Glossary
The vocabulary of verifiable credentials.
Every concept behind LearnCoin, one URL each. Self-contained definitions with external spec links and cross-references to related terms. Written to be usable by humans, crawlers, and AI agents without any other page loaded.
100 terms · Updated continuously
Blockchain
Public-chain concepts relevant to credential anchoring — L2s, rollups, OP Stack, block explorers.
Base
Also: Base L2, Base (Coinbase)
Coinbase's open-source Ethereum Layer 2 built on the Optimism OP Stack — the network LearnCoin anchors every credential batch to.
Read definitionBase Sepolia
Also: Base testnet
Base's test network — where LearnCoin's Developer-tier credentials anchor, free and unlimited, before graduating to Base mainnet.
Read definitionBasescan
The Etherscan-family block explorer for Base — the primary UI for inspecting LearnCoin anchor transactions on-chain.
Read definitionCalldata
Raw transaction payload data on an EVM chain — the space where LearnCoin writes Merkle roots as part of the anchor transaction.
Read definitionEIP-4844
Also: proto-danksharding, blob transactions
The Ethereum upgrade that introduced 'blob' data — cheaper, ephemeral data availability that L2s use to post batches back to L1.
Read definitionEthereum
Also: Ethereum L1, Ethereum mainnet
The public, permissionless, smart-contract-capable blockchain that serves as LearnCoin's ultimate settlement substrate via Base L2.
Read definitionEthereum L1
Also: Ethereum Layer 1, Ethereum mainnet
The base Ethereum network — the L1 that Base (and every other OP-Stack rollup) settles back to via the withdrawal bridge.
Read definitionEthereum L2
Also: Ethereum Layer 2, L2, Layer 2 rollup
A blockchain that batches transactions and periodically settles them to Ethereum's Layer 1, inheriting L1's security at a fraction of the cost.
Read definitionFraud proof
An optimistic rollup's mechanism for challenging invalid state transitions — the 'challenge window' that anchors L2 security.
Read definitionOP Stack
Also: Optimism OP Stack
The open-source modular software stack that powers Optimism and Base, defining how an Ethereum Layer 2 rollup is built.
Read definitionRollup
Also: rollup chain, optimistic rollup, zk-rollup
A Layer 2 architecture that executes transactions off-chain and posts compressed batches plus validity or fraud proofs back to Layer 1.
Read definitionValidity proof
Also: ZK validity proof, SNARK proof
The cryptographic proof a zk-rollup posts to Layer 1 to prove its state transitions were correct — the zk counterpart to an optimistic fraud proof.
Read definitionzk-rollup
Also: zero-knowledge rollup, validity rollup
A Layer 2 rollup that proves state validity cryptographically — faster finality than optimistic rollups, at the cost of more complex proving.
Read definition
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