Vikas Kumar

[Vikas Kumar @Vikaspd25116]

@NewspressX No

[Cockroaches of India @CJP_for_India]

Bilkul sir,
Paper chori pakdi gayi.

[Vikas Kumar @Vikaspd25116]

I’ve learned computer subjects from many places, but the kind of teaching and clarity that Rohit Negi sir provides is truly rare.
I’ve studied DSA, Frontend, Backend, and CN from him, and as a final-year student, I can confidently say that teachers like @rohit_negi9 are very few.

[Vikas Kumar @Vikaspd25116]

@rohit_negi9 @Krishna_925 Sir, try Greedy Algorithm taaki achha bike mile jisse jaldi makan dhundhna aasan hoga

[Vikas Kumar @Vikaspd25116]

Today I learned how URL shorteners work! 🔗
✅ How to generate short URLs using API
✅ What POST requests & body data mean
✅ Difference between 301 (permanent) & 302 (temporary) redirects
✅ Role of client-side caching
Excited to build my own version soon! 💻
#WebDev #APIs

[Vikas Kumar @Vikaspd25116]

🟢 Today’s Blockchain Learning

✅ Ethereum nonce = transaction counter to prevent replay attacks
✅ Smart contracts deploy bytecode, source code is for verification
✅ Validators risk 32 ETH stake (slashing for bad behavior)
✅ Slashed ETH = unrecoverable
#Ethereum #Blockchain

[Vikas Kumar @Vikaspd25116]

📝 Today’s Learning:
✅ Generated HD wallets for Ethereum, Bitcoin & Solana from a single mnemonic using BIP44 paths.
✅ Sent ETH via ethers.js + JSON RPC.
✅ Built & signed a raw Solana transaction with @solana/web3.js.
#Web3 #Crypto #blockchain

[Vikas Kumar @Vikaspd25116]

🚀 Just learned how apps like Instagram handle billions of users
From CDN, Load Balancer, Geo DNS, to caching, messaging queues & workers — it's all teamwork behind the scenes
📊 Swipe to see how big apps scale globally!
#SystemDesign #TechLearning #BackendDev #ScalableSystems

[Vikas Kumar @Vikaspd25116]

🔐 12-word wallet phrases use 2048-word list → 2¹²⁸ combos = unbreakable security 🤯
📉 Even supercomputers can’t brute-force it!
🧠 Learned Ethereum = programmable blockchain
📝 Built donation dApp with smart contracts
🎥 Next: Decentralized YouTube!
#Web3 #Blockchain

[Vikas Kumar @Vikaspd25116]

Today I learned the difference between WazirX & a real digital wallet.
WazirX holds their keys, not yours.
➡️ No private key = No real ownership.
A digital wallet (like Phantom) gives you full control via a seed phrase.
Next step: Move funds & take ownership! 🔐
#Crypto #Web3

[Vikas Kumar @Vikaspd25116]

🚀 Today I learned about:

✅ TCP vs UDP
✅ WebSocket vs WebRTC
✅ Client-Server & Peer-to-Peer networks
✅ Types of P2P & Application Layer Protocols
TCP = Reliable ordered
UDP = Fast, no guarantee
WebRTC = Peer video
WebSocket = Server chat
#Networking #WebDev

[Vikas Kumar @Vikaspd25116]

Today I learned how a Bitcoin transaction works:
UTXOs = chunks of unspent BTC.
You spend full UTXOs, get change back.k
Digital signatures prove ownership.ip
Miners verify & include transactions in blocks.
Wallets handle inputs, outputs & fees.s

#Bitcoin #BlockchainTechnology

[Vikas Kumar @Vikaspd25116]

Today I explored how blockchain ensures transaction authenticity 🔐.
➡️ Sender signs the transaction using their private key.
➡️ Network verifies it with the public key.
➡️ Receiver’s address is validated too.
Pure cryptography magic — no middleman needed! 🚀✨
#Blockchain #Web3

[Vikas Kumar @Vikaspd25116]

📢 Today’s #BlockchainLearning
Blockchain ledger = transaction history
Every block has previous hash, data & nonce
Miners find valid hash by changing nonce
10-min mining keeps chain secure & ahead
Longest valid chain is accepted
Work Done
#CryptoBasics #Bitcoin #Blockchain

[Vikas Kumar @Vikaspd25116]

Just had a deep dive into how our financial system evolved 📚💰
From barter to gold to USD domination, 2008 crisis, inflation, and currency manipulation.
Realized money isn’t just paper — it’s trust, power, and strategy!
Next: Blockchain’s role 🚀

[Vikas Kumar @Vikaspd25116]

#NewProfilePic