# Cosmos Newsletter
**URL:** https://forum.cosmos.network/t/cosmos-newsletter/2677
**Category:** Miscellaneous
**Created:** [September 4, 2019, 7:48am UTC](https://forum.cosmos.network/t/cosmos-newsletter/2677 "2019-09-04T07:48:33Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@MichelleL](https://forum.cosmos.network/u/MichelleL)
#### Post date: [September 4, 2019, 7:48am UTC](https://forum.cosmos.network/t/cosmos-newsletter/2677/1 "2019-09-04T07:48:33Z")
A reposting of the Cosmos Hub and Spoke newsletter. If you want to receive it and other updates and announcements, subscribe on the Cosmos website.
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### Author:  [@MichelleL](https://forum.cosmos.network/u/MichelleL)
#### Post date: [September 4, 2019, 8:12am UTC](https://forum.cosmos.network/t/cosmos-newsletter/2677/2 "2019-09-04T08:12:40Z")
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Welcome to the Cosmos Community Newsletter!
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**COSMOS HUB AND SPOKE HIGHLIGHTS: SEPTEMBER 2019**
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50K prize pool at the Cosmos sponsored DeFi Hackathon during SF Blockchain Week
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Cosmos at Blockchain Week Berlin highlights
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Get involved: New Cosmos community security session
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Development updates: Ethermint, Cosmos SDK, IBC and Tendermint Core
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Cosmos-Hub 3 governance proposal underway
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What's new in the Cosmos contributor ecosystem
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We are hiring!
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**DEFI HACKATHON @ SAN FRANCISCO BLOCKCHAIN WEEK **
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San Francisco is up next in early November with San Francisco Blockchain Week and the Cosmos sponsored DeFi Hackathon. Apply [here](https://hackathon.sfblockchainweek.io/ "here") to hack for the $50K prize pool.
The details:
- When: Nov 1–3, 2019
- Where: Terra Gallery
- Prize pool: $50,000 valued in ATOMs + other sponsors’ prizes
- Hacker slots: 400+
- Cosmos blog post “[DeFi Hackathon is Coming to SF Blockchain Week](https://blog.cosmos.network/cosmos-hackatom-is-coming-to-sf-blockchain-week-95bfdd3ce21c)”
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**COSMOS @ BERLIN BLOCKCHAIN WEEK**
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This past week blockchain took over Berlin with over 80 having taken place. Chris Goes took to the stage at the Interoperability Summit with Keep Network, MakerDAO, Messari, Polkadot and Ramp Network answering cross-chain asset questions and presenting on “Demystifying IBC.” Plus a great discussion on shared security and sovereign security.
- Click [here for the recording](https://www.facebook.com/FactoryBrln/videos/517642082308732/ "here for the recording")
- Link [to the presentation](https://docs.google.com/presentation/d/1qtYeNWuqbqz2y2PZ9oHUtKxWYMM1Kvo8uq4Ndr-QatA/edit?usp=sharing "to the presentation")
ETHBerlin hackathon closed out the week with the Cosmos team onsite. We added some additional stake to the libp2p category and ChainSafe provided some [interesting development](https://github.com/ChainSafe/go-libp2p-noise "interesting development").
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**COSMOS DEVELOPMENT UPDATES**
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**Cosmos SDK**
Inter-block cache: An I/O improvement to applications built upon the Cosmos SDK which allows for each KVStore to maintain a inter-block (persistent) cache. The inter-block cache allows for values that are frequently read but not written to be more quickly accessed (e.g. module parameters). Draft issues [#4748](https://github.com/cosmos/cosmos-sdk/pull/4748)
NFT module has been merged. Further improvements and updates are still underway so it should be considered a WIP until further notice.PR: [#4209](https://github.com/cosmos/cosmos-sdk/pull/4209)
Transaction gas estimation improvement means applications will automatically estimate gas for you before submitting it, open issue [#4938](https://github.com/cosmos/cosmos-sdk/issues/4938)
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Interesting gas price related discussion on the [forum](https://forum.cosmos.network/t/gasprice-do-we-want-low-gas-price-for-the-hub/2635)
**Inter-blockchain Communication**
Just released, the latest version 1.0.0-rc2 of the IBC specification. It has been tagged and awaits review [here](https://github.com/cosmos/ics/blob/v1.0.0-rc2/spec.pdf).
**Tendermint Core**
We have created an issue to track our 6 month objectives, you can read them [here](https://github.com/tendermint/tendermint/issues/3900), if you would like something included in this list, please leave a comment and we can see if it can be added. The interchain foundation has begun a rust implementation of [Tendermint](https://github.com/interchainio/tendermint-rs). The next minor release will be v0.32.3 and it will include:
• swagger API docs
• privval refactoring
• bugfixes and minor improvements
If you would like to use rust to build an application now, we have a [Tendermint Rust ABCI implementation](https://github.com/tendermint/rust-abci), that is ready to be used.
**New Tendermint Developer Sessions:**
The team recently released a video discussing [fork accountability](https://www.youtube.com/watch?v=Jph-4PGtdPo&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv). Three part series on Tendermint Lite Client:
- [Part One](https://www.youtube.com/watch?v=C6fH_sgPJzA&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=4)
- [Part Two](https://www.youtube.com/watch?v=gTjG7jNNdKQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=3)
- [Part Three](https://www.youtube.com/watch?v=whyL6UrKe7I&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=2)
**Ethermint with ChainSafe**
Github repository under active [development](https://github.com/ChainSafe/ethermint), below is an itemized list of recent developments in the project.
_Completed development:_
- Connected StateDB to EVM module Keeper to allow queries and txs to access Ethereum State
- Connected web3 RPC API to Ethermint CLI and implemented some RPC queries
- Updated CosmosSDK version to LTR 0.36.0
- Implemented key generation for Ethereum specific keys to sign Ethereum transactions
- Framework set up for EVM module
_Upcoming development:_
- Implement remaining RPC endpoints
- Complete handler logic for updating state from Ethereum transactions
- Implement queries and txs through EVM module as an alternative to the web3 API
- Complete EVM module to be usable in CosmosSDK applications
- Update keeper and any additional data store to be able to perform all RPC requests/ transactions
- Include state updates at the start and end of Tendermint blocks to replicate Ethereum state transition
**Cosmos Community Security Hours**
We will be hosting Cosmos community security hours every two weeks. You can find all the information on the [Cosmos forum page.](https://forum.cosmos.network/t/cosmos-community-security-office-hours/2615)
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**EVENTS **
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September 11th-12th: Jae Kwon is speaking at [Coindesk - Invest: Asia 2019](https://www.coindesk.com/events/asia-2019)
- September 12th: San Francisco Cosmos [meetup with Lino and Agoric](https://www.meetup.com/Cosmos_SF/events/263758474/ "meetup with Lino and Agoric")
- September 18th: GoSF meetup [Scavenging for Reusable Code in Kubernetes Code + Consensus Algorithms](https://www.meetup.com/golangsf/events/261627019/)
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**COSMOS CONTRIBUTOR UPDATES**
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- Governance: The voting period has [started for the Cosmos-hu](https://cosmos.bigdipper.live/proposals/14)b 3
- New post: Evaluating different development kits for your application you want to build? The team at [TruStory explains why they chose to build on the Cosmos SD](https://blog.cosmos.network/building-a-decentralized-app-with-cosmos-sdk-3c535cdc6a6a)
- Podcast - Validator [Chorus One’s Q&A](https://blog.chorus.one/agoric-qa-transcript/ "Chorus One’s Q&A") with Mark Miller and Dean Tribble from Agoric, one of the lead projects behind inter-blockchain communication
- Video - Part 1: [Distributed Programming for a Decentralized World with Mark Miller, Agoric, and Protocol Labs.](https://www.youtube.com/watch?v=52SgGFpWjsY)
- Permaculture Podcast with [Regen Network](https://www.thepermaculturepodcast.com/2018/1828/)
- Play the newest game on Ethereum, [Clovers Network](https://clovers.network/ "Clovers Network"), also launched by a Cosmos contributor
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**We are hiring! [See what positions are available](https://tendermint.bamboohr.com/jobs/)**
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