More from @lightclients

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@lightclients

13 Jan

2021 will be the most innovative year for the Ethereum protocol since 2016. Here are the EIPs to keep an eye on this year (thread):

The next hardfork is named "Berlin" & is scheduled to ship with 4 EIPs:

* EIP-2929: Gas cost increases for state access opcodes
* EIP-2930: Optional Access List Txs
* EIP-2718: Typed Transaction Envelope
* EIP-2315: Simple Subroutines

EIP-2929: Gas cost increases for state access opcodes

Storage accessing opcodes have historically been underpriced & malicious txs which take 20-80 seconds to execute can be created today.

This EIP increases the cost of state accesses by ~3x.

Read 21 tweets

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@lightclients

12 Nov 20

Yesterday's chain split will be cemented in Ethereum's history as an inadvertent hard fork. Let's look at exactly what the vulnerability was & how this transaction exploited it (thread): etherscan.io/tx/0x57f7f9ec3…

I also want to preface that this is completely an outsiders account of the incident & therefore everything posted here is only to the best of my knowledge. I look forward to the go-ethereum team's full disclosure of the vulnerability!

On 2019-11-07, Geth v1.9.7 was released. It contained a few fixes and optimization, including PR #20177 titled "core/evm: avoid copying memory for input in calls".

Read 25 tweets

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@lightclients

1 Nov 20

Geth's transaction pool (aka mempool) can be boiled down to a few key data structures and processes. Transactions are the main building block. They are stored on the heap while references to them populate four objects: "all", "priced", "queue", and "pending".

The "all" object is a mapping of the transaction's hash to the actual transaction object on the heap. It is the canonical source of transactions in the mempool and is used to build (and rebuild) the "priced" object.

The "priced" object is a heap (data structure) that orders the transactions in the mempool highest to lowest priced. When the mempool is completely saturated, "priced" is asked to find the N cheapest transactions so that they can be fully evicted from the mempool.

Read 16 tweets