Sei Giga
Sei Giga is a multi-concurrent producer parallelized EVM layer-1 blockchain that achieves over 5 gigagas/sec throughput and sub-250ms finality by decoupling execution from consensus through async block execution, state agreement, and a two-layer architecture utilizing Autobahn consensus with separate data availability and consensus layers.
Original paper licensed under CC BY 4.0 (http://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
The Big Picture: What is Sei Giga?
Imagine a busy highway system for digital money and contracts (blockchain). The old system (Sei v2) was like a single-lane toll road where one traffic cop (the "leader") had to check every car, write down the details, and give the green light before the next car could move. This caused traffic jams.
Sei Giga is a new, super-highway design. Instead of one cop, it has many lanes where cars can enter simultaneously. It separates the job of "deciding the order of cars" from the job of "checking if the cars are actually driving correctly." This allows the highway to handle massive amounts of traffic (over 5 gigagas) with almost no delay (under 250ms).
1. The Core Innovation: The "Order First, Check Later" Strategy
In the old system, the traffic cop had to verify every car's engine and license before letting it onto the main road. If the engine check took too long, the whole line stopped.
Sei Giga's approach:
- Order First: The system quickly agrees on the order in which cars enter the highway. This happens almost instantly.
- Check Later: Once the order is set, the cars drive off into a parallel "inspection zone" (asynchronous execution). The inspectors check the engines and write logs in the background.
- The Safety Net: Later, the inspectors send a quick "All Clear" note (a digest) back to the main road. If everyone agrees the cars are fine, the state is finalized. If a few inspectors disagree, the system can pinpoint exactly which car caused the issue without stopping the whole highway.
Analogy: Imagine a restaurant. Instead of the chef cooking the meal, plating it, and serving it all at once (blocking the kitchen), the order is taken and written down immediately (consensus). The kitchen then cooks the meal in parallel. The waiter only needs to confirm the meal is ready later, not wait for the cooking to finish before taking the next order.
2. The Engine: Autobahn Consensus
The paper introduces a protocol called Autobahn.
- The Problem: Old systems (like Tendermint) use a "single leader" who proposes a block. If that leader gets sick or slow, the whole system waits.
- The Solution: Autobahn is a Multi-Proposer system. Think of it like a relay race where every runner has their own lane. Everyone is constantly throwing their "batons" (data proposals) into their own lane.
- The "Tip Cut": Every so often, a referee looks at the very end (the "tip") of every lane and snaps a photo (a "cut"). This photo proves that all those lanes have valid data. Because the lanes are independent, the referee can snap photos of 180 blocks at once, whereas the old system could only handle 2.5.
3. Handling Traffic Jams: The "Ambulance" System
What if the referee (the leader) gets stuck?
- Old Way: Everyone waits for a timeout, then panics and picks a new referee. This wastes time.
- Sei Giga (Ambulance): The system has a "rigged race." The main referee tries to finish first. But, if they are slow, the other runners (backup leaders) have already been doing useful work in their own lanes. If the main referee fails, the system doesn't start from scratch; it just picks up the work the backups already did. It's like having a backup driver ready to take the wheel instantly without stopping the car.
4. Stopping "Cutting in Line" (MEV & Censorship)
In blockchain, "MEV" (Maximal Extractable Value) is like a VIP who bribes the traffic cop to let their car cut in line ahead of others, stealing value from regular drivers.
Sei Giga's Fix:
- Socialized Tips: In the old system, if you paid a "tip" to a specific cop, that cop got rich. In Giga, tips are pooled. Everyone who helps keep the highway running gets a share of the tips, regardless of which lane their car was in. This removes the incentive for cops to let specific cars cut in line just for a bribe.
- Duplicate Handling: If a user sends the same transaction to 10 different lanes to ensure it gets in (censorship resistance), the system only executes it once. The user gets a refund for the extra copies. This prevents users from accidentally flooding the system while still keeping them safe from censorship.
5. The Secret Sauce: Sedna (Private Data Delivery)
Sending a transaction to everyone to ensure it gets in is like shouting your bank account number in a crowded room. It's safe, but everyone hears it, and people might try to steal your value before you even move.
Sedna is a new way to send data:
- Instead of shouting the whole message, you break the message into puzzle pieces and hand them to different people.
- No single person sees the whole message until enough pieces are collected to solve the puzzle.
- This keeps your transaction private from "MEV bots" (thieves) until the very last second, without slowing down the highway.
6. The Warehouse: Storage
Old blockchains store data like a giant, tangled tree (Merkle Tree). Every time you add a leaf, you have to redraw the whole tree. It's slow and messy.
Sei Giga uses a Flat Key-Value Store (like a giant, organized spreadsheet).
- It writes data directly to a log, like a receipt printer.
- It keeps the "hot" (frequently used) data in fast RAM (like a desk drawer) and moves old data to a cold, cheap archive (like a basement).
- This makes reading and writing data incredibly fast, even when the system is processing petabytes of data.
7. Future-Proofing: The Quantum Shield
The paper addresses a future threat: Quantum Computers. These super-computers might one day break the digital locks (signatures) we use today.
The Plan:
- Before the "Quantum Day" arrives, users can register a new, unbreakable "Quantum Key" for their accounts.
- Once the deadline passes, the old locks are thrown away. Only accounts with the new Quantum Keys can move their money.
- This ensures that even if a quantum computer wakes up, it can't steal your funds because you've already upgraded your lock.
Summary
Sei Giga is a blockchain upgrade designed to be fast, fair, and massive.
- It separates ordering from checking to remove bottlenecks.
- It uses parallel lanes instead of a single leader to handle huge traffic.
- It pools rewards so no single validator can manipulate the system.
- It uses puzzle-piece data (Sedna) to keep transactions private.
- It prepares for Quantum Computers by allowing early key upgrades.
The goal is to make the blockchain feel as fast and reliable as the internet we use today (Web2), but with the security and fairness of a decentralized system.
Drowning in papers in your field?
Get daily digests of the most novel papers matching your research keywords — with technical summaries, in your language.