2020-05-14 Eth2 impl call 39

2020-05-14 Eth2 impl call 39.txt

https://github.com/ethereum/eth2.0-pm/issues/149
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Nimbus:

- Multiple Sync fixes
  - Snappy (add compute issue with Lighthouse’s)
  - can now sync to Schlesi: slowly but steadily
  - working on performance
	  - in particular Windows
  
- Fixed multiple memory leaks
  - libp2p
  - our block caching system
  - added more memory tracking tools
  - will add a status button for our testnets
  - still have an “old libp2p connection” leak
  
Tools:
  - debug discovery
  - debug libp2p topics and message received
  
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BLS change coming soon: https://github.com/ethereum/eth2.0-pm/issues/149

Networking updates

Test vectors updates to catch new corner cases

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BeaconFuzz:
- Found upstream bug in Snappy
- Found infinite loop in Teku
- Stack overflow in Nimbus.
- Refactoring into 3 different tools

Q: on BeaconState being a trusted input
—> Overflow in state_transition == invalid transition
—> One of the reason to split up BeaocnFuzz

https://blog.sigmaprime.io/beacon-fuzz-04.html

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Teku
- Builtin support for Schlesi
- 900MB memory footprint

Lodestar
- Can start syncing Schlesi, 2k epochs

Nimbus

Trinity
- Continuing port to (?) async framework
- Updated to latest BLS API

Nethermind
- 

Prysmatic
- Topaz
- Fixing UX bugs
- Fixing network bugs from multi client testate
- Aligned to 0.11.2
- Working on 0.12
- Optimizing syncing (100 blocks/s, not taking into account signing)
- Slashing service working (1 client with it enabled earned a lot more than the others)


Lighthouse
- Key derivation
- Trail of bits audit: concurrency, slashing
- …
- Great improvement on memory usage
- 300MB for beacon node + 2k validators
- Consensus bug
- Remove parallelisation for state transition code, not needed with batched BLS verif
- Backed the genesis state into the repo
- updated to stable future
- Update done —> ready for Trail of bits
- RPC handling

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Testnets

Afri: Failures mostly due to network fragmentation
- Beacon node rejecting each other for various reason
- Different genesis time between Prysmatic and Lighthouse
- Somehow managed to launched a multi client testnet 2 weeks ago
- Finality was horrible at start due to crashing
- Now almost perfect finality for more than a week

==> will start working on a new testnet, maybe for June

Proto:
- Lodestar 1k epoch 10%
- Nimbus:
  - close to the head, 100 blocks distance but then the sync mode changes and stability issue
  - added on eth2stats
  
==> Danny: coordinated start in June

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Research

Eth1x-64 write up on ethresearch and repo in ewasm.
- https://ethresear.ch/t/the-eth1x64-experiment/7195
- https://ethresear.ch/t/eth1x64-variant-1-apostille/7365

Radical EVM changes will cause issue with existing tooling so might as well drop and chang to EWASM

Vitalik:

Homomorphic encryption for private data
Call to cryptographer for polynomial commitment work
Proof-of-custody, see Dankrad post on ethresear.ch

TXRX:
Mikhail Eth1/Eth2: https://ethresear.ch/t/the-scope-of-eth1-eth2-merger/7362
Fork choice test:
- found a bug in Teku
- based on a “transpiler”

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Networking

Discv5 Felix:
- Working to fix a spec bug (message that seemingly has a wrong encoding)
- Discovery update: how to deal with live network
	- > include with BLS spec update

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Spec update:

Has seen bug reports on phase 1, but not really tested.