Thread by @MrGavinLow

1/15
🧵ZK landscape (Part2) + Diff flavors of Rollups, (ELI5 summary of Rollups)

Quite some updates especially during ETHCC. Will post some notable ones that I come across today before sharing some Rollups' notes I compiled for @ForwardAnalytic

2/15
1) @0xPolygon - zkEVM is here!
TLDR: Build an App on zkRollup without learning a brand new coding language! And take advantage of the fastest ZK tech with #plonky2 by @0xPolygonZero
(Testnet will soon be Live)
blog.polygon.technology/the-future-is-…

3/15
Also since the last tweet of Zk landscape(Part1) 10days ago, #Polygon has nearly doubled 2x their FDV, and caught up with #Starkware.
Polygon's current Valuation is now at $9.1 Billion FDV

https://twitter.com/MrGavinLow/status/1546103161878106113

4/15
@the_matter_labs Will be launching their zkSync 2.0 Mainnet in 100 days!

https://twitter.com/zksync/status/1549757888641437696

5/15
@Scroll_ZKP Doing a re-Alpha Testnet (Early tester can signups here) 👇

https://twitter.com/Scroll_ZKP/status/1549268276152500225

1)Interact with Demo App (Uniswap Fork)
2)View Scroll testnet via BlockExplorer
3)Rollers generate/aggregate proofs
4)Bridge between testnet L1/L2

6/15
Ok so back to the Different *Flavours* #Rollups:

Architectural difference (relationship to settlement/DA Layer ):
- Regular Rollups
- Immutable Rollup
- Enshrined Rollup
- Sovereign Rollups

@apolynya did a very thorough tweet here:

https://twitter.com/apolynya/status/1511623759786307586

7/15
So where does
1) Zero-knowledge Rollup(ZKR)
2) Optimistic Rollup(OR)
falls under?

In short, OR or ZKR are the security linkage models and can be used in any of the categories described in the above model.

ZKR uses Validity Proof
OR uses Fraud Proof (7d Challenge period)

8/15
1)So wads a Regular #Rollup? (e.g Starknet,zksync,Arbitrum,Aztec,etc.)
- Rollups are on L1 chains (e.g Ethereum/other L1s), and they inherit the security of these L1.

Note: L1 supports Smart Contracts (ofc)
Notice, there is a bridge contract on L1... cont...

One example:👇

9/15
Not to be confused with a cross-chain burn&mint #Bridge.
An example of a bridge contract for optimism can be seen here.
research.paradigm.xyz/optimism

10/15
- 2) Immutable Rollups (e.g. Fuel V1).
Smart contracts aren't upgradeable
Pros: no external governance risks
Cons: upgrading requires going through the EIP process & must be redeployed everytime

11/15
- 3) Enshrined rollup
(theoretical concept of changing L1 such that there is no need for smart contracts to realise the rollups.)
No smart contract risk & Governance Risk.
(i.e. technical benefits of L2 Rollups but at L1)
Advantages:
reddit.com/r/ethereum/com…
Cons: Slow

12/15
- 4) Sovereign Rollup(e.g Celestia)
Rollups settle themselves, instead of using an L1 as settlement layer. Uses DA layer purely for Data & Ordering
members.delphidigital.io/media/ethereum…

13/15
Dankrad mentioned, since 4)👆do not have secured bridges(smart contract) on L1(settlement layer), n-squared bridges between these rollups are needed, and thus inefficient. But @jadler0 mentioned how an L2 settlement rollup, with an L3 can sit on top in solves this issue.

14/15
Some summary from @apolynya.
polynya.mirror.xyz/C7pabfX3j8r65w…

That concludes my #Rollups Notes.

Hope to share more Notes in the future. If you like this content, check out my profile and hit #follow, & if u find it helpful, hit RT on 1st post to share the love.

@apolynya post really good technical content too. Recommended follow
15/15

with an L3 sitting on top of it* solves this issue.