Crypto & DeFi

Rollup Finality vs Soft Confirmation Soft confirmations offer economic guarantees but not cryptographic finality; understanding the gap is critical for high-value transfers on rollups.

Rollup Transaction Fees Explained How users on optimistic and ZK rollups pay fees, including the split between L2 execution cost and L1 data-posting cost.

Rug Pull Mechanics in DeFi How rug pulls work in DeFi: liquidity removal, backdoored contracts, and mint functions. Learn the on-chain red flags that signal elevated rug-pull risk.

SAFT Agreement Simple Agreement for Future Tokens — a forward contract that delivers tokens to investors only after a blockchain network launches.

Sandwich Attacks in DeFi Explained How sandwich attacks in DeFi work: bots front-run and back-run user swaps to extract value. Learn how slippage settings reduce exposure.

Scroll An Ethereum layer 2 that uses zero-knowledge proofs to verify transactions while remaining bytecode-equivalent with the Ethereum Virtual Machine.

Security Token A digital token that represents ownership, equity, or debt claims, and is regulated as a security.

Seed Phrase Security for Crypto Holders Understand how to secure a crypto seed phrase using physical backup methods and avoid digital theft in cryptocurrency wallets.

Seed Phrase: What It Is and How It Works A seed phrase is a string of 12–24 words that derives private keys for a crypto wallet. Learn how BIP-39 mnemonics work and how to secure them offline.

Self-Custody in Crypto The practice and architecture of holding cryptocurrency private keys without delegating control to a third-party custodian.

Selfish Mining A block-withholding strategy that lets a minority miner earn outsized rewards by controlling the timing of block release.

Semi-Fungible Token ERC-1155 tokens that are mutually exchangeable within a class but retain unique identity across different classes.

Sequencer Decentralisation The problem of centralised rollup sequencers creating censorship and MEV risks, and proposed solutions like threshold encryption and encrypted mempools.

Sequencer MEV in Rollups How rollup sequencers extract maximal extractable value and what mechanisms aim to prevent it or redistribute it fairly.

Sharded Consensus and Cross-Shard Coordination How sharded consensus splits validators into parallel groups for scalability and the coordination challenges when transactions span multiple shards.

Sharding Protocol Partitioning blockchain into shards to enable parallel transaction processing and improve network scalability.

Shared Sequencer Network A neutral sequencing layer that coordinates transaction ordering across multiple rollups to enable atomic cross-rollup execution and improved capital efficiency.

Sidechain Bridge A protocol or mechanism that connects a parallel blockchain (sidechain) to a main blockchain, enabling assets to transfer between the two chains.

Single-Sided Liquidity Provision in DeFi How single-sided liquidity provision in DeFi lets you deposit one token instead of equal parts of a pair, and the trade-offs involved.

Slashing Slashing is a penalty mechanism in proof-of-stake blockchains where validators lose part or all of their staked collateral for misbehaviour. It is the enforcement mechanism that makes proof-of-stake secure.

Slashing Conditions: Double Voting and Surround Votes Explained Slashing conditions penalize validators who commit provably malicious acts like double voting and surround voting, protecting proof-of-stake consensus.

Slashing Mechanisms Automatic penalties that destroy a portion of a proof-of-stake validator's staked collateral to deter double-signing, equivocation, and other protocol violations.

Slippage in Crypto Trading Explained What is slippage in crypto trading? How order size, market depth, and volatility drive price movement. Learn to estimate it before trading.

Smart Contract Self-executing code deployed on a blockchain that automatically enforces agreement terms without intermediaries or manual intervention.

Smart Contract Upgrade Risk in DeFi How upgradeable smart contracts in DeFi introduce ongoing governance and admin-key risks even after initial security audits.

Snowball Algorithm in Blockchain Consensus Snowball builds consensus through repeated random sampling of validators. Learn how metastability makes it ideal for high-throughput, low-latency blockchains.

SOC 2 Audits for Crypto Custodians What SOC 2 Type II reports cover for crypto custodians, why institutional investors require them, and what they do and do not verify.

Social Token Creator- or community-issued tokens that grant access, rewards, or governance rights within a social network, monetizing reputation and participation.

Solana Solana is a high-throughput blockchain designed to process transactions rapidly through parallel transaction processing and a proof-of-history consensus mechanism. It prioritises speed over decentralisation.

Solana Network Outages: Causes and Recovery Why Solana experiences network outages: Gulf Stream congestion, validator synchronization issues, and the technical limits of high-speed blockchain architecture.

Solana Proof of History Explained How Solana's cryptographic clock lets validators order transactions without constant coordination—the core of its high-speed blockchain design.

Solana Validator Requirements Running a Solana validator requires significant hardware, bandwidth, and staked SOL—costs that affect network decentralization and who can operate validators.

Solo Staking vs Pooled Staking: Security and Reward Trade-Offs Solo staking and pooled staking offer different tradeoffs in decentralization, technical burden, uptime risk, and net rewards. Understand which fits your position.

Soulbound Token A non-transferable, non-sellable blockchain token permanently tied to a single wallet address, used for verifiable credentials and reputation.

Specific Identification Method for Crypto Cost Basis Crypto specific identification method lets you designate individual coin lots to minimize capital gains. Learn the IRS rules and recordkeeping you need.

Stablecoin A cryptocurrency designed to maintain a stable value, typically pegged to a reference asset like the US dollar or gold.

Stablecoin Collateralization Ratio Explained What over-collateralization means for crypto-backed stablecoins, why ratios above 100% are required, and what happens when collateral falls below the threshold.

Stablecoin Depeg Risk The mechanisms and market conditions under which collateralized or algorithmic stablecoins lose their fixed dollar peg, and the cascade effects across DeFi.

Stablecoin Tax Treatment: Are Stablecoin Trades Taxable? Stablecoin swaps trigger capital gains only if the stablecoin's value differs from USD. Learn the tax treatment and rare edge cases where gains occur.

Stacks A Bitcoin layer that enables smart contracts and programmability by anchoring state to Bitcoin blocks via Proof of Transfer, without modifying Bitcoin itself.

Stacks and Bitcoin Smart Contracts How Stacks enables programmable smart contracts that settle on Bitcoin without modifying the Bitcoin base layer, using Proof of Transfer consensus.

Stake Grinding Attack Explained How attackers in proof-of-stake systems iterate block parameters to bias future leader elections and the protocol mitigations used to prevent it.

Staking Staking is the process of locking cryptocurrency as collateral in a proof-of-stake network to participate in consensus and earn rewards. Stakers receive interest on their staked coins but risk losing them if they misbehave.

Staking as Passive Income: What Retirees Should Understand How proof of stake generates staking rewards, the mechanics of lock-up risk, and tax treatment for income-oriented investors planning passive returns.

Staking Derivative Token Explained A staking derivative token represents a claim on staked crypto assets and their rewards. Learn how liquid staking tokens work, accrue value, and the redemption and de-peg risks they carry.

Staking Income vs Capital Gain: How Each Is Taxed Learn how staking rewards are taxed as ordinary income at receipt, and how selling staked crypto triggers a separate capital gain or loss.

Staking Rewards Tax How tax authorities treat income from cryptocurrency staking rewards and validator participation.

Staking vs Liquidity Mining: Key Differences Staking locks tokens to earn protocol rewards; liquidity mining provides LP positions to earn trading-fee and token incentives. Different risk profiles, yield sources, and tax treatment.

Staking Withdrawal Credentials Explained Withdrawal credentials are the two data formats that tell Ethereum where staked ETH goes when withdrawn: BLS to a new validator, or 0x01 execution-layer address.

State Channel Off-chain transaction protocol enabling participants to transact repeatedly without touching the blockchain, settling periodically on-chain.

State Growth Problem in Blockchain How unbounded on-chain state accumulation degrades blockchain node performance, and the technical approaches—state expiry, statelessness, verkle tries—that address it.

Stellar Stellar is an open-source payment network designed to connect financial institutions and enable efficient cross-border payments. Its native asset is Lumens (XLM), and it uses a federated consensus mechanism.

Stop-Loss Orders in Crypto Trading Learn how stop-loss and stop-limit orders work on crypto exchanges, why 24/7 markets create gap risk, and best practices for using them.

Sui A Layer 1 blockchain where objects are first-class citizens, enabling transactions to execute in parallel without global ordering.

Sui Object-Centric Model Explained How Sui stores blockchain state as owned objects rather than a global account tree, enabling parallel transaction execution.

Sybil Attack An attack in which a single entity creates multiple identities to gain disproportionate voting power or economic benefit.

Sybil Resistance in Consensus Mechanisms How proof of work, proof of stake, and proof of authority each prevent Sybil attacks—where attackers create fake identities to dominate consensus voting.

Sync Committee Role in Light Clients Sync committees enable light clients on Ethereum to verify the chain head without downloading full blocks. Learn how committee members rotate and why this matters for scalability.

Synthetic Asset On-chain tokens that track real-world or cross-chain asset prices through collateral backing and decentralized oracle feeds.

Tax Deduction for Lost or Stolen Cryptocurrency Understand whether lost or stolen crypto qualifies for a tax deduction after the 2017 TCJA and what conditions must be met to claim a casualty or theft loss.