Intelligence

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    Artificial Intelligence

    10 Surprising Things You Can Do with Python’s datetime Module

    Artificial Intelligence

    New capabilities in Amazon SageMaker AI continue to transform how organizations develop AI models

    Artificial Intelligence

    Unlock retail intelligence by transforming data into actionable insights using generative AI with Amazon Q Business

  • Apple
    Emmys 2025: Apple TV+ lands nominations in all major categories

    Emmys 2025: Apple TV+ lands nominations in all major categories

    AirPods hearing test, Apple Watch Sleep Apnea alert expand availability

    AirPods hearing test, Apple Watch Sleep Apnea alert expand availability

    iPhone screenshots are getting three powerful new features in iOS 26

    iPhone screenshots are getting three powerful new features in iOS 26

    PSA: Google Chrome to soon drop support for macOS Big Sur

    PSA: Google Chrome to soon drop support for macOS Big Sur

    Car Keys are coming to the Wallet app for 13 new vehicle brands soon

    Car Keys are coming to the Wallet app for 13 new vehicle brands soon

    The first 25W Qi 2.2 charger is here–just in time for the iPhone 17

    The first 25W Qi 2.2 charger is here–just in time for the iPhone 17

    July 15, 2025 – Apple leadership, Mac growth

    iOS 26 public beta rumored to launch next week

    iOS 26 public beta rumored to launch next week

    Future Apple Watch or iPhone may gain a camera that’s completely hidden when not in use

    Future Apple Watch or iPhone may gain a camera that’s completely hidden when not in use

  • ComputerWorld
    Cognition agrees to buy what’s left of Windsurf

    Cognition agrees to buy what’s left of Windsurf

    How agentic AI will change IT support roles – Computerworld

    How agentic AI will change IT support roles – Computerworld

    Apple’s done innovating? Be serious – Computerworld

    Apple’s done innovating? Be serious – Computerworld

    For July, a ‘big, broad’ Patch Tuesday release – Computerworld

    For July, a ‘big, broad’ Patch Tuesday release – Computerworld

    AI coding tools can slow down seasoned developers by 19%

    AI coding tools can slow down seasoned developers by 19%

    Will IT turn the AI bot battle into a money maker? (And is that even a good idea?) – Computerworld

    Will IT turn the AI bot battle into a money maker? (And is that even a good idea?) – Computerworld

    Tariff uncertainty hits US PC shipments in Q2 – Computerworld

    Tariff uncertainty hits US PC shipments in Q2 – Computerworld

    The fast way to fix a frozen Start menu or taskbar in Windows – Computerworld

    The fast way to fix a frozen Start menu or taskbar in Windows – Computerworld

    Microsoft’s 19-hour Outlook outage exposes fragility in cloud infrastructure – Computerworld

    Microsoft’s 19-hour Outlook outage exposes fragility in cloud infrastructure – Computerworld

  • Gaming
    The Legend of Zelda: Ocarina of Time Walkthrough Part 122

    The Legend of Zelda: Ocarina of Time Walkthrough Part 122

    Walkthrough FR l Zelda Minish Cap l 32 Obtenir le Boomerang Magique

    Walkthrough FR l Zelda Minish Cap l 32 Obtenir le Boomerang Magique

    Majora's Mask Walkthrough Ep1 ClockTown-Gathering Items

    Majora's Mask Walkthrough Ep1 ClockTown-Gathering Items

    The Legend of Zelda Ocarina of Time Walkthrough parte 33 Fire Temple parte 3 Megaton Hammer

    The Legend of Zelda Ocarina of Time Walkthrough parte 33 Fire Temple parte 3 Megaton Hammer

    Avowed update basically reinvents the fighter and ranger classes, while also adding new weapons and better Steam Deck optimization

    Avowed update basically reinvents the fighter and ranger classes, while also adding new weapons and better Steam Deck optimization

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    magical world part 10 || lost land 8

    The Legend of Zelda: LINK'S AWAKENING Intro Nintendo Switch Gameplay Walkthrough

    The Legend of Zelda: LINK'S AWAKENING Intro Nintendo Switch Gameplay Walkthrough

    Bungie says it’s ‘actively re-recording’ some voice lines for Destiny 2: The Edge of Fate after fans notice one of the game’s best-known heroes suddenly sounds like one of its most notorious villains

    Bungie says it’s ‘actively re-recording’ some voice lines for Destiny 2: The Edge of Fate after fans notice one of the game’s best-known heroes suddenly sounds like one of its most notorious villains

    Recital At Warbler's Nest Breath of the wild Find Kheel Quest

    Recital At Warbler's Nest Breath of the wild Find Kheel Quest

  • Retro Rewind
    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Games April 1995

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 57 April 1994

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: Blast from the Past – 35 Iconic Commercials of 1988!

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: PC World Magazine August 1998

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: Computer Shopper Magazine September 1997

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: PC Magazine December 2015

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: EDGE Magazine RETRO #1: The Guide to Classic Videogame Playing and Collecting

    Retro Rewind: Computer Gaming World Magazine Issue 73 December 1998

    Retro Rewind: Computer Gaming World Magazine Issue 73 December 1998

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

    Retro Rewind: Electronic Gaming Monthly Magazine Number 55 February 1994

  • Tech Art
    My 2024 Cozy Digital Art Desk Setup | iPad Accessories, Filming Gear & Digital Art Supplies

    My 2024 Cozy Digital Art Desk Setup | iPad Accessories, Filming Gear & Digital Art Supplies

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    Sun Sajna Kal Aaya Sapna Song Animation Editing | Flipaclip Digital Animation Editing

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    Sembang Seni # 2 – Seni Visual dan Augmented Reality : Peranginan Sri Perigi

    Dasha Taran – Vector Art Tutorial – Medibang Paint Android (Part 1 : Lineart)

    Dasha Taran – Vector Art Tutorial – Medibang Paint Android (Part 1 : Lineart)

    Create a VintageTag with Ephemera and Napkins! Mixed media Full #howto video step by step Shabby

    Create a VintageTag with Ephemera and Napkins! Mixed media Full #howto video step by step Shabby

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    Virtual Reality is Not What You Think

    MAJU TALK EPISODE # 2   I  Media and Art Industry Role in Pakistan

    MAJU TALK EPISODE # 2 I Media and Art Industry Role in Pakistan

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    Draw A Lotus Flower in Ms Paint | Kamal Kaa Phool Ms Paint Me Kaise Bnaye

    INSIDE Mirror Mirror: ArtScience Museum's NEW interactive exhibition

    INSIDE Mirror Mirror: ArtScience Museum's NEW interactive exhibition

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    Canon EOS R50 Mirrorless Camera RF-S18-45mm F4.5-6.3 is STM Lens Kit, 24.2 Megapixel…

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    LEGO Star Wars: The Force Awakens – Xbox 360 Standard Edition

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    Western Digital 10TB WD Purple Surveillance Internal Hard Drive HDD – SATA 6 Gb/s, 256…

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    NexStar 6G, 2.5” SATA III to USB 3.2 Gen1 External SSD/HDD Enclosure, ID: Black

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    Vansuny 64GB Type C Flash Drive 2 in 1 OTG USB 3.0 + USB C Memory Stick with Keychain…

  • Techs Got To Eat
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    Bacon & Spinach Mug Quiche: 3-Minute Gourmet Breakfast

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    Top 10 Vegetarian Recipes for 2025: Easy and Nutritious Meals for Busy People

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    Peanut Butter Banana Mug Muffin: 5-Minute Protein Snack

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    Oreo Mug Cake: 2-Minute Cookie & Cake Combo!

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    RYANSTAR RACING Black Car Door Handles Compatible with Tesla Cybertruck 2023 2024 2025 4…

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    Cyber Hooks Heavy Duty Steel L Track Cleat Hooks – 4PCS Set, OEM Style Compatible with…

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    New Series | UFOs: Investigating the Unknown | National Geographic MENA #shorts

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    Roswell Conspiracies: Aliens, Myths & Legends (Renewed)

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    New Alien Race Uncovered in Mysterious Tablets (Season 1) | Ancient Aliens: Origins

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    The Dark Truth About 23andMe

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How to Build Your Own Blockchain in 48 Hours: A Beginner’s Guide

Techcratic by Techcratic
May 26, 2025
in Techcratic ™
Reading Time: 6 mins read
125
A A
0

Blockchain technology is everywhere these days, from cryptocurrencies like Bitcoin to cutting-edge applications in healthcare and supply chains. But what exactly is a blockchain, and how does it work? More importantly, can you build one yourself—even if you’re a beginner?

The answer is yes! In this guide, we’ll walk you through the process of creating your own blockchain from scratch in just 48 hours. No prior experience? No problem! We’ll explain everything step by step, with simple examples and easy-to-follow instructions. By the end, you’ll have a working blockchain and a solid understanding of how this revolutionary technology works.

What is a Blockchain?

At its core, a blockchain is a digital ledger that records transactions in a secure and transparent way. Here’s how it works:

  • Blocks: A blockchain is made up of blocks, which are like pages in a ledger. Each block contains a list of transactions.
  • Hashes: Each block has a unique code called a hash, which acts like a fingerprint. It also includes the hash of the previous block, linking them together in a chain.
  • Decentralization: Instead of being stored in one place, the blockchain is copied across many computers (called nodes), making it secure and tamper-proof.

What You’ll Need

To build your blockchain, you’ll need:

  • A computer (Windows, Mac, or Linux).
  • Python installed (we’ll use Python because it’s beginner-friendly).
  • A code editor like VS Code.
  • Curiosity and a willingness to learn!

Step 1: Set Up Your Environment

First, let’s get your computer ready for coding:

  1. Download and install Python from python.org.
  2. Install a code editor like VS Code.
  3. Open your code editor and create a new file called blockchain.py.

Step 2: Create Your First Block

Let’s start by creating a simple block. Think of a block as a container that holds data (like transactions) and some metadata (like a timestamp).

Here’s the Python code to create a block:

import hashlib
import time

class Block:
    def __init__(self, index, previous_hash, data, timestamp):
        self.index = index
        self.previous_hash = previous_hash
        self.data = data
        self.timestamp = timestamp
        self.hash = self.calculate_hash()

    def calculate_hash(self):
        block_string = f"{self.index}{self.previous_hash}{self.data}{self.timestamp}"
        return hashlib.sha256(block_string.encode()).hexdigest()

# Create the first block (genesis block)
genesis_block = Block(0, "0", "Genesis Block", time.time())
print(f"Genesis Block Hash: {genesis_block.hash}")

What’s happening here?

  • We’re creating a Block class with properties like index, previous_hash, data, and timestamp.
  • The calculate_hash function generates a unique hash for the block using the SHA-256 algorithm.
  • We create the first block (called the genesis block) and print its hash.

Step 3: Build the Blockchain

Now that we have a block, let’s create a blockchain. A blockchain is essentially a list of blocks, where each block points to the previous one.

Here’s how to create a blockchain in Python:

class Blockchain:
    def __init__(self):
        self.chain = [self.create_genesis_block()]

    def create_genesis_block(self):
        return Block(0, "0", "Genesis Block", time.time())

    def get_latest_block(self):
        return self.chain[-1]

    def add_block(self, new_block):
        new_block.previous_hash = self.get_latest_block().hash
        new_block.hash = new_block.calculate_hash()
        self.chain.append(new_block)

# Create a blockchain and add a new block
my_blockchain = Blockchain()
my_blockchain.add_block(Block(1, "", "Block 1 Data", time.time()))
print(f"Block 1 Hash: {my_blockchain.chain[1].hash}")

What’s happening here?

  • We’re creating a Blockchain class that stores a list of blocks.
  • The add_block function links each new block to the previous one using hashes.
  • We add a second block to the blockchain and print its hash.

Step 4: Test Your Blockchain

Now that your blockchain is ready, let’s test it! Add a few more blocks and print the entire chain to see how it looks:

my_blockchain.add_block(Block(2, "", "Block 2 Data", time.time()))
my_blockchain.add_block(Block(3, "", "Block 3 Data", time.time()))

for block in my_blockchain.chain:
    print(f"Block {block.index} [Hash: {block.hash}, Previous Hash: {block.previous_hash}]")

Step 5: Explore Real-World Applications

Blockchains have many real-world applications, including:

  • Cryptocurrencies: Bitcoin and Ethereum use blockchains to record transactions.
  • Supply Chain Management: Track products from origin to consumer.
  • Healthcare: Securely store and share patient records.

Conclusion

Congratulations! You’ve just built your own blockchain from scratch. In just 48 hours, you’ve learned the basics of blockchain technology, created a functional blockchain, and explored its real-world applications. Whether you’re a beginner or an experienced developer, this project is a great way to deepen your understanding of this transformative technology. So, what’s next? Keep experimenting, adding features, and exploring the endless possibilities of blockchain!



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