# Summary: Scaling Ethereum & Multichain DeFi (Bancor x Polygon)
**URL:** https://gov.bancor.network/t/summary-scaling-ethereum-multichain-defi-bancor-x-polygon/3494
**Category:** Community Chatroom (DISCUSSION)
**Created:** [March 28, 2022, 6:35am UTC](https://gov.bancor.network/t/summary-scaling-ethereum-multichain-defi-bancor-x-polygon/3494 "2022-03-28T06:35:19Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@bungeegum](https://gov.bancor.network/u/bungeegum)
#### Post date: [March 28, 2022, 6:35am UTC](https://gov.bancor.network/t/summary-scaling-ethereum-multichain-defi-bancor-x-polygon/3494/1 "2022-03-28T06:35:19Z")
Hi fellow Bancorians! I’ve summarized a conversation on Twitter Spaces between Hamzah Khan of Polygon and Mark Richardson of Bancor. Hope it will be of use as a tl;dr and start discussion about the collaboration!
Link to the Bancor tweet here: [https://twitter.com/Bancor/status/1506048622940475394](https://twitter.com/Bancor/status/1506048622940475394)
Speakers:
@\_khanhamzah – Head of DeFi @0xPolygon
@MBRichardson87 – Product Architect and Head of Research @Bancor
Polygon as one of the first scaling solutions
- Made scaling a possibility and accessible to all
- Was at the center of both the DeFi craze → NFT and gaming craze
Polygon scaling products
- Began with MATIC plasma chain in 2017 → POS chain mainnet launched in April 2020
- Goal is adoption for millions, which cannot be done with just POS chain, and plasma chain has similar problems to optimistic rollups (more below)
- ZK rollups from Starkware, Polygon Hermez and zkSync getting ready during this time, providing near “infinite scalability” and Ethereum-level security → Polygon saw ZK as the future
Should Bancor deploy on POS chain or Hermez?
- POS chain has most traction with many blue-chip protocols (Aave, Balancer, Compound, Opensea)
- For now, best to deploy on POS, then copy-paste / port onto Polygon Hermez (ZK EVM)
- Hermez = ZK rollup of Ethereum running alongside POS chain, team is led by Jordi Baylina (1 of 2 people who saved ETH from theDAO hack)
Difference between scaling solutions
1. Hermez: first decentralized ZK solution
2. Miden: VM to be plugged into any ZK implementation
3. Zero: focused on speed, uses Plonky2 (fastest ZK proof – 0.2s on MacBook Air)
4. Nightfall: privacy-focused ZK solution
- All of these solutions will be L2, which means same level of security as Ethereum
Clarifications to common misconceptions
- With rollups, Ethereum will be different, faster, cheaper
- L2s were advertised this way, but truth is these are chains work side by side and share the burden of Ethereum by dragging projects off the main chain
- Polygon POS chain as a side chain
- It is somewhat a hybrid between a side chain and L2 because MATIC staking and checkpointing is done on Ethereum, not Polygon POS chain
Competition in L2
- Polygon has been in the space for longest and over time realized that optimistic rollups will not scale because of the 7-day withdrawal period (bad UX)
- Optimistic rollups will still have their place in the near future - easy to port projects (ZK = scalability and the future, Optimistic = simplicity and short term)
- Polygon is fully committed to Ethereum – Ethereum is where most, if not all, innovation is taking place, which is then copied to other chains
Bridging
- Polygon POS bridge – 3rd most used Ethereum app (after Opensea and Uniswap v2) and so far, no funds have been lost in past years
- Works by consensus of 2/3 of 100 validators on Ethereum – which takes time, especially during Ethereum congestion
- Alternatives are centralized bridges or relayers (at users’ discretion)
**Q&A:**
Regaining lost confidence for Polygon users
- Bug bounties are in place to explore and expose exploits, securing the chain for the future
- Technical and security team talent has been beefed up recently and will work hard to minimize these risks
ZK rollup timeframe
- Still in early stage relative to optimistic rollups, but significant progress has been made with Hermez testnet launched next month
Difference to other ZK rollups
- EVM compatibility (Starknet/Starkware and zkSync are centralized)
- EVM was not made for ZK, so Hermez is built from the ground up as an entirely new EVM
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### Author:  [@glenn](https://gov.bancor.network/u/glenn)
#### Post date: [March 28, 2022, 7:35pm UTC](https://gov.bancor.network/t/summary-scaling-ethereum-multichain-defi-bancor-x-polygon/3494/2 "2022-03-28T19:35:55Z")
Hi @bungeegum,
Thanks for this post. FYI, there is a discussion about deploying Bancor on Polygon happening here as well:
> [@Proposal: Deploy Bancor on the Polygon Blockchain](https://gov.bancor.network/t/proposal-deploy-bancor-on-the-polygon-blockchain/3351):
>
> For this proposal to pass, it requires a 35% quorum and 66.7% supermajority. TL;DR Polygon offers unparalleled liquidity utilization, single-staking, and native IDLE Finance – thereby allowing protocol’s BNT-staking to reach maximum efficiency. Native Polygon protocols that allow for different allocation strategies to be implemented on single-staking mechanisms, could maximize returns for both the Bancor protocol and LPs. Introduction to Polygon Polygon is a protocol that looks to build and c…