JSON

JavaScript Object Notation, a lightweight data interchange format used everywhere in web and blockchain APIs, human readable yet easy for machines to parse.

JavaScript SDK

Client library used in web apps to interact with blockchain nodes, wallets, or AI APIs from the browser or Node.js, for example ethers, web3, viem, or official vendor…

Jitter

Variation in network latency over time; affects block propagation, mempool synchronization, and user perceived responsiveness in dapps and wallets.

JPEG, My JPEGs

Community slang for NFTs, originally mocking simple image based collectibles, now a casual way to refer to any non fungible token artwork or profile picture.

Juels (LINK Unit)

Smallest unit of Chainlink’s LINK token used in contracts and billing, analogous to wei for ETH, where 1 LINK equals 10^18 juels.

Jito

Ecosystem around Solana block production that introduces MEV aware clients, bundles, and auctions to reduce spam and share tips with validators and stakers.

Jamming Attack (Lightning)

Denial of service tactic where an attacker holds HTLC slots or routes with low probability payments to block capacity, mitigated with reputation and fees.

JIT Channel, Just In Time Channel

Lightning wallet pattern where a channel is opened on demand to receive a payment, shifting on chain cost to the moment of first use and improving UX for…

JoinMarket

Bitcoin CoinJoin marketplace that coordinates collaborative transactions between makers and takers to improve privacy while paying liquidity providers.

JoinSplit (Zcash)

Transaction component that proves shielded inputs and outputs balance without revealing addresses or amounts, enabling private transfers in Zcash.

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