Learn about crypto exchanges and wallets — Hinglish notes

2.3.10 · Stock-Market › Commodities, Forex & Crypto

Overview

Crypto exchanges aur wallets ek infrastructure layer banate hain jo digital assets ko khareedne, bechne, store karne, aur transfer karne mein help karta hai. Cryptocurrency markets ke saath interact karne se pehle, inki mechanics, security models, aur tradeoffs samajhna zaroori hai.

Figure — Learn about crypto exchanges and wallets

Core Concepts

Definition Crypto Exchange

Ek crypto exchange ek platform (centralized ya decentralized) hai jo cryptocurrencies ke liye buy aur sell orders ko match karta hai. Yeh provide karta hai:

Order book: Bids (buy orders) aur asks (sell orders) ki lists, alag-alag prices par
Liquidity: Trades execute karne ki ability bina price ko drastically move kiye
Price discovery: Supply-demand matching ke through asset value par market consensus Types:

Centralized Exchange (CEX): Company-operated platform (Coinbase, Binance, Kraken). Tum funds deposit karte ho, woh tumhare assets custody karte hain, tum unke order book par trade karte ho.
Decentralized Exchange (DEX): Smart-contract-based trading (Uniswap, PancakeSwap). Tum apna wallet connect karte ho, peer-to-peer ya liquidity pools ke through trade karte ho, custody tumhare paas rehti hai.

Definition Crypto Wallet

Ek crypto wallet software ya hardware hai jo tumhare private keys store karta hai aur tumhe blockchain networks ke saath interact karne deta hai. Yeh directly coins store nahi karta—coins blockchain par entries ke roop mein exist karte hain. Wallet store karta hai:

Private key: Secret number jo transactions sign karta hai (ownership prove karta hai)
Public key: Private key se derive hota hai, tumhara address generate karne ke kaam aata hai
Address: String (jaise "0x742d35...") jahan dusre tumhe crypto bhejte hain

Connectivity ke basis par types:

Hot wallet: Internet se connected (mobile app, browser extension, exchange account). Convenient hai lekin hacks ke liye vulnerable.
Cold wallet: Offline storage (hardware device, paper wallet). Secure hai lekin active trading ke liye less convenient. Custody ke basis par types:
Custodial: Third party (exchange) tumhari keys hold karta hai. Tum unpar trust karte ho ki woh funds lose/steal nahi karenge.
Non-custodial: Tum apni keys hold karte ho. Security aur backups ki responsibility tumhari hai.

Centralized Exchanges Kaise Kaam Karte Hain

Operational Model

Jab tum Coinbase jaisa CEX use karte ho:

Account Creation: KYC (Know Your Customer) verification—tum government ID, address proof se apni identity prove karte ho.
Deposit: Tum fiat (bank transfer, credit card) ya crypto (blockchain transfer) exchange ke omnibus wallet mein bhejte ho.
Internal Ledger: Exchange tumhara account credit karta hai. Tumhara balance ab unke off-chain database mein exist karta hai, on-chain nahi.
Trading: Tum orders place karte ho. Exchange tumhe counterparties ke saath instantly match karta hai kyunki yeh sab internal accounting hai—trades ke dauran koi blockchain transactions nahi hoti.
Withdrawal: Tum funds bahar bhejna request karte ho. Exchange unke wallet se tumhare personal wallet mein ek on-chain transaction broadcast karta hai.

Yeh model kyun?

Speed: Off-chain matching = millisecond execution, blockchain block confirmations ka intezaar nahi (Bitcoin ke liye 10 min, Ethereum ke liye 12 sec).
Complexity: Advanced order types (limit, stop-loss, margin, futures) ko traditional software mein implement karna smart contracts se aasaan hai.
Liquidity: Centralized order books buyers/sellers ko aggregate karte hain, bade trades ke liye better prices provide karte hain.

Tradeoffs:

Counterparty risk: Exchange bankruptcy (FTX 2022), hacks (Mt. Gox 2014), ya fraud matlab funds ka loss.
Custody: "Not your keys, not your coins"—tum exchange ki security aur solvency par trust kar rahe ho.
Censorship: Exchange tumhara account freeze kar sakta hai, withdrawals block kar sakta hai (government order, AML flags, terms-of-service violation).

Worked example CEX Trading Flow

Scenario: Tum Binance par $2,000/ETH mein 0.5 ETH khareedna chahte ho.

Step 1: Tumne pehle se bank transfer se $1, 200 d e p os i t k i y ah u ahai (t u mha r e B inan ce U S D ba l an ce m e in$ 1,200 dikhta hai).

Step 2: Tum 0.5 ETH ke liye market buy order place karte ho.

Binance ka matching engine best available sell orders dhundhta hai: Shayad 0.3 ETH at $2, 000, 0.2 E T H a t$ 2,001.
Market order kyun? Tum immediate execution chahte ho, current market price accept karte hue. Step 3: Binance instantly execute karta hai:
Tumhara USD balance debit hota hai: $1, 000.15 (0.3 \times$ 2,000 + 0.2× $2, 001 +$ 0.15 fee).
Tumhara ETH balance credit hota hai: 0.5 ETH.
Instant kyun? Koi blockchain involved nahi—sirf database updates.

Step 4: Tumhara 0.5 ETH Binance ke Ethereum wallet mein baithta hai (millions doosre users ke ETH ke saath). Unka internal ledger track karta hai ki 0.5 ETH tumhara hai.

Step 5: Baad mein, tum apne MetaMask wallet (0xYourAddress..) mein withdraw karte ho. Binance ek Ethereum transaction broadcast karta hai: unke wallet se transfer(0xYourAddress, 0.5 ETH). ~12 seconds baad (1 block confirmation), tum truly on-chain ETH ke malik ho.

Yeh kyun matter karta hai: Step 3 aur Step 5 ke beech, agar Binance hack ho jaye ya collapse kar jaye, tumhara ETH risk mein hai chahe tumhara account "show" karta ho 0.5 ETH.

Decentralized Exchanges Kaise Kaam Karte Hain

Operational Model (Automated Market Maker Example)

Uniswap jaisi DEXs order books ki jagah Automated Market Makers (AMMs) use karti hain:

Liquidity Pools: Users token pairs (jaise ETH aur USDC) ek smart contract mein deposit karte hain. Pool mein ab reserves $R_{E T H}$ aur $R_{U S D C}$ hain.
Constant Product Formula: AMM $R_{E T H} \times R_{U S D C} = k$ (constant) maintain karta hai.
Swap Execution: Tum USDC se ETH khareedna chahte ho. Tum USDC pool mein bhejte ho; yeh calculate karta hai ki tumhe kitna ETH dena hai taaki $k$ constant rahe (minus ek small fee).
Price Discovery: Price = reserves ka ratio. Jaise log ETH khareedते hain, $R_{E T H}$ ghatta hai aur $R_{U S D C}$ badhta hai, toh ETH ki price badhti hai.

Swap formula derive karna: Suppose pool mein token X ka $R_{x}$ aur token Y ka $R_{y}$ hai, $k = R_{x} \cdot R_{y}$ ke saath. Tum $Δ x$ token X bhejte ho. Tumhe token Y ka kitna $Δ y$ milega?

Swap ke baad: $(R_{x} + Δ x) (R_{y} - Δ y) = k = R_{x} R_{y}$

Expand karo: $R_x R_y - R_x \Delta y + \Delta x R_y - \Delta x \Delta y = R_x R_y$$$R_x R_y$ cancel karo aur $\Delta y$ ke liye solve karo:$ \Delta x R_y - R_x \Delta y - \Delta x \Delta y = 0\Delta y (R_x + \Delta x) = \Delta x R_y\Delta y = \frac{\Delta x \cdot R_y}{R_x + \Delta x}$$

Yeh form kyun? Jaise $Δ x$ badhta hai, denominator barhta hai, toh $Δ y$ slower badhta hai (bade trades ke liye worse price milti hai = slippage). Yahi tumhare trade ka price impact hai.

Fee $ϕ$ (jaise 0.3%) include karte hue, actual formula ban jaata hai: $Δ y = \frac{Δ x ( 1 - ϕ ) \cdot R _{y}}{R _{x} + Δ x ( 1 - ϕ )}$

AMMs kyun?

No order book: Smart contracts on-chain sorted order lists efficiently maintain nahi kar sakte (bahut gas-expensive hai). Constant product ek simple formula hai jo ek transaction mein executable hai.

Permissionless: Koi bhi pool create kar sakta hai ya liquidity add kar sakta hai; koi company gatekeeping nahi.

Always available: Jab tak blockchain chalti hai aur pool mein liquidity hai, tum 24/7 koi downtime nahi ke saath trade kar sakte ho.

Tradeoffs:

Slippage: Bade trades ko progressively worse prices milti hain. CEX par, ek bada order narrow price range mein fill ho sakta hai; DEX par, tum pool curve move kar rahe ho.

Gas fees: Har swap ek on-chain transaction hai. Congestion ke dauran Ethereum gas $5–$50+ cost kar sakta hai.

Impermanent loss: Agar tum liquidity provide karte ho aur prices diverge ho jaati hain, toh tumhare paas tokens hold karne se kam value ho sakti hai.

Smart contract risk: DEX code mein bugs ya exploits funds drain kar sakte hain.

[!example] DEX Swap Calculation Scenario: Uniswap ETH/USDC pool mein $R_{ETH} = 1000$ ETH, $R_{USDC} = 2, 000, 000$ USDC hai. Current price: $2,000/ETH. Tum 10,000 USDC se ETH swap karna chahte ho. Fee = 0.3%. Step 1: ETH received calculate karo (pehle bina fee ke, clarity ke liye): $Δ y_{E T H} = \frac{Δ x _{U S D C} \cdot R _{E T H}}{R _{U S D C} + Δ x _{U S D C}} = \frac{10 , 000 \cdot 1000}{2 , 000 , 000 + 10 , 000} = \frac{10 , 000 , 000}{2 , 010 , 000} \approx 4.975 ETH$ $(R_{U S D C} + Δ x)$ se divide kyun? Hum pool mein USDC add kar rahe hain, toh denominator badhta hai, ETH output ghatta hai.

Step 2: 0.3% fee include karo: $Δ x_{e f f ec t i v e} = 10, 000 \times 0.997 = 9, 970$ $Δ y_{E T H} = \frac{9 , 970 \cdot 1000}{2 , 000 + 9 , 970} \approx 4.963 ETH$

Step 3: Implied price: $Price = \frac{10 , 000}{4.963} \approx $2, 014.91/ ETH$ * $2, 000 sez y a d ak y u n ? * T u mha r e t r a d e n e p oo l m o v e k i y a . P e h l e :$ \frac{2{,}000{,}000}{1000} = 2000 $. B aa d m e in :$ \frac{2{,}010{,}000}{995.037} \approx 2020 $. T u mn e a p n e t r a d e k e im p a c t c u r v e m e in * * a v er a g e * * p r i ce p a y k i, j o$ 2,014.91 hai.

Slippage: $(2, 014.91 - 2, 000) /2, 000 \times 100% \approx 0.75%$ . Ek chhote trade ke liye, yeh tolerable hai; ek 100,000 USDC trade mein bahut zyada slippage hogi.

Common mistake Common Mistake: "DEX prices hamesha worse hoti hain"

Kyun sahi lagta hai: Tum DEXs par slippage dekhte ho lekin CEXs par instant fills, toh CEXs saste lagte hain.

Fix:

Chhote trades ke liye, CEXs mein often tighter spreads hote hain kyunki professional market makers order book mein compete karte hain.
Bade trades ke liye, CEX "price improvement" misleading ho sakta hai—tumhara market order order book par walk up kar sakta hai aur last trade price se worse prices pay kar sakta hai. Meanwhile, DEX slippage formula se transparent aur predictable hai.
Privacy/censorship premium: Kuch users KYC ya asset freezes se bachne ke liye thodi zyada DEX prices pay karte hain.
Total cost: CEX mein trading fees (0.1%–0.5%) + withdrawal fees + spread hain. DEX mein gas fees + swap fees (0.3%–1%) + slippage hain. Apne trade size ke liye full cost compare karna zaroori hai.

Wallet Security Model

Private Keys aur Seed Phrases

Tumhara wallet ek 12-word ya 24-word seed phrase display karta hai (jaise "witch collapse practice feed shame open despair creek road again ice least..."). Yeh phrase tumhara private key hi hai, words mein easier backup ke liye encode kiya gaya hai.

Derivation process (BIP39 standard):

Seed phrase → 512-bit seed (PBKDF2 hashing ke through)
Seed → Master private key (HMAC-SHA512 ke through)
Master key → Different accounts/addresses ke liye child keys (hierarchical deterministic derivation)

Kyun? Ek phrase Bitcoin, Ethereum, etc. ke liye infinite addresses generate kar sakta hai, ek deterministic sequence mein. Ek baar backup karo, sab kuch recover karo.

Security principles:

Seed phrase kabhi share mat karo: Koi bhi jiske paas yeh hai woh tumhara wallet recreate karke saare funds chura sakta hai. Koi legitimate service kabhi iske liye nahi poochegi.
Offline backup: Paper/metal par likho, safe ya bank deposit box mein rakho. Recovery ke alawa kabhi computer mein type mat karo.
Multi-sig wallets: Transactions sign karne ke liye $m$ of $n$ keys require karta hai (jaise 2-of-3). Single key compromise se protect karta hai. Institutions use karte hain.

Formula Address Generation (Ethereum Example)

Elliptic Curve Cryptography (secp256k1 curve):

Private key: Random 256-bit number $k$ (tumhara seed phrase ise deterministically generate karta hai).
Public key: Elliptic curve par point $P = k \cdot G$ , jahan $G$ generator point hai.

Elliptic curve: $y^{2} = x^{3} + 7$ (secp256k1 ke liye)
Point multiplication: $P = G + G \dots + G$ ( $k$ times)
Secure kyun? $P$ diya hua, $k$ dhundhna (discrete log problem) computationally infeasible hai.

Ethereum address: Public key ke Keccak-256 hash ke last 20 bytes, "0x" ke saath prepend kiya gaya.

$Address = 0x + last20bytes (Keccak256 (P))$ Transaction sign karna: Tum Bob ke address par 1 ETH bhejna chahte ho. Tum ek transaction message $m$ (to, amount, gas, nonce) create karte ho aur compute karte ho: $signature = ECDSA (k, hash (m))$

Signature $(r, s, v)$ prove karta hai ki tum $k$ possess karte ho bina ise reveal kiye. Miners tumhare public key se verify karte hain: $Verify (P, hash (m), signature) = ? True$

Yeh kyun matter karta hai: Tumhara private key kabhi wallet se bahar nahi jaata. Signature ownership ka sufficient proof hai. Agar kisi ko tumhara private key mil jaye, woh tumhare naam par koi bhi transaction sign kar sakta hai—funds irreversibly transfer kar sakta hai.

Worked example Hot vs. Cold Wallet Comparison

Scenario: Tumhare paas $50,000 worth of crypto hai. Hot Wallet Setup (MetaMask browser extension):

Advantages:
DEXs, NFT marketplaces, DeFi protocols se one-click connection.
Free hai (sirf download karo).
Use karna aasaan—password se transactions sign karta hai.
Risks:
Private key tumhare computer par encrypted store hoti hai. Malware ise potentially chura sakta hai.
Phishing sites tumhe malicious transactions sign karne ke liye trick kar sakti hain.
Real incident: User fake Uniswap link par click karta hai, ek token approval transaction sign karta hai. Attacker unka USDC balance drain kar deta hai.

Cold Wallet Setup (Ledger Nano X hardware wallet):

Advantages:
Private key kabhi hardware device se bahar nahi jaati. Chahe tumhare computer mein malware ho, key safe rehti hai.
Transactions ke liye device par physical button press required hota hai (confirm karta hai ki tum intentionally sign kar rahe ho).
Seed phrase backup offline stored hoti hai (tum 24 words paper par likhte ho).
Risks:
Cost: $150 device.
Inconvenience: Device plug in karna, buttons press karna, confirmation ka intezaar karna zaroori hai—slower workflow.
Physical security: Agar koi tumhara device AND PIN chura le, unhe access mil jaata hai (seed phrase se recover karne se pehle funds transfer karne ka time hai).

Recommended strategy:

Long-term holdings ke liye cold wallet (majority of funds).
Active trading ke liye hot wallet (sirf utna jo tum risk karne ke liye ready ho, jaise physical wallet mein cash rakhna vs. bank vault mein savings).
Exchange par ya hot wallet mein kabhi utne se zyada mat rakho jitna tum afford kar sako (counterparty risk aur hack risk).

Regulatory aur Practical Considerations

Centralized Exchanges par KYC/AML

KYC (Know Your Customer) aur AML (Anti-Money Laundering) regulations exchanges se require karte hain ki woh:

User identity verify karein (government ID, selfie, proof of address)
Suspicious patterns ke liye transactions monitor karein (large/rapid transfers, sanctioned entities se connections)
Regulators ko report karein (US mein FinCEN, UK mein FCA, etc.)

Exchanges yeh enforce kyun karte hain:

Legal compliance: KYC ke bina operate karna = exchange operators ke liye potential criminal charges.
Banking relationships: Exchanges ko fiat on/off ramps chahiye (banks ke saath partnerships). Banks AML compliance require karte hain.

Users ke liye implications:

Privacy tradeoff: Tumhare trades tumhari identity se linked hain, blockchain addresses ki pseudonymous nature ke unlike.
Jurisdictional risk: Exchange tumhare government ke orders comply karna padega (asset freezes, tax reporting).
DEX appeal: Non-custodial DEXs KYC require nahi karte kyunki woh kabhi funds custody nahi karte—tum directly apne wallet se trade karte ho.

Taxation

Zyaadatar jurisdictions mein (US, UK, India, EU), cryptocurrency tax purposes ke liye property hai (currency nahi):

Capital gains tax: Crypto bechna (kisi doosre crypto ke liye bhi) = taxable event. Agar tumne BTC $20 k p a r k ha r i d a,$ 40k par becha, tum $20k gain par tax owe karte ho.
Income tax: Crypto receive karna (mining rewards, staking, airdrops, salary) = fair market value par ordinary income.
Record-keeping burden: Tumhe har transaction ke liye cost basis aur date track karna hoga. Exchanges CSV exports provide karte hain; wallets nahi karte (tumhe Koinly, CoinTracker jaisi third-party tools chahiye).

Common mistake: Cryptos ke beech trading (BTC → ETH) "sale count nahi hoti". Galat—yeh BTC appreciation par capital gains trigger karta hai.

Common mistake Common Mistake: "Fiat mein withdraw na karke mein tax avoid kar sakta hoon"

Kyun sahi lagta hai: Agar mein sirf crypto-crypto trade karoon aur kabhi bank account touch na karoon, toh government track nahi kar sakti.

Fix:

Zyaadatar tax codes crypto-crypto ko taxable sale maante hain (ek property dispose karna doosri acquire karne ke liye). Jab tum 1 BTC ke liye 20 ETH swap karte ho, tum BTC apni current value par bech rahe ho.
Centralized exchanges tax authorities ko report karte hain (US mein IRS Form 1099-K). DEX trades public blockchains par hain—forensic tools (Chainalysis, Elliptic) addresses ko exchange accounts se link kar sakte hain jahan tumne KYC kiya hai.
Penalty risk: Pakde jaane par tax evasion charges. US mein, cryptocurrency report na karna IRS explicitly flag karta hai (Form 1040 par checkbox: "Did you receive, sell, send, or exchange any virtual currency?").
Better strategy: Tax-loss harvesting use karo (gains offset karne ke liye losers becho), long-term capital gains rate ke liye >1 saal hold karo (kam), cost basis diligently track karo.

Connections

Blockchain fundamentals — samajhna ki transactions kaise verify aur record hoti hain
Order book vs AM trading — exchange mechanism design mein deeper dive
DeFi protocols — wallets kaise lending, borrowing, yield farming ke saath interact karte hain
Cryptocurrency market structure — exchanges price discovery aur liquidity ko kaise affect karte hain
Digital asset custody solutions — institutional-grade multi-sig aur insurance options
Smart contract security — DeFi protocols se wallets connect karne ke risks
Tax accounting for crypto trades — cost basis methods ka detailed treatment (FIFO, LIFO, specific ID)

Active Recall Practice

Recall Ek 12-saal ke bachche ko explain karo

Imagine karo tumhare paas special video game coins (cryptocurrency) hain. Yeh coins khareedne ya bechne ke liye tumhe do cheezein chahiye:

Ek exchange (jaise ek store jahan log game coins trade karte hain). Kuch stores ek company run karti hai (centralized)—tum unhe apne coins hold karne dete ho, aur woh tumhe apne computers par super fast trade karne dete hain. Doosre stores zyaadatar ek vending machine jaisi hoti hain (decentralized)—tum apne wallet se directly doosre logon ke saath ek smart program mein automatic rules ke through trade karte ho. Koi company boss tumhara account close nahi kar sakta kyunki koi company hi nahi hai!
Ek wallet (tumhare coins ke liye ek backpack jaisa, lekin digital). Tumhare wallet mein ek secret password (private key) hota hai jo prove karta hai ki coins tumhare hain. Agar tum password paper par likhte ho aur kisi safe jagah chupaate ho, woh ek "cold wallet" hai (jaise khazana gaadhna). Agar tum ise apne phone par rakhte ho taaki tum kabhi bhi coins spend kar sako, woh ek "hot wallet" hai (use karna aasaan, lekin agar kisi ne tumhara phone hack kiya, woh password chura ke tumhare coins le sakta hai).

Zaroori rule: Agar tum apne coins company ke store mein rakhte ho, woh tumhari taraf se password hold kar rahe hain. Yeh aasaan hai, lekin agar store loot ho jaye ya bankrupt ho jaye, tum apne coins khoh dete ho. Agar tum vending-machine-style exchange use karte ho aur password apne khud ke backpack mein rakhte ho, tum control mein ho, lekin tumhe bhi bahut careful rehna hoga apna password khoye nahi—koi "forgot password" button nahi hai kyunki doosra koi ise jaanta hi nahi!

Mnemonics & Memory Aids

#flashcards/stock-market

Crypto exchanges ke do main types kya hain aur unka key tradeoff kya hai? :: Centralized exchanges (CEX) jaise Coinbase speed, liquidity, aur convenience offer karte hain lekin exchange par custody ke liye trust karna padta hai (counterparty risk). Decentralized exchanges (DEX) jaise Uniswap non-custodial trading aur censorship resistance offer karte hain lekin higher slippage, gas fees hain aur users ko apni keys manage karni padti hain.

Crypto wallets mein private key, public key, aur address mein kya difference hai?

Private key ek secret number hai jo transactions sign karta hai aur ownership prove karta hai. Public key mathematically private key se elliptic curve cryptography use karke derive hoti hai aur signatures verify karne ke kaam aati hai. Address public key ka ek shortened hash hai (jaise 0x123..) jo tumhara receiving address serve karta hai. Sirf private key funds spend kar sakti hai; ise kho dena matlab irreversible loss of access.

AMM-based DEXs mein constant product formula kaise kaam karta hai?

Uniswap jaisi AMM mein, liquidity pools k = R_x × R_y (constant) maintain karte hain. Jab tum Δx token X swap karte ho token Y ke liye, formula Δy = (Δx × R_y) / (R_x + Δx) determine karta hai ki tumhe kitna Y milega. Jaise tum ek token zyaada khareedते ho, uska reserve ghatta hai, har additional unit ko zyaada mehnga banaata hai (slippage cause karta hai).

Crypto mein "not your keys, not your coins" kyun important hai?

Jab tum centralized exchange par crypto hold karte ho, exchange private keys control karta hai, tum nahi. Tumhare paas IOU hai, blockchain par actual ownership nahi. Agar exchange hack ho jaye (Mt. Gox), bankrupt ho jaye (FTX), ya tumhara account freeze kare, tum apne funds access kho sakte ho. True ownership matlab hai us address se transactions sign karne wali private key possess karna jahan tumhare coins hain.

DEXs par slippage kya hai aur kyun hoti hai?

Slippage expected price aur executed price ke beech ka difference hai. AMM-based DEXs par, tumhara trade pool ka reserve ratio change karta hai (k = R_x × R_y se). Bade trades ek token zyaada remove karte hain, uski price progressively badhate hue. Example: ETH khareedna jab pool mein 1000 ETH hai, pehli bit

2000 p a r mi l s ak t ihai, l e k inaak h r ibi t

2020 par, averaging $2010 (0.5% slippage).

Seed phrase ka purpose kya hai aur ise secure kaise karna chahiye?

Ek seed phrase (12 ya 24 words) BIP39 standard use karke tumhara master private key encode karta hai. Yeh deterministically tumhare saare wallet addresses generate kar sakta hai. Security: paper/metal par likho, kabhi digitally nahi (koi photos, cloud storage, email nahi). Offline safe ya bank deposit box mein rakho. Kabhi kisi ke saath share mat karo—seed phrase ka possession = saare funds par full control.

Cryptocurrency mein capital gains tax kab trigger hota hai?

Crypto bechna fiat ke liye, ek crypto ko doosre se trade karna, ya crypto se goods/services khareedna zyaadatar jurisdictions mein taxable events hain (crypto ko currency ki jagah property treat karte hue). Har event mein capital gain/loss calculate karna padta hai: sale price minus cost basis. Holding tax trigger nahi karta; disposing karta hai. BTC ko ETH ke liye trade karna = BTC ko current value par bechna (taxable).

Custodial aur non-custodial wallets mein kya difference hai?

Custodial wallets (exchange accounts) = third party tumhare private keys hold karta hai, tum unpar trust karte ho. Use karna aasaan, email/phone se account recover kar sakte ho, lekin exchange hacks aur bankruptcy ke liye vulnerable. Non-custodial wallets (MetaMask, hardware wallets) = tum apni private keys hold karte ho, security aur backups ki responsibility tumhari hai. Koi counterparty risk nahi, lekin keys kho do = funds permanently kho jaate hain.

Centralized exchanges KYC kyun require karte hain?

KYC (Know Your Customer) zyaadatar jurisdictions mein legally required hai AML (Anti-Money Laundering) regulations comply karne ke liye. Exchanges ko fiat on/off ramps ke liye banking partnerships chahiye; banks AML compliance demand karte hain. Exchanges ko identity verify karni hoti hai, suspicious activity monitor karni hoti hai, aur financial regulators ko report karna hota hai. KYC ke bina operate karna criminal charges aur banking access kho jaane ka risk rakhta hai.

Liquidity provision mein impermanent loss kya hai?

Jab tum AMM pool mein liquidity provide karte ho (jaise ETH aur USDC equal value mein deposit karo), tum trading fees earn karte ho lekin impermanent loss face karte ho agar prices diverge ho jaayein. Agar ETH double ho jaye, pool rebalance ho jaata hai (tum uthne hi hold karne se kam ETH, zyaada USDC ke saath end karte ho). Loss "impermanent" hai kyunki yeh disappear ho jaata hai agar prices original ratio par return ho jaayein. Sirf tab realize hota hai jab tum liquidity withdraw karte ho.