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When 620 weary developers emerged after three days of nonstop coding at this years ETHBerlin event last week, few expected Vitalik Buterin to be speaking on stage.

The co-founder and prime architect of Ethereum was a surprise guest.

What was even more surprising were some of his reflections on building the industrys second-largest blockchain. Buterin described some of the regrets he had about the initial design of Ethereum in detail.

For many in the audience, his discourse not only evoked the halcyon days of the networks birth in 2014, but it also helped fill in the road map for what comes next for a cryptocurrency now worth $448 billion.

The US has just approved a spot Ethereum exchange-traded fund, and BlackRock, the worlds largest asset manager, has launched its own tokenised fund on the blockchain.

The Ethereum network has spawned a sprawling ecosystem of developers and financial applications worth more than $63 billion, and it has become a byword for decentralised finance.

Still, Buterin, a 30-year-old Canadian-Russian programmer, said he has a list of things he would have done differently. They range from the development of Ethereums Virtual Machine to smart contracts to the Proof of Stake consensus mechanism.

And he remarked that even as Ethereum goes more mainstream, its still misunderstood.

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Bitcoin has a simple narrative which is digital gold, Buterin said. But like with Ethereum, its like Whoa, what the heck is Ethereum?

Seated on comfy couches on stage with ETHBerlin organisers Afri Schoedon and Franziska Heintel, Buterin opened his chat by sharing his fondest memories of the German capital over the years hacking in the old office with Ethereum co-founders Gavin Wood and Jeffrey Wilcke, launching Devcon Zero, and celebrating the Merge upgrade in 2022.

Then Schoedon popped the question.

With everything you know and everything you learned over the last 10 years, how would you build Ethereum differently today if you could start from scratch? Schoeden asked.

Vitalik Buterin (centre) discussed Ethereum's vision, then and now, in a discussion at ETHBerlin. Photocredit: Liam Kelly/DL News.

Buterins first qualm concerns Ethereums Virtual Machine, which is key to making the network function as a kind of decentralised mega crypto computer.

He explained that Ethereums original EVM design used 256-bit processing instead of 64- or 32-bit.

In computer architecture, the size of computing is measured in bits, with larger bits offering better efficiencies and processing more data. But 256 bits is very inefficient for most operations, and can create a lot of bloat on a blockchain, even for simple tasks.

For a network in its early days, Ethereum didnt need to optimise for this.

The original design was way too overfitted for 256-bit, Buterin told the audience.

Second, Buterin said the early Ethereum developers should have focused on making it easier to write smart contracts with fewer lines of code.

The reason? Added transparency.

With fewer lines of code, he said, people can properly see and check whats going on inside of them.

Volunteers and developers playing music at a hackathon in Berlin. Photocredit: ETHBerlin.

Instead of custom-built computers called miners running nonstop to secure a blockchain network, Ethereum switched to a different model.

Ethereums switch from a Proof of Work consensus mechanism the way nodes in a blockchain like Bitcoins agree on the state of transaction data to Proof of Stake in 2022 should have happened much earlier, Buterin said.

When we switched to Proof of Stake, we should have been willing to switch to a somewhat crappier version of Proof of Stake earlier on, he said. We ended up wasting a lot of cycles on really trying to make Proof of Stake perfect.

Instead of miners, Ethereum is now secured by validators who have staked 32 Ethereum, worth roughly $124,000, to do the same thing and be rewarded for it. If they misbehave by validating fraudulent transactions, for example, they are penalised.

In sum, the switch swapped out raw, energy-intensive computing power with economic incentives.

We could have saved a huge amount of trees if we had a much simpler proof-of-stake in 2018, Buterin said.

From big-money token transfers to backdoor honey pots, users can follow the money quite easily in crypto. Thats thanks in part to automatic logging.

But as the industry advances, notably moving from externally owned accounts like MetaMask to smart wallets like Safe, certain aspects of that crucial logging are lost.

Notably, automatic logs for Ether transfers.

It should have been in there from the beginning, Buterin said. It could have been like 30 minutes of coding from myself, Gav and Jeff. Instead, its an EIP.

Ethereum Improvement Proposals are formal proposals made by developers to change certain aspects of the Ethereum network.

EIP-7708, which Buterin submitted on May 17, would make this precise change.

Ameen Soleimani, strategic advisor at 0xbow and co-founder of MolochDAO and Reflexer Finance, discussing the Tornado Cash case. Photocredit: Liam Kelly/DL News.

Buterin also said he would have used SHA-2 for Ethereums hash function rather than the current function called Keccak.

To understand the difference, one must dig into a bit of cryptography lore, specifically about how SHA-3 became a standard. Remember, before crypto became synonymous with celebrity memecoins and nine-figure initial coin offerings, it was about complicated math.

When Ethereum was being built, the hash it used was in a hash function competition yes, thats a thing.

The National Institute of Standards and Technology organised the competition to create a new hash standard alongside SHA-2.

Previous standards had been attacked and debunked. But SHA-2 was unscathed and the NIST simply wanted a safe alternative. After all, variety is the spice of life (and apparently cryptography).

Keccak was just one of several contestants that entered the competition. During the competition, the team made some minor changes to its algorithms, eventually leading to them being crowned the winner. In other words: SHA-3.

The early Ethereum team had, however, already implemented a non-standardised version of Keccak. Essentially, Ethereum is using a pre-SHA-3 iteration.

Co-founder and CPO of ChainSafe Gregory Markou and founder and CEO of Phylax Systems Odysseas Lamtzidis speaking on stage at ETHBerlin. Photocredit: ETHBerlin

Big whoop, right?

Well, this meant that Ethereum developers needed a custom library collections of reusable code that neednt be rewritten from scratch to accommodate both SHA-3 and Keccak.

Were not compatible with other systems using SHA-3, Marius van der Wijden, a core Ethereum developer, told DL News. We have to support both algorithms in the EVM.

Its essentially been solved. Today, big libraries support both encryption mechanisms.

So, yeah, big whoop indeed.

It doesnt matter in the grand scheme of things, and current development is definitely not impacted by it, said van der Wijden.

Despite the list of minor design misses, Buterin said its inevitable for any project to have a few.

Im just really happy that I feel like our core devs and their execution capacity feels like it just keeps increasing with each passing year, he said.

Were in a position to effectively and safely correct some of these mistakes.

Liam Kelly is a DeFi Correspondent at DL News. Got a tip? Email at liam@dlnews.com.

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Vitalik Buterin reveals five ways he'd rebuild Ethereum from scratch - DLNews