Jellyfish Merkle Tree

Sparse Merkle tree variant optimized for key value state with efficient updates and proofs, used in Diem and Aptos style blockchains.

Jubjub Curve

Twisted Edwards elliptic curve designed for efficient zk SNARK friendly operations, used in Zcash’s Sapling and related privacy protocols.

JWE, JSON Web Encryption

Standard for encrypting JSON tokens so only intended recipients can read the payload; used for private credentials and secure transport to wallets or relays.

JWS, JSON Web Signature

Standard for signing arbitrary payloads with JSON tokens producing a compact serialization; ensures integrity and authenticity of API calls and claims.

JWK, JSON Web Key

JSON data structure that represents a cryptographic key with parameters like kty, kid, and alg; used to publish and rotate keys for JWT verification.

JWT, JSON Web Token

Compact token format with claims signed or encrypted using JWS or JWE; used for authenticating to node APIs, relays, and wallets without sharing passwords.

JSON Schema

Specification for describing the shape and validation rules of JSON documents; used for NFT metadata, oracle payloads, and API contracts.

ABI, JSON ABI

Application Binary Interface described in JSON that defines a contract’s functions, events, and types so clients can encode calls and decode logs.

JSON RPC

Lightweight remote procedure call protocol encoded in JSON, standard interface for Ethereum and many chains, used by wallets and dapps to query nodes and send transactions.

JSON Lines, JSONL

Data format where each line is a valid JSON object, convenient for streaming logs, training datasets, and batched API requests.

Jupyter Notebook

Interactive document format that mixes code, text, and outputs, popular for data exploration, model prototyping, and reproducible research.

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