MEV stands for "Miner Extractable Value." It refers to the profit or value that can be extracted by miners or other participants in decentralized blockchain networks, particularly in the context of blockchain-based decentralized finance (DeFi) applications.

In blockchain networks, transactions are grouped into blocks, and miners are responsible for validating and adding these blocks to the blockchain. They are typically rewarded with newly minted cryptocurrency tokens and transaction fees. However, in addition to these rewards, miners have the ability to influence the order of transactions within a block and include or exclude specific transactions.

MEV arises from the fact that miners can manipulate the order and content of transactions to their advantage and potentially extract additional value from the system. They can front-run transactions, which involves placing their own transactions ahead of others to exploit price discrepancies or profit from anticipated trades. They can also perform other strategies like sandwich attacks or back-running, which involve strategically placing and timing transactions to exploit market conditions.

MEV has become a prominent topic in blockchain research and discussions as it highlights the economic incentives and potential vulnerabilities within decentralized systems. Various projects and protocols are working on solutions to mitigate the negative effects of MEV, improve fairness, and enhance the security and efficiency of decentralized finance ecosystems.

Good and Bad Effects of MEV

MEV can have both positive and negative effects within decentralized blockchain networks. Let's explore both sides:

Positive Effects of MEV:

Incentivizes miners: MEV can provide additional financial incentives for miners, as they have the opportunity to extract extra value from the system. This can attract more miners to participate in securing the network, potentially increasing its overall security and resilience.

Liquidity provision: MEV strategies such as arbitrage or front-running can contribute to improved market liquidity. By exploiting price discrepancies, traders can facilitate the efficient allocation of assets and help maintain tighter spreads between different markets, benefiting overall market efficiency.

Negative Effects of MEV:

Unfair advantage: MEV can give certain actors, particularly miners or well-connected participants, an unfair advantage over other users in decentralized systems. This can undermine the principles of decentralization and fairness, as those with greater resources or technical expertise can manipulate transactions and profit at the expense of others.

Market manipulation: MEV strategies like front-running or back-running can be used for market manipulation purposes. This can result in price manipulation, unfair trading practices, and loss of trust in the decentralized finance ecosystem. It can also create an environment where participants hesitate to engage in transactions due to concerns about their orders being exploited.

Security risks: MEV strategies can potentially introduce security vulnerabilities into decentralized systems. Malicious actors may attempt to exploit transaction reordering or other MEV techniques to compromise the integrity of smart contracts, steal funds, or disrupt the network's operation.

To mitigate the negative effects of MEV, ongoing research and development efforts are focused on developing solutions like improved transaction ordering mechanisms, MEV-resistant consensus algorithms, and decentralized governance structures that promote fairness and transparency in blockchain networks.

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Introduction
In the vast, virtual landscapes of the internet, a modern-day gold rush is taking place. But rather than wielding picks and shovels, the miners in this rush are armed with powerful computers and a mastery of cryptography. This is the world of Bitcoin mining, a critical process that not only introduces new Bitcoins into circulation but also maintains the security and trustworthiness of the entire Bitcoin network.
What is Bitcoin Mining?
Bitcoin mining is often misunderstood, conjuring images of digital picks hacking away at virtual rocks. However, the reality is both more complex and fascinating. Bitcoin miners are not treasure hunters but guardians and record-keepers of the blockchain, Bitcoin’s public ledger. They perform a dual role: processing transactions and securing the network through a process called "proof of work."
Why Mining?
The necessity of Bitcoin mining stems from a unique challenge digital currencies face: double-spending. Double spending occurs when a digital currency is spent twice, a risk inherent to digital information because it can be duplicated with ease. In the physical world, if Alice gave Bob a $5 bill, she would no longer possess it. Digital currencies, however, require a robust system to confirm that each unit of currency is unique and not merely a perfect digital copy.
The Mining Process
Miners listen for transaction broadcasts on the network and compile these into a list, or 'block.' Each block contains a complex mathematical puzzle that requires considerable computational power to solve. The puzzle involves guessing a number, known as a 'nonce,' that when combined with the data in the block and passed through a hash function, produces a hash output that meets specific criteria.
The Role of Miners
Miners are the executors of these tasks, verifying the validity of transactions by ensuring that bitcoins are not spent twice and that the transaction adheres to the network’s protocols. This verification process requires miners to check the transaction's digital signatures and confirm that the inputs have not been previously spent.
The Reward System
The first miner to solve the block’s puzzle earns the right to add the block to the blockchain. In doing so, they are rewarded with newly minted bitcoins—this is known as the block reward. Additionally, miners earn transaction fees paid by users seeking priority for their transaction processing. This incentivizes miners to continue their work even as the block reward decreases over time.
The Future of Mining
As more bitcoins are mined and more transactions are recorded, mining becomes progressively more difficult, requiring more sophisticated technology and greater electrical power. This increasing difficulty ensures the network remains secure but also raises concerns about the environmental impact of Bitcoin mining.
Conclusion
Bitcoin mining is an essential mechanism that drives the operation and security of the Bitcoin network. It is a complex blend of technology, economics, and cryptography, representing a radical shift from traditional monetary systems. As the network grows and evolves, so too will the processes that maintain its functionality and security.
Saif Abusrour

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Mining cryptocurrencies like bitcoin could be done using quantum computers, cutting their electricity use by 90 per cent.

Quantum computers could be used to mine existing cryptocurrencies like bitcoin or future, more energy-efficient ones, slashing their electricity use, according to two new analyses.

Cryptocurrencies that rely on a “proof of work” method perform computationally intensive calculations to produce new coins and certify transactions, at great energy cost. Some networks have moved to less power-hungry techniques, like Ethereum’s “proof of stake”, but bitcoin, the world’s largest cryptocurrency, still runs on proof of work and consumes 0.5 per cent of electricity globally.

The Evobits “farm” in Romania mines the Ethereum and Zilliqa cryptocurrencies Akos Stiller/Bloomberg via Getty Images

Now, two proposals suggest that quantum computers might be able to help cut this energy use.

Adapting cryptocurrency schemes to run on quantum computers is tricky, says Gavin Brennen at Macquarie University in Sydney, Australia, because the computational speed-up offered by such machines can make it too easy to solve the problems that networks like bitcoin rely on to prove work has been done.

“This really changes the dynamics of the network,” says Brennen. “So, we were looking for a way to use quantum devices and be faster and more energy efficient, but that wouldn’t distort the consensus dynamics too much.” Such distortion could affect the value of the cryptocurrency.

Brennen and his team have proposed using a kind of quantum computer called a boson sampler to create a new cryptocurrency network, which should be a more energy-efficient alternative when run on quantum hardware.

For two people on the network to agree on something, which is required to certify transactions or mine currency, they both must prove they have performed true boson sampling, which involves measuring a sample of photons that have passed through a labyrinth of mirrors and beam splitters. Classical computers can’t accurately make these measurements above a certain number of photons.

To allow the scheme to work, Brennen and his team had to modify traditional boson sampling by making the photon measurements less exact, because the chance of two people getting the same combination of measurements was so improbable. This is needed so people can verify a solution. By placing the values of the measured photons in ranges, it becomes more likely that two quantum miners will get the same result, says Brennen.

The approach is theoretical, but Brennen and his team are working on a real-world implementation of the scheme on quantum devices.

If quantum computers come to threaten the encryption that cryptocurrencies rely on to be secure, this method could be a useful alternative and save energy too, says Mark Webber at UK start-up firm Universal Quantum.

Machines capable of boson sampling don’t need to be full-blown quantum computers, but could still cost thousands of pounds, which might deter bitcoin miners from migrating, says Carlos Perez-Delgado at the University of Kent, UK. Instead, he and his colleague Joseph Kearney, also at the University of Kent, have come up with an alternative.

The pair analysed how much energy might be saved if we used quantum computers to mine cryptocurrencies. They found potential annual savings of almost 127 terawatt-hours, about 90 per cent of bitcoin’s estimated energy consumption, or equivalent to Sweden’s annual energy budget.

To do this, they compared the energy cost of a commonly used bitcoin mining processor with the estimated cost of using three different quantum computers. Two were hypothetical machines that can correct errors to varying degrees and one was a current, error-prone device – these are known as noisy intermediate-scale quantum (NISQ) computers. They ran a form of what is called Grover’s algorithm to do the mining.

“It is a matter of when, not if, NISQ bitcoin miners will be used,” says Perez-Delgado. “The first person, company or entity to figure out how to cost-effectively develop custom-built NISQ crypto-miners will have a tremendous mining advantage.”

It is interesting to do these energy estimates, says Webber, but it is unclear whether this form of Grover’s algorithm might work on all quantum machines.

He would also like to know if future, fully error-corrected quantum machines would take longer to perform computations – due to time that would need to be devoted to checking errors – and thus use more energy than has been factored in here. Another issue is whether the intense cooling required to keep future quantum computers functioning might make their energy use higher than expected, he says.

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