Sandwich attack
Markets & TradingAn attack where a bot places a buy just before a victim's trade and a sell just after it, forcing the victim into a worse price and pocketing the difference.
SDK
Technology & InfrastructureSoftware Development Kit
A packaged set of libraries and tools for building on a platform. Chains and protocols ship SDKs so developers can integrate without writing low-level code.
Season
Tokenomics & LaunchA defined campaign period in a points or airdrop program, after which scores are snapshotted and rewards distributed. Programs often run several numbered seasons.
SEC
Regulation & InstitutionsSecurities and Exchange Commission
The US federal agency that regulates securities offerings, exchanges, brokers, and public company disclosure. Any token that qualifies as a security falls under its jurisdiction when offered to US investors.
$NPKNA security token sold into the US must fit an SEC registration or exemption lane such as Reg D or Reg S.
Security
Regulation & InstitutionsA tradable investment instrument such as a share, bond, or investment contract, regulated under securities laws that mandate disclosure and fair dealing. Whether a token is a security determines which rulebook, regulator, and trading venues apply to it.
$NPKN$NPKN is deliberately structured as a security: tokenized common equity of a real company rather than a utility-token workaround.
Security token
DeFi & ApplicationsA token that legally represents a regulated security, such as equity, debt, or a fund share, and carries the rights and obligations of securities law. Unlike most crypto tokens, it does not try to avoid that classification.
$NPKNThe asset class at the heart of $NPKN's world; issuance and trading must run through compliant venues.
Seed phrase
Technology & InfrastructureA list of 12 or 24 words that encodes a wallet's master key. Anyone with the phrase controls every account derived from it, so it is the single most sensitive thing a holder owns.
Self-custody
Technology & InfrastructureHolding your own keys rather than trusting an exchange or custodian. Maximum control, and full personal responsibility for security.
Senior secured
Regulation & InstitutionsDebt that ranks first in the repayment queue and is backed by collateral over specific assets. In a default, senior secured creditors are paid from the collateral before anyone else sees a dollar.
Sequencer
Technology & InfrastructureThe operator that orders and batches transactions on a rollup. Most rollups still run a single centralized sequencer, with decentralization efforts ongoing.
SFC
Regulation & InstitutionsSecurities and Futures Commission
Hong Kong's securities regulator. It licenses virtual asset trading platforms and applies securities rules to tokens that qualify as securities.
Sharding
Technology & InfrastructureSplitting a blockchain's workload across multiple parallel segments called shards so the network can process more transactions at once.
Shared sequencer
Technology & InfrastructureA sequencing service used by several rollups at once, enabling atomic cross-rollup transactions and reducing each rollup's reliance on its own centralized sequencer.
Shill
Culture & CommunityTo promote a token or project aggressively, often with an undisclosed financial interest. Used as both a verb and a noun for the promoter.
Shitcoin
Culture & CommunityA derogatory term for a token with no credible value proposition. One trader's shitcoin is another trader's memecoin bet.
Sidechain
Technology & InfrastructureAn independent blockchain connected to a main chain by a bridge, with its own validators and security rather than inheriting the main chain's.
Slashing
Technology & InfrastructureThe penalty that destroys part of a validator's staked tokens for provable misbehavior, such as signing two conflicting blocks.
Slippage
Markets & TradingThe difference between the price you expected and the price you actually got, caused by thin depth or by the price moving while your order executes.
Smart contract
Technology & InfrastructureCode deployed on a blockchain that runs exactly as written when triggered, holding and moving funds without an intermediary.
Snapshot
Tokenomics & LaunchA record of all balances or activity taken at a specific block, used to fix eligibility for an airdrop, vote, or fork. Also the name of a widely used off-chain governance voting platform.
Snapshot vote
Culture & CommunityAn off-chain governance vote, usually on the Snapshot platform, where voting power is measured from token balances at a fixed past block. Voting is free because nothing is written on-chain.
SNARK
Technology & InfrastructureSuccinct Non-interactive Argument of Knowledge
A small, fast-to-verify zero-knowledge proof. Most SNARK systems require a one-time trusted setup ceremony.
SocialFi
DeFi & ApplicationsSocial Finance
Social media applications with built-in financial incentives, such as tokenized profiles, creator coins, and paid access to feeds. friend.tech was the best-known experiment.
Soft fork
Technology & InfrastructureA backward-compatible tightening of protocol rules, where non-upgraded nodes still follow the same chain. Bitcoin's SegWit upgrade is the classic example.
Soft rug
Tokenomics & LaunchA slow-motion rug: the team quietly sells its tokens and stops delivering without a single dramatic drain. Harder to detect and prove than an outright rug pull.
Solidity
Technology & InfrastructureThe most widely used programming language for writing Ethereum smart contracts.
Solver
DeFi & ApplicationsA competing party in an intent-based system that finds the best way to fulfill a user's desired outcome, such as the best swap price. Solvers bid to execute intents.
Spoofing
Markets & TradingPlacing large orders you intend to cancel in order to create a false impression of supply or demand. A form of market manipulation banned on regulated venues.
Spread
Markets & TradingThe gap between the best bid and the best ask. Tight spreads signal a liquid market; wide spreads make every round trip more expensive.
$NPKNMarket maker agreements typically commit to maximum spreads and minimum depth on named pairs.
SPV
Regulation & InstitutionsSpecial Purpose Vehicle
A company created for a single defined purpose, such as holding one asset, issuing one bond series, or executing one acquisition. SPVs isolate risk so trouble in one venture does not infect the parent.
$NPKNBond issuance and individual acquisitions in an M&A engine typically run through SPVs to ring-fence liabilities.
Stabilization safe harbour
Regulation & InstitutionsA carve-out from market abuse rules that lets underwriters support a security's price for a limited period after an offering, within disclosed limits on time, price, and volume. It exists because some post-offering support is useful, but only when the market knows it is happening.
$NPKNIt is the regulated template for compliant post-TGE market support: disclosed, bounded, and time-limited rather than covert.
Stablecoin
DeFi & ApplicationsA token designed to hold a steady value, usually one US dollar, backed by reserves or a stabilizing mechanism. The main medium of exchange and settlement across crypto.
Stablecoin ordinance
Regulation & InstitutionsHong Kong's Stablecoins Ordinance, in force since August 2025, which requires issuers of fiat-referenced stablecoins to be licensed by the Hong Kong Monetary Authority with full reserve backing and redemption at par. It made Hong Kong one of the first jurisdictions with a dedicated stablecoin licensing regime.
Staking
Technology & InfrastructureLocking tokens to help secure a proof-of-stake network in exchange for rewards, typically a few percent per year.
Staking pool
DeFi & ApplicationsA service that combines many holders' tokens to run validators together and share staking rewards. It lets small holders stake without meeting minimums or running hardware.
STARK
Technology & InfrastructureScalable Transparent Argument of Knowledge
A zero-knowledge proof type that needs no trusted setup and is considered resistant to quantum attacks, at the cost of larger proof sizes.
State channel
Technology & InfrastructureAn off-chain channel where two parties transact rapidly and settle only the final result on-chain, an early scaling approach that predates rollups.
Stealth launch
Tokenomics & LaunchDeploying a token with no advance announcement and letting the market discover it live. Common for memecoins and the opposite of a marketed, bookbuilt launch.
Stop loss
Markets & TradingAn order that automatically closes a position once price crosses a set level, capping how much the position can lose.
Structured product
DeFi & ApplicationsA packaged investment that combines assets and derivatives into one product with a defined payoff, such as steady yield with capped upside. On-chain versions are usually delivered as vaults.
Subgraph
Technology & InfrastructureAn open API on The Graph protocol that indexes a specific contract's events and state, letting applications query blockchain data with GraphQL.
Subnet
Technology & InfrastructureA sovereign blockchain launched within a larger network's framework, such as an Avalanche subnet, with its own validator set and custom rules.
$NPKNPermissioned subnets are a common home for institutional and tokenized-asset deployments that need validator control.
Subordination
Regulation & InstitutionsThe contractual ranking of one debt below another, so junior creditors are paid only after senior creditors are satisfied. Structural subordination also arises when creditors sit at a holdco while assets sit at the opco.
Supercycle
Culture & CommunityThe theory that structural adoption will let crypto skip the usual deep bear market and keep rising across cycles. Used earnestly by believers and ironically by everyone else.
Sybil
Tokenomics & LaunchOne actor controlling many wallets to pose as many separate users, typically to farm airdrop allocations or sway governance. Teams run Sybil detection before distributions to filter these clusters.
Synthetic asset
DeFi & ApplicationsA token that tracks the price of another asset, like a stock or commodity, without holding it, using collateral and price oracles instead. It gives on-chain exposure to off-chain markets.
Szn
Culture & CommunitySeason
Slang spelling of season, describing a hot period for a particular sector, as in 'NFT szn' or 'memecoin szn.'