Merge pull request #53 from eth-protocol-fellows/main

update week 2, add recordings

docs/eps/presentations/week2_notes.md

@@ -0,0 +1,125 @@
+# Week 2 Lecture
+
+## Overview
+
+### Block Validation
+
+go
+func stf(parent types.Block, block types.Block, state state.StateDB) (state.StateDB, error) {
+    if err := core.VerifyHeaders(parent, block); err != nil {
+            // header error detected
+            return nil, err
+    }
+    for , tx := range block.Transactions() {
+        res, err := vm.Run(block.Header(), tx, state)
+        if err != nil {
+                // transaction invalid, block is invalid
+                return nil, err
+        }
+        state = res
+    }
+    return state, nil
+}
+
+func newPayload(execPayload engine.ExecutionPayload) bool {
+    if , err := stf(..); err != nil {
+        return false
+    }
+    return true
+}
+
+https://github.com/ethereum/go-ethereum/blob/63aaac81007ad46b208570c17cae78b7f60931d4/consensus/beacon/consensus.go#L229C23-L229C35
+
+### Block Building
+
+go
+func build(env Environment, pool txpool.Pool, state state.StateDB) (types.Block, state.StateDB, error) {
+    var (
+        gasUsed = 0
+        txs []types.Transactions
+    )
+    for ; gasUsed < env.GasLimit || !pool.Empty(); {
+        tx := pool.Pop()
+        res, gas, err := vm.Run(env, tx, state)
+        if err != nil {
+            // tx invalid
+            continue
+        }
+        gasUsed += gas
+        txs = append(txs, tx)
+        state = res
+    }
+    return core.Finalize(env, txs, state)
+}
+
+### State Transition Function
+* walkthrough go-ethereum
+
+### EVM
+
+* arithmetic
+* bitwise
+* environment
+* control flow
+* stack ops
+    * push, pop, swap
+* system
+    * call, create, return, sstorge
+* memory
+    * mload, mstore, mstore8
+
+### p2p
+
+* execution layer operates on devp2p
+* devp2p => sub-capability eth/68, eth/69, snap, whisper, les, wit
+* eth/1 -> eth/2 -> eth/6.1 -> eth/6.2 
+
+#### Responsibility
+
+* historical data
+    * GetBlockHeader
+    * GetBlockBodies
+    * GetReceipts
+* pending transactions
+    * Transactions
+    * NewPooledTransactionHashes
+    * GetPooledTransactions
+* state
+    snap
+
+    R1      -> 
+   / \
+  x   x
+ / \ / \ 
+a  b c  d
+
+    R200      -> 
+   / \
+  1   2
+ / \ / \ 
+r  a c  d
+
+^^^ contiguous state retrieval
+
+R200
+
+a b c d
+
+
+"healing phase"
+
+* get R200 -> (1, 2)
+* get 1 -> (r, a)
+
+r a c d
+
+* get 2 -> (c, d)
+
+"healing done"
+
+
+#### Start snap
+
+* start weak subjectivity-checkpoint -> block hash
+* get block associated with hash
+* start snap against block's state

docs/eps/week2.md

@@ -2,11 +2,12 @@
 
 During the second week, we will dive into the Execution layer of Ethereum. 
 
-Come to see the presentation by [lightclient](https://twitter.com/lightclients/) on [Monday, February 26, 4PM UTC](https://savvytime.com/converter/utc-to-germany-berlin-united-kingdom-london-ny-new-york-city-ca-san-francisco-china-shanghai-japan-tokyo-australia-sydney/feb-26-2024/4pm). 
+Watch the presentation diving into EL internals with Lightclient on [StreamEth](https://streameth.org/watch?event=&session=65dcdef0a6d370a1ab326de1) or [Youtube](https://www.youtube.com/watch?v=pniTkWo70OY). The overview document is available here. 
 
-Watch the talk stream here: https://streameth.org/65cf97e702e803dbd57d823f/epf_study_group
+[recording](https://streameth.org/embed/?playbackId=70f6rq6un48dy74q&vod=true&streamId=&playerName=Execution+Layer+Overview+%7C+lightclient+%7C+Week+2 ':include :type=iframe width=100% height=520 frameborder="0" allow="fullscreen" allowfullscreen')
+
+For archive of the discussion during the talk, check [this thread](https://discord.com/channels/1205546645496795137/1210292746817110027/1210292751158222848) in our [Discord server](https://discord.gg/epfsg). 
 
-Join our [Discord group](https://discord.gg/epfsg) to ask questions and participate in discussion during the talk. 
 
 ## Pre-reading
 
@@ -58,5 +59,14 @@ Additionally, you should read through the following documents to prepare for the
 
 ## Additional reading and exercises 
 
+- https://www.evm.codes/
+- https://github.com/ethereum/go-ethereum
+- https://github.com/ethereum/consensus-specs
+- https://github.com/ethereum/execution-specs
+- https://github.com/ethereum/devp2p
+- https://github.com/ethereum/execution-apis
 - https://blog.ethereum.org/2022/01/24/the-great-eth2-renaming
 - https://blog.ethereum.org/2021/11/29/how-the-merge-impacts-app-layer
+- [How The Execution Client and the Consensus Client Can Work Together](https://www.youtube.com/watch?v=91-GArv6lKo)
+
+Lightclient's vim and shell setup https://github.com/lightclient/dotfiles