It has become possible to say that the metaverse is a great opportunity for investment and trade, as it provides massive financial returns. The metaverse is the next evolution in social connection and the successor to the mobile internet. Non-fungible tokens represent the ownership of unique items in the metaverse and allow the creator to tokenize things like art, real estate, and collectibles. Trading NFT in the metaverse faces challenges, including security, fraud, and scams. Those challenges have negatively affected the stability of this market. “How can NFT trading in metaverse be improved?” is the main question of this thesis to overcome the challenges. The author performed a systematic literature review to survey and explore the possibility of using technologies to reach the ideal use of NFT in the metaverse. The systematic literature review will guide the researcher to gain more information to evaluate it in the research area. Furthermore, Pointing and identifying the gaps and knowledge needed between the research elements. Three main challenges are presented (identity verification, fraud, and ownership) in areas in which technologies that can provide (flexibility, reliability, accuracy, and performance) can apply. Three dominant solutions, smart contracts, oracle nodes, and blockchain are the study and analysis results to realize the research question and identified problem. The elected technologies show an ability to address challenges in different ways and thus maintain the security and effectiveness of trading operations. Also, the result section mentions other solutions not counting on the dominant solutions. Open issues which provide a ground for future research with practical implementations are also discussed.

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The implementation of smart contract technology with their plausible applications in a business to business are explored. The thesis work shows how Blockchain technology works on the concept of decentralized system which is beneficial to eliminate the need for central authority. The thesis focuses on elimination of challenges pertaining to the selected departments in an organization. The thesis resolves challenges pertaining to lack of transparency, traceability and significant time-delays while in the process of decision making. The influence of blockchain technology and smart contract technology to eliminate these challenges are discussed. Logic of the smart contract and working of the blockchain pertaining to a specific industrial case study are demonstrated. Methodology to set up a smart contract interface in a business to business setting is investigated in this thesis. An observation study has been done in order to show how transparency, traceability and time delay in decision making is achieved by using smart contract interface. This thesis also shows how the blockchain and smart contract technology tries to implement coordination theory.

Ethereum is one of the top blockchain platforms that represents this second generation of blockchain technology. However, the security vulnerabilities associated with smart contracts pose significant risks to confidentiality, integrity, and availability of applications supported by Ethereum. While several studies have enumerated various security issues in smart contracts, only a handful have identified the factors that determine the severity and potential of these issues to pose significant risks in practice. As its first contribution, this thesis presents a framework that identifies such factors and highlights the most critical security threats and vulnerabilities of Ethereum smart contracts. To achieve this, we conduct a comprehensive literature review to identify and categorize the vulnerabilities, assess their potential impact, and evaluate the likelihood of exploitation in real-life contracts. We classify the identified vulnerabilities based on their nature and severity and proposed mitigation recommendations. Our theoretical contribution is to establish a correlation between the security vulnerabilities of smart contracts and their potential impact on the security of smart contracts by identifying factors that pose a (practical) threat. Our practical contribution involves developing a tool based on staticanalysis that can automatically detect at least one critical securityissue with the highest threat factor. For the target vulnerability, wechoose the usage of input from external users without any validation.This vulnerability, as we call it, Missing Input Validation (MIV), actsas a root cause for further (well-known and well-researched) issues,for instance, the flow of tainted values into sensitive operations suchas the transfer of cryptocurrencies and self destruct instruction. Weimplement the tool MIV Checker and evaluate its efficacy on a test setof 36 smart contracts. Our evaluation results show that MIV Checkercorrectly detects 87.6 % of instances of MIV in the dataset.

Smart contracts are software systems that monitor and control the execution of legal contracts to ensure compliance with the contracts' terms and conditions. They often exploit Internet-of-Things technologies to support their monitoring functions, and blockchain technology to ensure the integrity of their data. Ethereum and business blockchain platforms, such as Hyperledger Fabric, are among the most popular choices for smart contract development. However, there is a substantial gap in the knowledge of smart contracts between developers and legal experts. Symboleo is a formal specification language for legal contracts that was introduced to address this issue. Symboleo specifications directly encode legal concepts such as parties, obligations, and powers. This thesis proposes a tool-supported method for translating Symboleo specifications into smart contracts. Its contributions include extensions to the existing Symboleo IDE, the implementation of the ontology and semantics of Symboleo into a reusable library, and the Symboleo2SC tool that generates Hyperledger Fabric code exploiting this library. Symboleo2SC was evaluated with three sample contracts. Experimentation with Symboleo2SC shows that legal contract specifications in Symboleo can be fully converted to smart contracts for monitoring purposes. Moreover, Symboleo2SC helps simplify the smart contract development process, saves development effort, and helps reduce risks of coding errors.

Real estate is one of the largest assets in the world, but it is also synonymous with low liquidity. Tokenization of real estate emerged in the era of real estate 4.0 as technological innovation to counter the low liquidity, long and expensive transaction process, and high entry threshold of the real estate industry. By Fractionalization, tokenization of real estate reduces the required capital that investors need. It is also based on blockchain and smart contract technology, which provides open and transparent information and greatly improves transaction efficiency. However, tokenization also faces the problems of low demand and insignificant economic benefits.The purpose of this study is to investigate the economic performance of publicly traded real estate tokens in the US market and the application prospects of tokenization in China. The results of this study indicate that real estate tokens always have higher returns than market portfolios, although sometimes it is not obvious. And accordingly, real estate tokens have higher risks, although these risks are mainly from themselves rather than the market. Even if tokenization can play an important role in promoting the reform of China’s real estate industry, there are still big obstacles to its promotion in China, including profitability, policy, financing needs, and risks. Therefore, it is difficult to be widely promoted in China in the short term.In the future, more accurate conclusions about economic performance can be drawn based on a larger historical data set of real estate tokens. In the case of continued above-market economic performance, if China’s real estate market is actively transformed, and legislation and technology have been improved, real estate tokenization can be widely applied in China and further promote the reform of China’s real estate industry. / Fastigheter är en av de största tillgångarna i världen, men det är också synonymt med låg likviditet. Tokenisering av fastigheter uppstod i en tid präglad av fastigheter 4.0 som en teknisk innovation för att motverka den låga likviditeten, långa och dyra transaktionsprocessen och höga ingångströskeln för fastighetsbranschen. Genom fraktionering minskar tokenisering av fastigheter det kapital som krävs för investerare. Den är också baserad på blockchain och smart kontraktsteknologi, som ger öppen och transparent information och avsevärt förbättrar transaktionseffektiviteten. Men tokenisering möter också problemen med låg efterfrågan och obetydliga ekonomiska fördelar.Syftet med denna studie är att undersöka den ekonomiska prestandan för börsnoterade fastighetstokens på den amerikanska marknaden och tillämpningsmöjligheterna för tokenisering i Kina. Resultaten av denna studie indikerar att fastighetspoletter alltid har högre avkastning än marknadsportföljer, även om det ibland inte är uppenbart. Och följaktligen har fastighetstokens högre risker, även om dessa risker huvudsakligen kommer från sig själv snarare än marknaden. Även om tokenisering kan spela en viktig roll för att främja reformen av Kinas fastighetsindustri, finns det fortfarande stora hinder för marknadsföring i Kina, inklusive lönsamhet, policy, finansieringsbehov och risker. Därför är det svårt att bli allmänt befordrad i Kina på kort sikt.I framtiden kan mer exakta slutsatser om ekonomisk prestanda dras baserat på en större historisk datauppsättning av fastighetstokens. I fallet med fortsatt ekonomisk prestation över marknaden, om Kinas fastighetsmarknad aktivt omvandlas och lagstiftning och teknik har förbättrats, kan fastighetstokenisering tillämpas allmänt i Kina och ytterligare främja reformen av Kinas fastighetsindustri.

Yes / Insurance claims processing involves multiple entities and data sources, necessitating communication between human agents. Consequently, vehicle insurance claims have traditionally required significant human effort and time. Daily vehicle-related transactions, including those managed by transportation authorities, pose challenges for tracking. Centralised systems have been utilised for national solutions, but trust management, transparency, and access control issues arise. There is potential for further integration of vehicle-related transactions. This article proposes a blockchain framework for vehicle insurance to streamline the reporting of accidents and filing of insurance claims. Blockchain-based automation platforms can enhance the scale and response time of claims processing, providing users with control over additional transactions, inspection, and insurance. For experimental purposes, a blockchain was created using Hyperledger Fabric to store information about vehicles, owners, and insurance. Efficient querying of this blockchain requires specific participants, assets, and transactions. The consensus algorithm can identify invalid claims if a transaction request contains an error. By deploying blockchain technology and smart contracts, this architecture has the potential to address trust and security concerns associated with traditional insurance policies and claims.

Every time the development of technology enters a new epoch, big changes inthe business and society will follow. Especially for the entrepreneurs, it signifies both opportunities and challenges at the same time. In the next decade, IoT, AI and blockchain will be the main driving forces in the upcoming technological revolution and demonstrate great synergic potential. There is an old saying, “In a strong wind even turkeys can fly”. The company who can seize this chance may become to the next GAFAs (Google, Amazon, Facebook and Apple); whereas those who completely ignores it may be rolled out of the marketeventually. Business model canvas is a very popular method for startups to align the resources and formulate the strategy, which is also the framework used in our research. The main target of this thesis is to demonstrate a thinking method to converge these new technologies in the business models and evaluate the most significant elements in the business planning stage. It could help the future startups to take advantages of the opportunities and overcome the challengesin the new business environment.

Sharing commodities such as vehicles and houses in exchange for a fee has become very popular in the recent years. Companies such as Uber and Airbnb are two examples where their users can rent their underutilized assets for a period of time. This approach relies in the need of a trusted and centralized third party service provider which introduces security and privacy risks. Specifically, users’ personal data can be collected and misused by the service provider while at the same time the system is more vulnerable to a Distributed Denial of Service attack. In this thesis, a protocol namely CarGo, is presented and aims to allow car owners to rent their cars in a decentralized, secure and private way. Furthermore, this thesis presents a Proof-of-Concept on the Ethereum, Arbitrum and Optimism blockchains where a Solidity smart contract is utilized for automatic execution of car booking and payment functionalities. The solution ensures security and privacy of the booking details and offers safeguards against malicious behavior. Furthermore, with the deployment of the smart contract in layer two blockchain solutions the transactional fees have been greatly reduced. / Delning av tillgångar som bilar och hus mot en avgift har blivit mycket populärt på senare år. Företag som Uber och Airbnb är två exempel där användarna kan hyra sina underutnyttjade tillgångar under en period. Denna approach bygger på behovet av en pålitlig och centraliserad tredjepartstjänsteleverantör, vilket innebär säkerhets- och integritetsrisker. Specifikt kan användarnas personliga data samlas in och missbrukas av tjänsteleverantören samtidigt som systemet är mer mottagligt för Distributed Denial of Service-attacker. I denna avhandling presenteras ett protokoll, nämligen CarGo, som syftar till att tillåta bilägare att hyra ut sina bilar på ett decentraliserat, säkert och privat sätt. Dessutom presenterar denna avhandling en Proof-of-Concept på Ethereum, Arbitrum och Optimism-blockchain där en Solidity smart contract används för automatisk utförande av bilbokning och betalningsfunktionalitet. Lösningen säkerställer säkerhet och integritet för bokningsdetaljerna och erbjuder skyddsåtgärder mot illvilligt beteende. Dessutom har med implementeringen av smart contract i layer two blockchain-lösningar transaktionsavgifterna reducerats betydligt.

In recent years, blockchain has received more attention in different areas wheredifferent chains show unique properties. Society has been strongly affected by thegrowth of technology and digitalization. Despite the success, the banking system is ina stagnant state in the development of the transaction system. Smart contracts havemore significant potential to be used against blockchain. The contract does not requiremanual handling but could operate independently during all hours of the day. Inaddition, limit them by being applied solely to enable an overview of completedtransactions. A challenge seen with implementing the technology from the bank'sperspective is a new type of form of cooperation. If Ethereum succeeds in proving itselfin its Proof of stake model, there is great potential for a more significant part of thebanking industry to start using smart contracts. The purpose of the study was toinvestigate the effects of implementing smart contracts in a dynamic transaction systemover time. Data obtained from interviews and literature study was the basis formodeling the system. The study aimed to carry out simulations to then be able toevaluate the effects. According to the interviews, blockchain is seen more as a tool tosolve particular problems. The simulations show how the entities in the system areaffected over time when the technology smart contracts are applied.