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Foundations: Scaling / Rollups

What is a Sequencer?A sequencer is the part of a rollup or high-throughput chain that decides transaction order before the base layer settles the result

What is a Sequencer?A sequencer is the part of a rollup or high-throughput chain that decides transaction order before the base layer settles the result. That sounds simple, but this ordering role is where latency, censorship risk, MEV, cross-chain composability, and much of a system’s practical trust model actually live.Mar 21, 202624 min read

What Is a ZK Rollup?ZK rollups solve a strange problem: how can a blockchain trust computation it did not perform itself? Their answer is to execute transactions offchain, publish the data needed to reconstruct state, and attach a succinct proof that the new state is correct

What Is a ZK Rollup?ZK rollups solve a strange problem: how can a blockchain trust computation it did not perform itself? Their answer is to execute transactions offchain, publish the data needed to reconstruct state, and attach a succinct proof that the new state is correct.Mar 21, 202623 min read

What is Validium?Validium is an unusual scaling design: it keeps the strongest part of a ZK rollup — cryptographic proof that state updates are valid — while moving the heaviest part, transaction data, off-chain

What is Validium?Validium is an unusual scaling design: it keeps the strongest part of a ZK rollup — cryptographic proof that state updates are valid — while moving the heaviest part, transaction data, off-chain. That trade changes fees, throughput, privacy, and trust assumptions all at once.Mar 21, 202624 min read

What is Volition?Volition exists because data availability is where many rollup costs and trust assumptions actually live

What is Volition?Volition exists because data availability is where many rollup costs and trust assumptions actually live. It gives users or applications a choice: pay for on-chain data when you want stronger recovery guarantees, or keep data off-chain when lower cost or confidentiality matters more.Mar 21, 202624 min read

What is Restaking for L2 Security?Restaking for L2 security tries to answer a hard question: how can a rollup or related service get meaningful security before it has its own large validator economy? The idea is to reuse already-staked assets as collateral for additional duties, but the details matter because shared security is never the same as native security

What is Restaking for L2 Security?Restaking for L2 security tries to answer a hard question: how can a rollup or related service get meaningful security before it has its own large validator economy? The idea is to reuse already-staked assets as collateral for additional duties, but the details matter because shared security is never the same as native security.Mar 21, 202625 min read

What is a Shared Sequencer?A shared sequencer tries to solve a strange problem in rollups: each chain can be fast on its own, yet the moment users need to coordinate across chains, latency, fragmentation, and trust assumptions come back

What is a Shared Sequencer?A shared sequencer tries to solve a strange problem in rollups: each chain can be fast on its own, yet the moment users need to coordinate across chains, latency, fragmentation, and trust assumptions come back. By giving multiple rollups a common ordering layer, shared sequencing aims to make cross-rollup interaction feel less like messaging between separate worlds and more like one market with one clock.Mar 21, 202624 min read

What is a Validity Proof?A validity proof lets a blockchain accept an offchain computation without redoing the work itself

What is a Validity Proof?A validity proof lets a blockchain accept an offchain computation without redoing the work itself. That simple shift changes the economics of scaling: a layer 1 checks a compact proof of correctness instead of re-executing every transaction, which is why validity rollups can offer fast finality and strong security at the same time.Mar 21, 202624 min read

What is a Rollup?Rollups matter because they change the scaling tradeoff that made many blockchains expensive to use: instead of asking the base chain to execute every transaction, they ask it to verify and store just enough to keep the system honest

What is a Rollup?Rollups matter because they change the scaling tradeoff that made many blockchains expensive to use: instead of asking the base chain to execute every transaction, they ask it to verify and store just enough to keep the system honest. That simple shift is why rollups can be much cheaper than L1 while still leaning on L1 for security.Mar 21, 202623 min read

What is a Fraud Proof?Fraud proofs are the mechanism that makes optimistic rollups more than a promise

What is a Fraud Proof?Fraud proofs are the mechanism that makes optimistic rollups more than a promise. Instead of proving every state transition up front, they let the system move fast by assuming correctness — and then give anyone a way to force a precise, onchain check when something looks wrong.Mar 21, 202624 min read

What is an Optimistic Rollup?Optimistic rollups matter because they try to get the best part of a blockchain twice: cheap, fast execution offchain, with security still anchored to a more expensive base chain

What is an Optimistic Rollup?Optimistic rollups matter because they try to get the best part of a blockchain twice: cheap, fast execution offchain, with security still anchored to a more expensive base chain. The key idea is simple but subtle: assume batches are valid unless someone proves otherwise, and make that challenge process reliable enough to matter.Mar 21, 202623 min read

What is an Aggregator?An aggregator is the rollup component that turns many offchain transactions into a small onchain footprint

What is an Aggregator?An aggregator is the rollup component that turns many offchain transactions into a small onchain footprint. It is where scalability becomes concrete: batching, compression, data publication, and sometimes proof submission all happen here — along with some of a rollup’s sharpest trust and liveness tradeoffs.Mar 21, 202622 min read