Crypto and blockchain terms, defined
Coins, chains, consensus, DeFi, NFTs and the Indian tax treatment. 35 terms with full definitions.
Three layers, and one Indian tax rule that overrides all of them
Crypto vocabulary stacks in layers. The infrastructure layer — blockchain, block, hash, node, consensus, proof of work, proof of stake, fork — describes how a distributed ledger reaches agreement without a central party. The asset layer — coin, token, stablecoin, altcoin, NFT — describes what is recorded on it. The application layer — DeFi, DEX, liquidity pool, yield farming, staking, smart contract — describes what is built on top.
For an Indian investor, one rule sits above all three and changes the arithmetic completely: gains on virtual digital assets are taxed at a flat rate with no deduction other than cost of acquisition, losses cannot be set off against other income or carried forward, and a tax is deducted at source on transfers above a threshold. That treatment is defined below and is the single most important term on this page for anyone actually transacting.
These definitions are explanatory, not a recommendation. Virtual digital assets are volatile, largely unregulated as investments in India, and carry custody risk that does not exist in a demat account.
35 crypto and blockchain terms, A to Z
Definitions are unabridged. The regulatory and tax position on virtual digital assets in India has changed repeatedly — verify the current rules before acting.
Airdrop
A crypto airdrop is the distribution of free tokens or coins to existing holders of a particular cryptocurrency or to wallets that have interacted with a protocol, as a way to reward early users, distribute governance tokens, bootstrap community, or raise awareness. Airdrops can be retroactive (rewarding past behaviour, as Uniswap did for all prior users in September 2020, distributing 400 UNI tokens worth ~$1,200 at launch) or prospective (requiring users to complete specific actions like following social media accounts or trading on a testnet). Retroactive airdrops to early protocol users have created some of the most significant “crypto for free” events in history. ENS airdropped tokens to .eth domain holders (some receiving $40,000+ in tokens), dYdX airdropped to traders (some receiving $100,000+), Arbitrum airdropped ARB tokens worth hundreds of millions to L2 users, and Blur airdropped to NFT traders on Ethereum. These events have created an entire sub-industry of “airdrop hunters” — users who systematically interact with new protocols across multiple wallets in hopes of qualifying for future airdrops. In India, airdrops are taxable events. The Income Tax Department’s position (though not formally clarified in all cases) is that airdrop income should be treated as “income from other sources” at slab rates when received, and any subsequent gain on sale is additionally taxable as VDA income at 30%. This double-taxation concern has led some Indian airdrop recipients to seek tax advice before claiming large airdrops.
Altcoin
Altcoin is a portmanteau of “alternative coin” — referring to any cryptocurrency other than Bitcoin. When Ethereum, Litecoin, and other early cryptocurrencies emerged as alternatives to Bitcoin, the term was coined. Today, there are over 20,000 altcoins listed on CoinMarketCap, ranging from blue-chip platforms like Ethereum (ETH) and Solana (SOL) to utility tokens, governance tokens, memecoins, and outright scams. Altcoins serve vastly different purposes: some are Layer 1 blockchains competing with Ethereum; others are DeFi protocol tokens granting governance rights; some power gaming ecosystems; and many are speculative instruments with no real utility. Altcoins are broadly categorised as: large-cap (>$10B market cap, e.g., ETH, BNB, SOL), mid-cap ($1B-$10B), small-cap ($100M-$1B), and micro-cap (<$100M). The crypto market is highly correlated — when Bitcoin falls, altcoins often fall harder; when Bitcoin rises, high-beta altcoins can 5-10x in value (this pattern is called “altcoin season”). The Bitcoin dominance index (BTC.D on TradingView) tracks Bitcoin’s share of total crypto market cap and is used as a signal: falling BTC.D often signals capital rotating into altcoins. In India, altcoins traded on CoinDCX, WazirX, and Zebpay are all subject to the same 30% VDA tax. The TDS and flat tax rate apply regardless of holding period, making altcoin trading significantly less tax-efficient than Indian equities where STCG is 20% and LTCG is 12.5%.
Bitcoin
Bitcoin is the world’s first decentralised digital currency, created in 2009 by the pseudonymous Satoshi Nakamoto. Unlike traditional fiat currencies issued by central banks, Bitcoin operates on a peer-to-peer network with no single point of control. Transactions are recorded on a public ledger called the blockchain, and the total supply is capped at 21 million coins — a deliberate design choice to make it deflationary by nature. Every approximately four years, the reward for mining new Bitcoin is halved (an event called the “halving”), reducing the rate at which new coins enter circulation. Bitcoin’s security comes from its Proof-of-Work consensus mechanism, where miners compete to solve complex cryptographic puzzles to validate transactions and add new blocks to the chain. This process is computationally expensive and energy-intensive, which is why Bitcoin has faced criticism for its carbon footprint. However, an increasing share of mining is now powered by renewable energy sources in countries like Iceland and Canada. In India, Bitcoin is classified as a Virtual Digital Asset (VDA) under the Finance Act 2022. Gains from Bitcoin trading are taxed at a flat 30% with no deduction for losses from other assets, and a 1% TDS applies on transactions above ₹10,000. Despite regulatory uncertainty, Bitcoin is widely traded on Indian exchanges like CoinDCX and WazirX and held as a hedge against currency depreciation.
Blockchain
A blockchain is a distributed, append-only ledger that records data across a network of computers in such a way that it is virtually impossible to alter historical records without the consensus of the majority of participants. Each “block” contains a set of validated transactions, a timestamp, and a cryptographic hash of the previous block — this chaining makes the ledger tamper-evident. Once data is written to the blockchain, it is replicated across thousands of nodes worldwide, eliminating the need for a central authority. The technology underlying Bitcoin, blockchain has since evolved far beyond currency. Ethereum introduced programmable blockchain with smart contracts — self-executing code that runs automatically when predefined conditions are met. This enabled decentralised applications (dApps) across finance, supply chain, healthcare, voting systems, and digital art. Public blockchains like Ethereum are open and permissionless; private blockchains like Hyperledger Fabric are used by enterprises that want the efficiency of shared ledgers without full public transparency. In India, the National Payments Corporation of India (NPCI) and RBI have explored blockchain for trade finance and cross-border payments. Several state governments have piloted blockchain-based land registry systems to reduce property fraud. Globally, JP Morgan’s Onyx platform and SWIFT’s experiments with blockchain highlight its growing institutional adoption.
CEX (Centralised Exchange)
A Centralised Exchange (CEX) is a traditional-style cryptocurrency trading platform operated by a company that acts as a trusted intermediary — holding users’ funds in custody, operating order books, providing liquidity, and handling fiat-to-crypto onramps and offramps. Major global CEXes include Binance, Coinbase, Kraken, and OKX. Indian CEXes include CoinDCX, WazirX, Zebpay, and CoinSwitch Kuber. CEXes typically require KYC (Know Your Customer) verification — submitting government ID, PAN, and proof of address — to comply with AML (Anti-Money Laundering) regulations. CEXes offer significant advantages: high liquidity (tight bid-ask spreads), fast transaction speeds (off-chain order matching), fiat rails (bank transfer, UPI in India), mobile apps with simple interfaces, customer support, and advanced trading features (futures, options, margin trading, stop-loss orders). They are the primary entry point for new crypto investors. However, CEXes require users to surrender custody of their funds — the exchange technically holds the private keys. This creates counterparty risk, as demonstrated by the collapse of FTX ($8B in user funds lost), Celsius ($4.7B), and Voyager, and the WazirX hack ($230M) in India in 2024. In India, CEXes must register with the Financial Intelligence Unit (FIU-IND) under PMLA rules, collect TDS on transactions above ₹10,000, and report suspicious transactions. Several exchanges — Binance, Kraken, OKX — received FIU show-cause notices in 2023-24 for operating without registration.
Crypto Regulation India
India’s approach to cryptocurrency regulation has evolved significantly from near-prohibition to cautious acceptance with taxation. In 2018, the Reserve Bank of India (RBI) issued a circular prohibiting banks from providing services to crypto businesses — effectively cutting off fiat-crypto channels. The Indian Supreme Court overturned this circular in March 2020, ruling it unconstitutional. This reopened banking channels for crypto exchanges and sparked a significant bull market in Indian crypto participation. The Finance Act 2022 introduced India’s first comprehensive crypto tax framework: a flat 30% tax on all Virtual Digital Asset (VDA) gains (the same rate as lottery winnings), with no deductions for losses against other income or other crypto assets. A 1% TDS (Tax Deducted at Source) was introduced on all crypto transfers above ₹10,000 (or ₹50,000 for specified persons). The framework explicitly includes cryptocurrencies, NFTs, and DeFi tokens. India does not allow crypto trading losses to be offset against salary, equity, or even other crypto gains — each token’s gains are taxed independently. In March 2023, India registered crypto exchanges as Reporting Entities under PMLA (Prevention of Money Laundering Act), requiring them to conduct KYC and report suspicious transactions to FIU-IND. The GIFT City International Financial Services Centre has been proposed as a regulated hub for crypto trading by foreign investors. India holds the G20 Presidency in 2023-24 and has actively shaped the global conversation on crypto regulation through the FSB (Financial Stability Board) framework.
Crypto Wallet
A crypto wallet is a software application or physical hardware device that stores the private keys needed to access and manage cryptocurrency holdings on a blockchain. Unlike a traditional bank account, a blockchain wallet does not “hold” coins — the coins always exist on the blockchain itself. The wallet stores the cryptographic keys that prove ownership and enable the signing of transactions. There are two fundamental types: hot wallets (connected to the internet) and cold wallets (offline), each with different security tradeoffs. Hot wallets include web wallets (MetaMask browser extension), mobile wallets (Trust Wallet, Phantom), and exchange custodial wallets (where the exchange holds your keys). They offer convenience but are vulnerable to phishing attacks, malware, and exchange hacks. Cold wallets include hardware wallets (Ledger, Trezor) — physical USB-like devices that store private keys offline — and paper wallets (printed private key). The crypto community axiom “not your keys, not your coins” warns against leaving funds on centralised exchanges indefinitely, as evidenced by the FTX collapse where users lost billions. A seed phrase (12-24 words) is the master backup of any non-custodial wallet. Anyone who gains access to your seed phrase gains full control of your funds permanently — there is no “forgot password” option. In India, hardware wallets are available on Amazon India (₹10,000-₹20,000 for a Ledger Nano X) and are strongly recommended for holdings above ₹5 lakh.
DAO (Decentralised Autonomous Organisation)
A Decentralised Autonomous Organisation (DAO) is an organisational structure governed by smart contracts and token-holder voting rather than traditional management hierarchies or legal entities. DAOs enable groups of people distributed globally to coordinate resources, make collective decisions, and manage shared treasuries without centralised control. Token holders propose and vote on protocol changes, grant funding, strategic partnerships, and treasury management — typically one token equalling one vote (though quadratic voting and reputation-based systems also exist). The first notable DAO was “The DAO” — an Ethereum-based venture fund launched in 2016 that raised $150 million in ETH. A vulnerability in its smart contract was exploited, leading to the loss of $60 million and ultimately the controversial Ethereum hard fork that created Ethereum Classic. Since then, DAOs have matured significantly. MakerDAO governs the DAI stablecoin protocol; Uniswap DAO controls its $2B+ treasury; Compound DAO manages lending parameters. Protocol DAOs, investment DAOs (Flamingo DAO buying NFTs), grant DAOs (Gitcoin), and social DAOs (Friends With Benefits) each represent different models. Challenges for DAOs include voter apathy (most token holders don’t vote), plutocratic voting where large token holders (whales) dominate, legal uncertainty (most jurisdictions don’t recognise DAOs as legal entities), and the technical complexity of on-chain governance. Wyoming became the first US state to legally recognise DAOs as LLCs in 2021, a development being watched by Indian legal practitioners.
DCA (Dollar Cost Averaging)
Dollar Cost Averaging (DCA) is an investment strategy where an investor allocates a fixed sum of money at regular intervals (weekly, monthly) into an asset regardless of its price, rather than trying to time the market with a lump sum investment. In crypto, DCA is widely advocated as a way to reduce the impact of extreme volatility on the entry price. By consistently buying at different price points, the investor averages out their cost basis over time — buying more units when prices are low and fewer when prices are high. The mathematical power of DCA in a volatile asset like Bitcoin is significant. Backtesting shows that any 4-year DCA strategy in Bitcoin since its launch has been profitable, even if started at market peaks (like December 2017 or November 2021). DCA removes the psychological burden of timing decisions and counteracts behavioural biases like FOMO (buying at peaks) and FUD (panic selling at bottoms). It is also the most practical approach for salaried investors who invest from regular income rather than a lump sum corpus. In India, several crypto exchanges offer automatic DCA features (called “Recurring Buy” or “SIP” in crypto context): CoinDCX’s CoinDCX Go app, WazirX’s WRX token staking plan, and third-party tools like Mudrex allow users to set up weekly or monthly Bitcoin/ETH purchases automatically. The 1% TDS applies on each individual DCA purchase, which must be tracked for tax purposes.
Decentralised Exchange (DEX)
A decentralised exchange (DEX) is a peer-to-peer marketplace that allows users to trade cryptocurrencies directly from their wallets without the need for a centralised intermediary (like Binance or Coinbase). DEXes operate through smart contracts on-chain, with trades executed automatically by the protocol’s code. The first generation of DEXes used order books (similar to traditional exchanges), but the breakthrough came with Automated Market Makers (AMMs) — Uniswap v1 in 2018 and the explosion of AMM-based DEXes in 2020’s DeFi Summer. DEXes offer several advantages over centralised exchanges (CEXes): no KYC requirements, self-custody (users maintain control of private keys throughout), access to long-tail tokens that aren’t listed on CEXes, censorship resistance, and no risk of exchange insolvency. Uniswap (Ethereum), PancakeSwap (BNB Chain), Raydium (Solana), and Curve Finance (stablecoins) are among the most prominent DEXes. Aggregators like 1inch and ParaSwap route trades across multiple DEXes to find the best price. Disadvantages include: higher gas fees than CEX trades, slippage risk (especially for large orders or illiquid pairs), the complexity of managing wallets and approvals, and vulnerability to MEV (Miner Extractable Value) attacks where bots front-run trades by paying higher gas fees. In India, DEX trades are still subject to the 30% VDA tax and 1% TDS, though enforcing TDS on decentralised on-chain swaps remains a regulatory challenge.
DeFi (Decentralised Finance)
Decentralised Finance, or DeFi, refers to a suite of financial services — lending, borrowing, trading, earning yield, insurance, and derivatives — built on public blockchains (primarily Ethereum) using smart contracts, without any central authority like a bank or exchange. DeFi protocols operate 24/7, are accessible to anyone with an internet connection and a crypto wallet, and execute transactions automatically based on code rather than human intermediaries. The movement emerged prominently in 2020, during the “DeFi Summer,” when Total Value Locked (TVL) in DeFi protocols grew from $1 billion to over $15 billion within months. Core DeFi primitives include: Automated Market Makers (AMMs) like Uniswap, which enable token swaps through liquidity pools instead of order books; lending protocols like Aave and Compound, where users earn interest by supplying assets or take over-collateralised loans; yield aggregators like Yearn Finance, which automatically move funds between protocols to maximise returns; and decentralised stablecoins like DAI, which maintain their peg through algorithmic mechanisms and crypto collateral. However, DeFi carries significant risks: smart contract bugs (multiple protocols have lost hundreds of millions to hacks), oracle manipulation, impermanent loss for liquidity providers, and regulatory uncertainty. In India, DeFi gains are taxed under the 30% VDA tax rate with 1% TDS, making frequent DeFi interactions very tax-inefficient.
Ethereum
Ethereum is a decentralised, open-source blockchain platform launched in 2015 by Vitalik Buterin and co-founders. While Bitcoin was designed primarily as digital money, Ethereum was built as a programmable blockchain — a global computer on which developers can deploy smart contracts and decentralised applications (dApps). Its native currency, Ether (ETH), is used to pay for computation on the network (called “gas fees”) and is the second-largest cryptocurrency by market capitalisation. In September 2022, Ethereum completed “The Merge” — one of the most significant technical upgrades in crypto history — transitioning from Proof-of-Work (PoW) mining to Proof-of-Stake (PoS) validation. This reduced Ethereum’s energy consumption by approximately 99.95% and made ETH a deflationary asset under high-usage conditions, since a portion of gas fees is now burned. Validators must stake 32 ETH to participate in block production and earn rewards, rather than expending electricity. Ethereum hosts the majority of DeFi protocols, NFT marketplaces, and Web3 projects. Its ERC-20 token standard underpins thousands of altcoins and stablecoins. Layer 2 scaling solutions like Arbitrum, Optimism, and Polygon were built on top of Ethereum to address its high transaction fees and limited throughput of ~15 transactions per second (TPS). In India, developers building on Ethereum pay gas fees in ETH regardless of INR/USD fluctuations.
Flash Loan
A flash loan is an uncollateralised loan available from DeFi lending protocols (primarily Aave) that must be borrowed and repaid within a single Ethereum transaction block. If the loan is not repaid by the end of the transaction, the entire operation reverts as if it never happened — the blockchain’s atomicity guarantee makes this possible without traditional credit risk. Flash loans enable anyone to borrow millions of dollars worth of crypto with zero collateral, use the funds within the same transaction, and return them — with a small fee (typically 0.09% on Aave) — all in one atomic operation. Legitimate use cases for flash loans include: arbitrage (borrowing to exploit price differences between exchanges, repaying within the same block), collateral swaps (replacing one form of collateral with another without fully unwinding a position), self-liquidation (closing an overleveraged position without needing additional capital), and liquidating undercollateralised positions for profit. Flash loans are theoretically available to anyone — they require programming skills to execute, typically through a smart contract deploying the loan and the strategy atomically. The dark side of flash loans is their use in protocol attacks. Over 50 DeFi hacks have involved flash loans as the attack vector — borrowing huge sums to manipulate oracle price feeds, drain protocol treasuries, or exploit governance vulnerabilities. The Beanstalk hack ($182M) and Euler Finance hack ($197M) both used flash loans as part of complex exploit sequences.
FOMO
FOMO — Fear Of Missing Out — is the anxiety that arises when investors see others profiting from a rapidly rising asset and rush to buy in, often at inflated prices near market tops. In financial markets, FOMO is a well-documented behavioural phenomenon that leads to irrational decision-making: abandoning research, ignoring risk, investing borrowed money, and buying purely because of social proof (“everyone is making money”). In crypto markets, FOMO is amplified by 24/7 trading, social media echo chambers, and the extraordinary speed of price movements. FOMO buying typically accelerates near market peaks. During parabolic bull markets, social media (Twitter, Telegram groups, YouTube channels) creates a relentless signal of success — screenshots of 10x gains, Lamborghini purchases, stories of life-changing wealth. The FOMO buyer enters near the top, holds through the crash (hoping for recovery), and either sells at a loss or holds indefinitely through a prolonged bear market. Research consistently shows that retail crypto buyers on average buy near tops and sell near bottoms — the exact opposite of optimal strategy. Countering FOMO requires discipline: having a pre-defined investment strategy (DCA), setting price alerts rather than watching charts obsessively, and recognising that missing one opportunity does not mean all opportunities are lost. The best opportunities typically present themselves during periods of maximum fear (FUD), not maximum greed (FOMO).
FUD
FUD stands for Fear, Uncertainty, and Doubt — a communication strategy involving the spread of negative, misleading, or exaggerated information about a cryptocurrency, project, or the broader market to create panic selling among retail investors. The term predates crypto (it was used in the tech industry to describe Microsoft’s competitive tactics against Linux) but has become ubiquitous in crypto culture. FUD can be genuine warnings about real risks, coordinated misinformation campaigns by short-sellers, or reactions to unfavourable news. Common sources of crypto FUD include: government regulatory crackdowns (China banning crypto multiple times, India’s proposed “Cryptocurrency and Regulation of Official Digital Currency Bill”), environmental concerns about Bitcoin’s energy use, security exploits at major protocols, exchange collapses (FTX, Celsius, BlockFi), and mainstream media coverage focusing on scams and speculation. Short-sellers who have taken bearish positions in crypto derivatives benefit from FUD that drives prices down, creating financial incentives to amplify negative narratives. Distinguishing legitimate concern from manufactured FUD is a critical skill for crypto investors. Legitimate red flags (protocol exploit, insider selling, regulatory enforcement) warrant action; coordinated social media panic often represents a buying opportunity for long-term believers. In India, RBI’s repeated warnings about crypto risks — calling it “Ponzi-like” — constituted FUD to crypto enthusiasts but genuine fiduciary guidance to the general public.
Gas Fee
Gas fees are the transaction costs paid by users to compensate Ethereum (and other EVM-compatible) network validators for the computational resources required to process and validate transactions. The term “gas” is a metaphor: just as a car requires petrol/gas to run, the Ethereum network requires gas to execute any operation — from simple ETH transfers to complex multi-step DeFi interactions. Gas is measured in units called “gwei” (1 gwei = 0.000000001 ETH). The total fee paid = Gas Units Used × Gas Price Per Unit. Ethereum’s EIP-1559 upgrade (August 2021) transformed the fee market. It introduced a “base fee” that is algorithmically set by the network based on demand and is burned (destroyed) with each transaction, plus an optional “priority fee” (tip) paid to the validator who includes the transaction. High network congestion — during NFT drops, DeFi liquidation cascades, or major market events — causes base fees to spike dramatically. During the peak of NFT minting in 2021, gas fees regularly exceeded $200-500 per transaction, making small transactions economically unviable on Ethereum mainnet. Layer 2 solutions (Arbitrum, Optimism, Base, Polygon) batch thousands of transactions off-chain and post compressed summaries to Ethereum, reducing gas costs by 10-100x. Ethereum’s “Dencun” upgrade in March 2024 introduced “blobs” (EIP-4844), dramatically reducing L2 transaction costs to under $0.01. In India, understanding gas fee dynamics is crucial for timing DeFi transactions efficiently.
Halving
The Bitcoin halving is a programmed event hardcoded into the Bitcoin protocol that cuts the block reward paid to miners by exactly 50% every 210,000 blocks (approximately every four years). At Bitcoin’s launch in 2009, the block reward was 50 BTC per block. After the first halving in 2012, it dropped to 25 BTC; then 12.5 BTC in 2016; 6.25 BTC in 2020; and 3.125 BTC after the fourth halving in April 2024. The total supply of Bitcoin is permanently capped at 21 million coins — the final Bitcoin is estimated to be mined around 2140. The halving has historically been one of the most significant catalysts in Bitcoin’s price cycle. By reducing the rate of new supply issuance, the halving tightens supply at a time when demand (driven by institutional adoption, macroeconomic uncertainty, and retail interest) continues to grow. Each of the first three halvings was followed within 12-18 months by a major Bitcoin bull run: 2013 (100x), 2017 ($20,000 ATH), and 2021 ($69,000 ATH). This pattern has led to the popular “Stock-to-Flow” (S2F) model for Bitcoin price prediction, though the model’s predictive accuracy is debated. After all Bitcoin is mined, miners will rely solely on transaction fees to secure the network. Critics worry that fee revenue alone may be insufficient — this is known as the “security budget” problem. Bitcoin advocates counter that a much higher BTC price and significant transaction volume will ensure adequate miner compensation.
HODL
HODL originated as a typo in a 2013 Bitcoin Talk forum post where a user wrote “I AM HODLING” instead of “I AM HOLDING” during a market crash. The term took on a life of its own and became a core piece of crypto culture, later given a backronym: “Hold On for Dear Life.” HODLing is an investment strategy of holding crypto assets through extreme volatility without selling, based on the conviction that long-term appreciation outweighs short-term pain. It is the crypto equivalent of Warren Buffett’s “buy and hold” philosophy. The HODL strategy has been extraordinarily effective for Bitcoin and Ethereum over multi-year timeframes — Bitcoin’s average annual return since inception is approximately 150%. However, HODLing altcoins has been disastrous for many investors, as the majority of projects from the 2017 and 2021 bull markets never recovered and eventually went to zero. The difference between disciplined HODLing of blue-chip crypto assets and holding speculative altcoins is critical. Long-term HODLers (“LTH” in on-chain analytics) are distinguished from short-term holders (“STH”) — both groups’ behaviour provides insights into market cycles. From a tax perspective in India, HODLing has no tax advantage — gains are taxed at the same flat 30% regardless of holding period (unlike equities where >1 year qualifies for 12.5% LTCG). This removes the typical tax incentive for long-term holding that exists in most other asset classes.
Impermanent Loss
Impermanent loss (IL) is the reduction in value experienced by liquidity providers in an AMM-based DeFi protocol compared to simply holding the same assets in a wallet. It occurs because AMMs algorithmically rebalance pools to maintain a target ratio (e.g., 50/50 by value), which means they automatically sell the token that is appreciating and buy the token that is depreciating — the opposite of what a rational holder would want to do. The “impermanent” qualifier means the loss is unrealised as long as the LP remains in the pool and could theoretically recover if prices revert to their original ratio. The magnitude of IL depends on how much the price ratio of the two pooled tokens diverges: a 1.25x price change results in 0.6% IL; 2x results in 5.7% IL; 5x results in 25.5% IL. For volatile asset pairs (like ETH/MEME tokens), IL can easily exceed trading fee income, making LP provision economically irrational. This is why Curve Finance focuses on stablecoin-to-stablecoin pools where price ratios remain near 1:1 — minimising IL while earning fees on high-volume stablecoin swaps. LPs in volatile pools need to ensure that accrued trading fees exceed IL to profit. Concentrated liquidity providers on Uniswap v3 face amplified IL when prices exit their chosen range. Some protocols offer IL insurance (like Bancor v2.1 had for a period) or single-sided staking to shield LPs, but most still require LPs to fully understand and accept this risk.
Layer 2
Layer 2 (L2) refers to secondary blockchain networks built on top of a base blockchain (Layer 1, typically Ethereum) that process transactions off-chain and periodically settle compressed transaction summaries to the main chain. L2 solutions address the “blockchain trilemma” — the difficulty of simultaneously achieving security, scalability, and decentralisation. By moving computation off-chain while inheriting Ethereum’s security for final settlement, L2 networks can achieve thousands of transactions per second (vs. Ethereum’s ~15 TPS) at a fraction of the cost. The two dominant L2 paradigms are Optimistic Rollups and ZK (Zero-Knowledge) Rollups. Optimistic Rollups (Arbitrum, Optimism, Base) assume transactions are valid by default and use a “fraud proof” challenge period (7 days) for dispute resolution. ZK Rollups (zkSync, StarkNet, Polygon zkEVM) use cryptographic validity proofs to immediately prove the correctness of transactions — no challenge period needed, enabling faster withdrawals. ZK-Rollups are considered the long-term superior solution due to faster finality and stronger cryptographic guarantees but are harder to develop. Polygon is the most widely used Ethereum scaling solution, processing over 3 million transactions per day. Built by Indian co-founders Sandeep Nailwal, Jaynti Kanani, and Anurag Arjun, Polygon has become the infrastructure of choice for major brands (Disney, Starbucks, Reddit) implementing Web3 features. The MATIC token (rebranding to POL) powers the Polygon ecosystem.
Liquidity Pool
A liquidity pool is a smart contract that holds reserves of two or more tokens, enabling decentralised trading on Automated Market Makers (AMMs) like Uniswap, PancakeSwap, or Curve Finance — without the need for a traditional order book or a market maker. Users called Liquidity Providers (LPs) deposit equal values of two tokens (e.g., ETH and USDC) into a pool and receive LP tokens representing their share. The AMM’s pricing algorithm (typically x*y=k, the constant product formula) automatically adjusts prices as trades occur, maintaining the pool’s balance. LPs earn fees from every trade executed against their pool — typically 0.30% on Uniswap v2, split proportionally among all LPs. On Uniswap v3, LPs can concentrate their liquidity within custom price ranges, earning significantly higher fees when the price trades within their range but earning nothing when it trades outside. This “concentrated liquidity” concept introduced capital efficiency but added complexity. Curve Finance specialises in stablecoin pools where prices should stay near 1:1, allowing extremely low slippage for stablecoin swaps. The key risk for LPs is “impermanent loss” — the divergence in value between holding assets in a pool versus simply holding them in a wallet. When one token’s price moves significantly relative to the other, the AMM rebalances by selling the appreciating asset and buying the depreciating one, leaving LPs with less of the outperforming token. Impermanent loss becomes “permanent” when the LP withdraws funds before prices revert.
Memecoin
A memecoin is a cryptocurrency that originated from an internet meme or has no serious technological purpose, deriving its value almost entirely from community sentiment, social media hype, and speculative trading. Dogecoin (DOGE), created in 2013 as a joke based on the “Doge” meme, was the first famous memecoin. It attracted a passionate community and institutional attention — particularly from Elon Musk’s tweets — making it one of the top 10 cryptocurrencies by market cap at its peak. Shiba Inu (SHIB) followed in 2020, branding itself as the “Dogecoin killer.” The memecoin market is extremely high risk. Projects launch with no whitepapers, no development roadmaps, and anonymous teams. They rely purely on viral marketing and community momentum. The launch of memecoins has become industrialised on platforms like pump.fun (Solana), where hundreds of new memecoins launch every day, most going to zero within hours. The occasional coin — like Pepe (PEPE) or WIF (dogwifhat) — captures cultural momentum and generates extraordinary short-term returns, creating survivorship bias that attracts more retail speculation. In India, memecoin trading attracted significant retail interest during the 2021 bull market. Despite the 30% flat tax and 1% TDS, trading volumes on Indian exchanges for DOGE and SHIB were substantial. The key danger is that memecoins are zero-sum games: early buyers profit at the expense of later buyers, and most participants lose money overall.
NFT (Non-Fungible Token)
A Non-Fungible Token (NFT) is a unique cryptographic token on a blockchain that represents ownership of a specific digital or physical asset — artwork, music, collectibles, virtual real estate, gaming items, or event tickets. Unlike fungible tokens such as Bitcoin or Ether (where one unit is interchangeable with another), each NFT has a unique token ID and metadata that makes it one-of-a-kind or part of a limited edition. NFTs are typically built on the ERC-721 or ERC-1155 standards on Ethereum, though they also exist on Solana, Polygon, and other chains. NFTs surged into mainstream awareness in 2021, with artist Beeple selling a digital collage for $69 million at Christie’s, and NBA Top Shot selling over $700 million worth of “moments” (video highlights packaged as NFTs). The underlying value proposition of NFTs is proof of ownership and authenticity on a public, verifiable ledger. Creators can embed royalty logic in the smart contract, earning a percentage (typically 5-10%) on every future secondary sale — a revolutionary model for artists who previously earned nothing from resales. Critics argue that NFTs lack intrinsic value, are susceptible to wash trading (artificially inflating volumes by trading with oneself), and the 2022 “crypto winter” saw the NFT market collapse by over 95% from peak valuations. In India, NFT transactions are subject to 30% tax on gains and 1% TDS, making the ecosystem particularly tax-heavy for frequent traders.
Proof of Stake
Proof of Stake (PoS) is a blockchain consensus mechanism that selects validators to create new blocks based on the amount of cryptocurrency they “stake” (lock up as collateral) rather than computational work. Introduced as a more energy-efficient alternative to Proof of Work, PoS was popularised by Ethereum’s “The Merge” in September 2022 and is also used by Cardano, Solana, Avalanche, and many other blockchains. Validators are chosen pseudo-randomly, with higher stakes increasing the probability of selection. In Ethereum’s PoS, validators must deposit 32 ETH (~₹20 lakh at 2024 prices) as collateral. If a validator behaves honestly, they earn staking rewards (~4-6% APY). If they attempt to double-sign or act maliciously, a portion of their staked ETH is “slashed” (permanently destroyed), creating a strong financial disincentive for dishonesty. This replaces the energy cost of PoW with economic stake as the security mechanism. Liquid staking protocols like Lido allow users to stake any amount of ETH and receive a liquid “stETH” token representing their staked position. Critics of PoS argue that it favours the wealthy (“the rich get richer”), that large validator pools could centralise power, and that it lacks the physical-world anchoring that PoW’s energy cost provides. Ethereum’s transition reduced energy consumption by ~99.95% and made ETH deflationary during high-usage periods, as a portion of every gas fee is burned under EIP-1559.
Proof of Work
Proof of Work (PoW) is the original blockchain consensus mechanism used by Bitcoin, introduced by Satoshi Nakamoto in 2008. In a PoW system, network participants called “miners” compete to solve a computationally intensive mathematical puzzle — specifically, finding a hash output that is below a certain target value (called “difficulty”). The miner who first finds a valid solution broadcasts the new block to the network and receives a block reward (currently 3.125 BTC after the April 2024 halving) plus all transaction fees in that block. The “work” in Proof of Work is the computational effort and electricity expended in solving the puzzle. This work serves as economic security — to rewrite blockchain history, an attacker would need to redo all the computational work of all subsequent blocks while outpacing the honest network in real time. For Bitcoin’s network, achieving a 51% attack would require controlling over 600 exahashes per second of computing power, costing billions of dollars in hardware and electricity. This makes Bitcoin’s blockchain among the most secure databases ever created. The major criticism of PoW is its energy consumption. Bitcoin currently consumes approximately 120 TWh of electricity per year — comparable to Argentina’s annual consumption. This drove the development of alternative consensus mechanisms, most notably Proof of Stake. However, proponents argue that PoW’s energy use secures the most valuable permissionless monetary network in history and that a growing percentage (now over 50%) is sourced from renewables.
Rug Pull
A rug pull is a type of crypto exit scam where the developers of a project — typically a new DeFi protocol, NFT collection, or token — suddenly withdraw all liquidity or funds from the project and disappear, leaving investors with worthless tokens. The name derives from the idiom “pulling the rug out from under someone.” Rug pulls are one of the most common forms of crypto fraud, particularly on permissionless DEXes where anyone can list a token without any vetting. They account for a significant portion of the $7+ billion lost to crypto scams annually. Hard rug pulls involve a backdoor in the smart contract code that allows developers to mint unlimited tokens, disable selling (the “honeypot” trap), or directly withdraw locked liquidity. Soft rug pulls are less clearly illegal — developers may simply dump their own token allocation (“insider selling”), abandon the project, and stop development, gradually eroding investor confidence and price. Red flags to watch for include: anonymous teams, unaudited contracts, liquidity not locked or vested, promises of extraordinarily high APY, copycat code from other projects, and sudden social media promotion campaigns. In India, crypto fraud victims have limited legal recourse since crypto is not yet comprehensively regulated. The CBI and ED have investigated some cases under existing financial fraud laws. Several Indian-linked projects have been implicated in international rug pulls, damaging retail investors across Asia.
Seed Phrase
A seed phrase (also called a recovery phrase or mnemonic phrase) is a human-readable representation of the root private key of a cryptocurrency wallet — typically 12 or 24 randomly generated English words from the BIP-39 wordlist (2,048 words). The seed phrase is used to generate all private and public keys for every cryptocurrency address within that wallet. It is the master backup: anyone who possesses the seed phrase can restore the wallet on any compatible device and has full, irrevocable access to all funds within it. The security implications of the seed phrase cannot be overstated. It must never be stored digitally — not in email, cloud storage, photos, or screenshots — as any digital storage can be compromised through phishing, malware, or service breaches. Best practice dictates writing the seed phrase on paper or engraving it on fireproof metal (products like Cryptosteel or Bilodil Metalplate), storing it in a secure location (bank vault or fireproof safe), and never sharing it with any person or entering it into any website. Hardware wallet manufacturers (Ledger, Trezor) and non-custodial wallet apps (MetaMask, Trust Wallet) all use BIP-39 seed phrases as the universal backup standard. In India, there have been several reported cases of crypto theft via seed phrase phishing — fraudsters posing as wallet support teams requesting seed phrases to “verify” accounts. SEBI and RBI have both issued advisories warning about such scams.
Smart Contract
A smart contract is a self-executing program stored on a blockchain that automatically enforces and executes the terms of an agreement when predefined conditions are met — without requiring a trusted third party like a lawyer, bank, or notary. The concept was first proposed by cryptographer Nick Szabo in 1994 and practically implemented on Ethereum in 2015. Smart contracts are written in programming languages like Solidity (Ethereum), Rust (Solana), or Move (Aptos) and are immutable once deployed — their code cannot be changed, only upgraded through proxy patterns. Smart contracts enable trustless, transparent, and censorship-resistant execution of complex business logic. A DeFi lending protocol uses smart contracts to automatically liquidate collateral if a borrower’s health factor drops below 1. An NFT marketplace uses them to automatically route royalties to creators on every secondary sale. Insurance protocols use smart contracts to pay claims without human claims assessors — a flight delay oracle triggers a payout if verified flight data confirms a delay of over 3 hours. Limitations include the “oracle problem” — blockchains cannot natively access real-world data, so they rely on oracle networks like Chainlink to feed in external information. Smart contract bugs have led to hundreds of millions in losses. The infamous DAO hack of 2016 drained $60 million in ETH through a reentrancy vulnerability. Auditing by firms like OpenZeppelin and Trail of Bits is considered essential before production deployment.
Stablecoin
A stablecoin is a type of cryptocurrency designed to maintain a stable value relative to a reference asset — typically the US dollar (USD), though some are pegged to gold or other currencies. Stablecoins solve the fundamental problem of crypto’s volatility for everyday transactions, savings, and DeFi applications. There are three main types: fiat-backed stablecoins (USDT, USDC), where 1:1 dollar reserves are held by a centralised company; crypto-collateralised stablecoins (DAI), where excess crypto collateral backs the peg on-chain; and algorithmic stablecoins, which attempt to maintain the peg through code and token supply mechanisms. Tether (USDT) is the largest stablecoin by market cap (over $100 billion) and the most traded crypto asset by daily volume. USD Coin (USDC) is considered more transparent due to Circle’s regular third-party audits of reserves. MakerDAO’s DAI uses over-collateralisation — users must lock up at least 150% of the value they want to borrow in DAI — to maintain decentralisation and resilience. The failure of TerraUSD (UST) in May 2022, which lost its peg catastrophically and wiped out $40 billion in value, demonstrated the existential risks of algorithmic stablecoins without genuine collateral. In India, stablecoins are used for crypto-to-crypto trading, cross-border remittances (bypassing SWIFT’s fees), and DeFi yield strategies. The 1% TDS on crypto transactions makes frequent stablecoin movements administratively burdensome.
Token
In the crypto context, a token is a digital asset created on top of an existing blockchain, as opposed to a “coin” which is the native currency of its own blockchain (e.g., ETH is Ethereum’s coin; USDC is a token built on Ethereum). Tokens are typically issued via smart contracts following standardised token standards: ERC-20 for fungible tokens on Ethereum, ERC-721 for NFTs, BEP-20 for BNB Chain, and SPL for Solana. Tokens can represent a wide variety of assets and rights: governance votes, access to a protocol’s services, real-world assets (tokenised gold, bonds), in-game items, or simply speculative instruments. There are several categories of tokens: utility tokens (used to access services within a protocol, e.g., FIL for Filecoin storage), governance tokens (used to vote on protocol decisions, e.g., UNI for Uniswap, AAVE for Aave), security tokens (representing ownership of real-world assets, regulated as securities in most jurisdictions), stablecoins (pegged to fiat), and memecoins (speculative, community-driven). The distinction between “coin” and “token” matters legally — regulators like the US SEC have argued that most tokens constitute securities, while Ethereum’s ETH and Bitcoin’s BTC have generally been treated as commodities. In India, all tokens — regardless of category — are classified as Virtual Digital Assets (VDAs) under the Finance Act 2022 and are subject to the 30% tax regime.
TVL (Total Value Locked)
Total Value Locked (TVL) is the aggregate value of all cryptocurrency assets deposited into a DeFi protocol’s smart contracts — encompassing collateral in lending protocols, funds in liquidity pools, staked assets, and tokens deposited in yield vaults. TVL serves as the primary metric for measuring the size, adoption, and health of a DeFi protocol or the DeFi ecosystem as a whole. It is the closest DeFi equivalent to Assets Under Management (AUM) in traditional finance. DeFiLlama.com is the definitive source for real-time TVL data across all chains and protocols. TVL should be interpreted carefully. High TVL indicates strong user trust and capital deployment but doesn’t necessarily reflect protocol revenue or profitability. TVL can be inflated through “recursive” TVL — when yield aggregators deposit into lending protocols that deposit into other protocols, the same capital is counted multiple times. TVL also changes based on asset prices, not just asset quantities — a 50% drop in ETH price mechanically halves the ETH-denominated TVL of Ethereum protocols. The TVL ratio (comparing TVL to protocol market cap) helps identify undervalued or overvalued DeFi tokens. DeFi’s peak TVL was approximately $180 billion in November 2021. The 2022 bear market and Terra/LUNA collapse reduced it to approximately $40 billion. By 2024, it had recovered to $100B+, with Ethereum Layer 2 networks contributing a growing share.
Web3
Web3 (or Web 3.0) is the concept of a decentralised internet built on blockchain technology, where users own their data, digital assets, and identities — in contrast to Web2 (the current internet) where platforms like Google, Meta, and Amazon control user data and extract value. The term was coined by Ethereum co-founder Gavin Wood in 2014. In Web3, applications (“dApps”) run on decentralised networks, users authenticate with cryptographic wallets instead of centralised accounts, and digital ownership is enforced by smart contracts rather than platform terms of service. Key components of Web3 include: decentralised storage (IPFS, Arweave, Filecoin) replacing centralised cloud servers; decentralised identity (DIDs, ENS domains like “alice.eth”) replacing email-based accounts; token-based ownership and governance replacing terms-of-service agreements; and DeFi replacing centralised financial services. The economic model of Web3 typically involves “tokenomics” — issuing a protocol token to incentivise early participants, fund development, and distribute governance. Successful Web3 protocols (Uniswap, Aave, Compound) generate real economic activity; most Web3 projects remain speculative or fail. Critics of Web3 argue that most Web3 applications are slower, more expensive, and less user-friendly than their Web2 counterparts, and that the decentralisation is often superficial (many dApps use centralised APIs, front-ends, and oracles). Jack Dorsey (Twitter/X founder) is a prominent critic, calling Web3 “ultimately a centralised entity with a different label.” In India, the Web3 talent pool is substantial — Polygon, one of Web3’s most important infrastructure layers, was co-founded by Indian engineers Sandeep Nailwal, Anurag Arjun, and Jaynti Kanani.
Whale
In cryptocurrency markets, a “whale” refers to an individual or entity that holds a sufficiently large amount of a particular cryptocurrency to have the potential to influence its market price through large buy or sell orders. The term is borrowed from gambling culture (referring to high-stakes gamblers) and has become standard crypto market parlance. Whales contrast with “shrimp” (very small holders), “fish,” “dolphins,” and “sharks” — informal tiers based on holding size. For Bitcoin, a wallet holding more than 1,000 BTC (~$100 million at current prices) is typically considered a whale. Whale movements are closely monitored by on-chain analysts and traders, as large transfers of coins to or from exchange wallets can signal impending selling pressure or accumulation. Tools like Whale Alert, Glassnode, and Nansen provide real-time on-chain data tracking large wallet movements. When a dormant whale wallet (inactive for years) suddenly moves Bitcoin to an exchange, the market often interprets this as a sell signal. Conversely, large accumulation at key price levels — tracked via “supply distribution” metrics — is seen as a bullish signal. Early Bitcoin adopters, crypto exchange founders (like the Binance CEO, CZ), and institutional players like MicroStrategy ($MSTR), BlackRock’s Bitcoin ETF, and sovereign wealth funds constitute today’s whale category. In India, early crypto investors who bought Bitcoin below ₹1 lakh became significant rupee-denominated whales.
Yield Farming
Yield farming is the practice of deploying crypto assets across DeFi protocols — lending pools, liquidity pools, staking contracts — to maximise returns (yield) from transaction fees, interest, and governance token rewards. It emerged during the “DeFi Summer” of 2020 when Compound Finance began distributing COMP governance tokens to both lenders and borrowers, creating the concept of “liquidity mining.” Yield farmers constantly shift capital between protocols in search of the highest risk-adjusted APY, often compounding rewards daily or even hourly. Yield farming strategies range from simple (depositing USDC in Aave at 4-8% APY) to highly complex (multi-step strategies involving flash loans, leveraged positions, and cross-chain bridging). Aggregators like Yearn Finance automate the process — users deposit a single asset and Yearn’s “strategies” automatically route capital to the best-yielding opportunity, compounding gains and rebalancing as rates change. At peak DeFi in 2021, some farms offered APYs of 1,000%+ — but these were almost always unsustainable and involved enormous risks of smart contract exploits and token value collapse. Key risks include: smart contract vulnerabilities, impermanent loss (for liquidity providers), governance token inflation diluting yield value, and the compounding effect of gas fees eating into returns for smaller capital. The Indian tax treatment of yield farming income is unclear — it likely falls under either income tax or VDA tax rules, and the 1% TDS complicates automated compounding strategies.
ZK Rollup
A ZK (Zero-Knowledge) Rollup is a Layer 2 blockchain scaling solution that processes transactions off the Ethereum mainchain and generates a cryptographic validity proof (ZK-SNARK or ZK-STARK) that mathematically proves the correctness of all transactions in a batch. This proof is posted to Ethereum Layer 1, where it can be verified efficiently without replaying all the computations. Unlike Optimistic Rollups, ZK Rollups have near-instant finality — withdrawals back to Ethereum L1 don’t require a 7-day challenge period. Leading ZK Rollups include zkSync Era, StarkNet, Polygon zkEVM, and Linea. The mathematical foundation of ZK proofs is one of the most exciting developments in applied cryptography. A ZK-SNARK (Succinct Non-interactive ARgument of Knowledge) allows one party to prove to another that a statement is true without revealing any information beyond the truth of the statement itself. Applied to blockchain, this means: “I processed 10,000 valid transactions and here’s the 200-byte proof that they were all valid — trust the math, don’t replay the transactions.” ZK proofs reduce Ethereum’s verification burden by orders of magnitude, enabling the network to scale massively. ZK Rollups are widely considered the endgame for Ethereum scalability. Vitalik Buterin has repeatedly stated his long-term vision of an “all-ZK” Ethereum. The bottleneck today is ZK proof generation time (still takes minutes for large batches) and the difficulty of building ZK-compatible smart contracts (not all EVM operations are efficiently provable).
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