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Understand double spending and how to prevent attacks

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Understand double spending and how to prevent attacks

What is double spending?

Double spending means spending the same cryptocurrency or blockchain token more than once. Cryptocurrency is a token that represents value on a distributed ledger, so without proper mechanisms, it would be easy to change a ledger entry and give you back the amount you spent.

Double spending isn’t just limited to cryptocurrency; is a problem in all blockchain projects. Here’s more information about this problem, how to fix it, and some steps you can take to avoid being a victim of it.

Key points

  • Double spending is the ability to spend the same token more than once.
  • Double spending is a feature of cryptocurrencies and tokens where ledger entries are maliciously altered.
  • The proof-of-work mechanism, encryption method, and distributed consensus techniques used by Bitcoin and other blockchains prevent double spending.
  • Ethereum and other blockchains use proof of stake, cryptography, and distributed consensus to prevent double spending.

Understanding double spending

Cryptocurrencies and blockchain it had been in development for many years before the introduction of Bitcoin. One of the many reasons they didn’t work until Bitcoin was that a problem needed to be solved: a user could change information on a distributed ledger to return all spent tokens to themselves.

This is a weakness in any digital money system, which is why third-party auditors have traditionally been involved. These auditors must spend time, which equals money, verifying transactions and amounts between parties. For this system to work, there must be trust among all parties involved that auditors, records managers, or other parties will not change entries to benefit themselves or others.

Prevent double spending

The solution presented by Satoshi Nakamoto, which involved timestamping transactions and linking them using cryptographic techniques, solved the double-spending problem. However, for this solution to work, a large and fast distributed network is needed to prevent malicious actors from altering transactions. Popular cryptocurrencies like Bitcoin and Ethereum are large enough to prevent double-spending attacks against the network, but individuals should still be cautious.

People using or investing in cryptocurrency should ensure that they do not accept unconfirmed transactions. Due to awareness of these attempts, many wallet creators program wallets that do not allow the acceptance of unconfirmed transactions. However, it’s best to check and make sure your wallet displays this information or prevents you from accepting one.

Double-spending attacks

The most significant double-spend risk for blockchains is a Attack at 51%.which can occur if one entity controls more than 50% of the hashing power or validation mechanisms on a network.

If this user, or users, take a majority of the network, network participation, or any other mechanism used, they will be able to dictate transaction consensus and control the allocation of currency. New or forked cryptocurrencies with smaller networks are susceptible to this attack. In cryptocurrency networks like Bitcoin, this is very unlikely due to the number of participants in the network and the speed at which the network operates.

Ethereum uses a betting mechanic, where only users who have locked large amounts of ether in smart contracts can become validators and propose blocks. To attempt this attack, a group or entity would have to control more than 50% of the Ether staked on the network – a very expensive endeavor because it takes 32 ETH (about $95,200 as of May 15, 2024) to establish a node, and there is also a mechanism that burns the tokens of dishonest validators.

Race attack

Racial attacks, also called unconfirmed transactions, occur when an attacker attempts to send two quick transactions, one to a recipient and one to the blockchain. That to a recipient could transfer them a token, but the transaction sent to the network would keep it in the sender’s possession. This is an attempt to exploit network delay, with the sender’s transaction confirmation establishing ownership.

This can be easily avoided by not accepting unconfirmed transactions.

Finney attack

A Finney attack, named after Hal Finney, the developer who reported the weakness, is a type of attack on unconfirmed transactions. However, this attack requires a miner to create a block and send an amount to two addresses owned by him. Another transaction is sent to another party in the same block. If the recipient accepts it before it is confirmed by the network, the sender can essentially return the amount sent and spend it again.

This attack is very rare on large blockchains but can be prevented by not accepting unconfirmed transactions or using a wallet that doesn’t allow you to accept them.

Attack of the Sibyl

A Sybil attack occurs when multiple nodes are created in an attempt to gain influence over a network. It looks like a 51% attack, but it’s on a smaller scale. Sybil attacks can be seen as precursors to 51% attacks.

Is double spending illegal?

Whether double spending is illegal depends on the circumstances. As for a cryptocurrency with market value, it is illegal because it commits fraud.

However, double spending is not limited to cryptocurrency. For example, imagine that a gaming community has created a blockchain to facilitate its voting processes, where one blockchain token represents one vote. The token has no monetary value and is not a cryptocurrency.

The players want to organize an event but are divided on where to do it. A vote seems like the best way to resolve the divide, so they vote. If someone initiated a double spending attack and changed people’s votes, those members’ tokens would be spent twice and the result would not be representative of the true result of the vote. This is generally not illegal, but it is unethical within the gaming community and may violate their terms of membership.

What is the meaning of double spending?

Double spending is the act of using the same digital currency or token more than once.

What is an example of a double spending problem?

Double spending alters a transaction on a blockchain or distributed ledger so that a spent token can be spent again.

How did Bitcoin solve double spending?

Satoshi Nakamoto’s Bitcoin solution consisted of using an encryption algorithm, distributed consensus, proof of work to validate transactions, and timestamps over a large, fast network.

The bottom line

A double-spending attack is an alteration in the functioning of a blockchain that allows the attacker to use a token more than once. Most often it is thought to be a cryptocurrency problem, but it can occur on blockchains and distributed ledgers.

Users can prevent a double-spending attack by not accepting unconfirmed transactions. Smaller networks are prone to double-spending attacks, so it is better to use cryptocurrencies and blockchains with larger networks.

The comments, opinions and analyzes expressed on Investopedia are for informational purposes only. Read ours warranty and exclusion of liability for more information.

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Blockchain Technology Will Transform Water Access and Management Globally

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Blockchain Technology Will Transform Water Access and Management Globally

Disclosure: The views and opinions expressed here are solely those of the author and do not represent the views and opinions of the crypto.news editorial team.

Access to clean water is a basic human need, yet billions of people around the world still struggle to get it. According to the World Health Organization, over 2 billion people live in countries suffering from severe water stress, and this number is expected to continue to grow due to climate change and population growth.

Traditional water management systems have struggled to address these challenges, often hampered by inefficiencies, lack of transparency, and misallocation of resources. Blockchain technology offers a promising solution to these challenges, providing equitable access and sustainable use of this crucial resource.

The current state of water management

Water management today faces several pressing issues. Inefficiencies in water supply, distribution, and use, coupled with a lack of real-time monitoring, often result in resource waste and misallocation. Many water sources fail to realize their full potential due to infrastructure and financing shortfalls. For example, the Environmental Protection Agency (EPA) report indicated that the United States would need to invest $625 billion over the next 20 years to repair, maintain and improve the country’s drinking water infrastructure due to aging pipes and other infrastructure problems. Additionally, in the United States alone, household leaks can to waste nearly 900 billion gallons of water per year nationwide. This is equivalent to the annual domestic water consumption of nearly 11 million homes.

Furthermore, corruption and mismanagement of water resources can cause unequal distribution, with disadvantaged communities often bearing the brunt of water scarcity. For example, South Africa is struggling with myriad challenges to its water security: drought, inadequate water conservation measures, outdated infrastructure, and unequal access to water resources. The country faces significant water scarcity, with demand expected to outstrip supply by 2030, creating a projected gap of 17%.

Furthermore, the global water industry is highly monopolized, with a few key players controlling a significant share of the market. These companies exert substantial influence over the water supply chain, often prioritizing profit over equitable distribution and environmental responsibility. This concentration of power can lead to inflated prices and limited access for vulnerable populations. The global bottled water market alone is projected to reach $509.18 billion by 2030, with these large companies capturing a significant share of revenue. This monopolization exacerbates existing inequalities in water access and highlights the need for more decentralized and community-driven water management solutions.

Source: Grand View Search

The potential of blockchain in water management

Blockchain technology can address these issues by providing a transparent, secure, and decentralized platform for water resource management. This approach offers several advantages:

  • Transparency and accountability. Blockchain’s immutable ledger ensures that all transactions and data entries are transparent and cannot be changed once recorded. This transparency can reduce corruption and ensure that water resources are allocated fairly and efficiently. For example, blockchain can be used to track water usage from source to end user, providing a clear record of how water is distributed and used. This level of transparency can help hold authorities accountable and manage water resources sustainably.
  • Efficient resource management. Blockchain can facilitate the creation of smart contracts, which are self-executing contracts with the terms of the agreement written directly into the code. These contracts can automate water distribution based on real-time data, directing water to where it is needed most. For example, smart contracts could be used to manage urban water supply systems, automatically adjusting water distribution based on real-time consumption patterns and demand. This can help optimize water use, reduce waste, and ensure that households and businesses receive the right amount of water at the right time.

In Dubai, the Dubai Electricity and Water Authority (DEWA) has implemented a blockchain-based smart water network initiative as part of its broader smart city strategy. This project integrates blockchain technology with IoT sensors to monitor water usage in real time, manage distribution, and detect leaks. The decentralized ledger ensures data integrity and transparency, enabling more efficient water management and reduced waste. DEWA’s initiative aims to improve sustainability and resource management in the rapidly growing city, highlighting the potential of blockchain to support urban water management and conservation efforts.

Community participation and ownership

Through blockchain, individuals can directly control and monetize their access to water resources, eliminating the need for third-party intermediaries. This direct control model allows local communities to make collective and transparent decisions about their water use. By managing their water directly from the source, communities can tailor water management practices to their specific needs, promoting equitable distribution and encouraging a sense of accountability and stewardship.

Additionally, future models could allow people to monetize their access to water through web3 technologies. For example, a community-to-business (C2B) model could allow people to sell water directly to companies. In this model, people do not have to own the water directly, but can profit by staking their tokens during event sales pools. This approach not only supports sustainable water management, but also creates economic opportunities for community members. Additionally, a “Burn to Secure” protocol can be used to provide water allocation rights. This protocol provides a true sense of water security and financial opportunity by allowing people to redeem their rights. This system not only secures future water allocations, but also increases token scarcity and value.

Additionally, a pure sense of investment is achieved through investments in water sources. This leads to potential financial returns and dividends by addressing the inefficiencies in water supply mentioned above. By investing to finance infrastructure projects, such as building factories and improving distribution systems, more water can be brought to communities, creating additional economic opportunities.

Monetizing water access through the C2B model, the “Burn to Secure” protocol, and investments in water sources all generate economic benefits for the community, promoting a more equitable and efficient water management system.

Overcoming challenges

While blockchain technology has the potential to improve water management, there are challenges to its adoption. The complexity of blockchain systems and the need for technological infrastructure can be barriers, especially in developing regions. Additionally, there are concerns about the significant energy consumption of blockchain networks. However, technological advances and the development of more energy-efficient blockchain solutions are helping to alleviate these concerns. Additionally, education and capacity building are key to ensuring stakeholders understand how to effectively use blockchain technology. Governments, NGOs, and private sector partners need to work together to provide training and support to communities and water management authorities.

Blockchain technology offers a practical and effective means to improve water management. In addition to addressing inefficiencies, blockchain empowers communities, promotes sustainable practices, and opens up new economic opportunities through models like community-to-business (C2B). As we face the growing challenges of climate change and population growth, blockchain is not only an innovative solution, but represents a fundamental shift in the way we manage and value water resources. Adopting blockchain in water management is essential to creating a sustainable and equitable future by changing the way we interact with and protect our most vital resource.

Jean-Hugues Gavarini

Jean-Hugues Gavarini

Jean-Hugues Gavarini is the CEO and co-founder of LAKE (LAK3), a real-world asset company leveraging blockchain technology to decentralize access to the global water economy. LAKE aims to ensure access to clean water for all, protect water resources, and deliver water to those in need through innovative technologies. Jean-Hugues has a diverse career spanning the luxury, fashion, and footwear industries. His career path includes notable successes at Mellow Yellow, Cremieux, and Tod’s. Raised between Silicon Valley and the French Alps, Jean-Hugues has always been immersed in technology and freshwater resources. In 2018, Jean became the CEO of Lanikea Waters, a water solutions entity based in the French Alps. In 2019, the concept of LAKE was born, embodying his commitment to innovation and sustainability.

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Blockchain and AI Expo 2024

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Blockchain and AI Expo 2024

With rapid advances in the world of AI and blockchain, there are opportunities to leverage the security and transparency features of blockchain to improve the reliability and trust of AI systems and data transactions.

Explore the synergy of these advanced technologies in virtual mode Blockchain and AI Expowhich takes place on October 31, 2024 TO 10:00 GMT.

The event features cutting-edge presentations led by leading experts in evolving fields. Presentations are set to explore opportunities and challenges in the fusion of blockchain and AI, real-world applications, ethics, innovations in environmental sustainability, and more!

Gain a comprehensive understanding of how these technologies can synergistically drive innovation, optimize operations, and promote strategic growth opportunities. Develop your knowledge to facilitate informed decision making and give your company a competitive edge in the growing technology landscape.

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Nigeria Eyes National Blockchain Nigerium for Data Sovereignty

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Nigeria round sign Futuristic satellite view of the world

Nigeria is keeping an eye on a new native blockchain network to protect the country’s data sovereignty.

According to local media, a team from the University of Hertfordshire has proposed the new blockchain, Nigeriato the National Information Technology Development Agency (NITDA).

Chanu Kuppuswamy, who leads the team, argued that relying on blockchain networks whose developers are located in other regions poses national security risks to the Nigerian government. He further said that Nigerium would allow the West African nation to customize the network to meet specific needs, while also promoting data sovereignty.

In his presentation, Chanu cited the recent migration of Ethereum to test of participation (PoS) consensus as an instance in which no Nigerians were involved but whose impact is far-reaching.

“Developing an indigenous blockchain like Nigerium is a significant step towards achieving data sovereignty and promoting trust in digital transactions in Nigeria,” he said.

While receiving the proposals in Abuja, NITDA’s Kashifu Abdullahi acknowledged the benefits a local blockchain would bring to Nigeria, including increased security of citizens’ data.

However, a NITDA spokesperson later clarified that Nigerium is still at the proposal stage and that the government has not yet decided whether to proceed or not.

“The committee is still discussing the possibility with stakeholders. Even if a decision is finally made, there is no guarantee that the name will be Nigerium,” the spokesperson told the media.

Nigerium’s reception in the country has been mixed. Some, like financial analyst Olumide Adesina, To say the network is “dead on arrival”. He believes the Nigerian government’s poor record in following through on its big technology plans will claim another victim. He pointed to the eNaira as a missed opportunity whose chances of success were much higher than those of Nigerium.

Others welcomed the proposal. Chimezie Chuta, who chairs the renewed The Nigerian Blockchain Policy Committee is “extremely optimistic“that Nigerium will be more successful than eNaira.

Speaking to a local news agency, Chuta stressed that eNaira failed because the central bank initiated the project on its own, without involving any stakeholders.

“They just cooked it and expected everyone to like it. [With Nigerium]there will be a lot of collaboration,” he said.

Registration of property title, digital identity and Certificate Verification are among the use cases that Nigerium is expected to initially target. However, Nigeria has already made progress in some of these fields through public blockchains.

SPPG, a leading school in governance and politics, announced in May the country’s first blockchain certificate verification system. Built on the The BSV BlockchainIt was developed in collaboration with the blockchain data recording company VX Technologies and local lender Sterling Bank.

Watch: The Future Has Already Arrived in Nigeria

Youtube VideoItalian: https://www.youtube.com/watch?v=M40GXUUauLU width=”560″ height=”315″ frameborder=”0″ allowfullscreen=”allowfullscreen”>

New to blockchain? Check out CoinGeek Blockchain for Beginners section, the definitive guide to learn more about blockchain technology.



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Cambodian CBDC Developer to Build Palau Bond Market on Blockchain: Report

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Cambodia’s CBDC developer to construct bond market for Palau on blockchain: report

A Japanese fintech developer will build a blockchain-based bond market gateway for Palau, aiming to launch a trial in 2024 and a full launch the following year.

Japanese fintech developer Suramitsubest known for developing a central bank digital currency (CBDC) for Cambodia, is intended to build a Blockchain-gateway to the bond market based on the Pacific island nation of Palau, Nikkei He learned.

Soramitsu won the contract and plans to introduce the market on a trial basis in fiscal 2024, with a full launch scheduled for the following year, allowing the Palauan government to issue bonds to individual investors and efficiently manage principal and interest payments, according to the report.

The total cost of the project is estimated at several hundred million yen ($1.2 million to $5.6 million), less than half the cost of a non-blockchain alternative, people familiar with the matter said. The project has reportedly received support from Japan’s Ministry of Economy, Trade and Industry, with Japan’s foreign and finance ministries providing strategic and management advice on the project.

Soramitsu’s successful development of Cambodia’s CBDC in 2020 has boosted its reputation, with the digital currency’s popularity soaring, with over 10 million accounts opened by December 2023, representing 60% of Cambodia’s population. Following this, Cambodia’s central bank governor Chea Serey indicated intends to expand the reach of its CBDC internationally, particularly through collaboration with UnionPay International, the Chinese card payment service, and other global partners.

While Soramitsu’s work in Cambodia has been well received, the long-term popularity of CBDCs remains to be seen. As of late June, crypto.news reported a sharp drop in activity in India’s digital currency, the e-rupee, after local banks stopped artificially inflating its values.

According to people familiar with the matter, the Reserve Bank of India managed to hit the 1 million retail transaction milestone last December only after the metrics were artificially infiltrated by local banks, which offered incentives to retail users and paid a portion of the bank’s employees’ salaries using the digital currency.

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