1,721,133 research outputs found
When Blockchain meets Online Social Networks
Full text linkOnline Social Networks (OSNs) have become one of the most popular application of the daily life of users in the worldwide. Today the number of Social Media users is about 3 billion, and this trend increases year per year with high impact on the privacy issue. During the last years, decentralization of social services has been considered a big opportunity to overcome the main issues in OSNs. Blockchain technology represents today the most well known decentralized technique, which has been taken into account to develop the new generation of decentralized social platforms. Nevertheless, the real benefit of the introduction of blockchain technology in real social platforms is still unknown. In this paper we propose an overview of the main Blockchain-based Online Social Media platforms. We describe in detail these platforms by highlighting the main features and services they offer, but also the common drawbacks of these platforms. Finally, we propose a new model of Blockchain-based Online Social Network, which takes into account the role of the user as the center of the system, instead of the role of the content as in current proposals
An Overview of Blockchain Online Social Media from the Technical Point of View
No full textSocial media is becoming one of the dominant ways to communicate. Before social media, people were extremely limited in their means to interact with others, and they were limited largely to the people that they knew in person. However, this impact on people in real life has damaged privacy. Alternative solutions have been proposed in order to overcome current social media issues. In this direction, blockchain is one of the most promising, and several blockchain-based social media have been proposed. In this paper, we analyze blockchain online social media from the technical point of view in order to understand the current trend of social DApps and to describe which characteristics are important in a blockchain-based social media scenario. We analyze real data by exploiting one of the most well-known DApps sites, and we compare current technologies in order to highlight which ones can be better applied to a real social scenario, such as Facebook
The decentralization of Social Media through the blockchain technology
No full textOnline Social Networks (OSNs) have become one of the most popular applications of the daily life of users in the worldwide. Today, the number of Social Media users is more than 4 billion, and this trend increases year after year with a high impact on the privacy issue. During the last years, decentralization of social services has been considered as a big opportunity to overcome the main privacy issues in OSNs, and not only (fake news, censorship, etc.). Blockchain technology represents today the most well-known decentralized technique, which has been taken into account to develop the new generation of decentralized social platforms. Blockchain-based Online Social Media (BOSMs) are decentralized Social Media platforms that use the blockchain technology as the underlying technology or as a tool in order to provide rewarding strategies. In this tutorial, we will highlight the BOSMs scenario by presenting their main characteristics and how data could be collected and analysed
The social impact of NFTs in the metaverse economy
No full textThe metaverse represents now one of the most promising innovations that lie under the umbrella of Web3-powered technologies. Its societal impact has important repercussions both on social good and on social computing. Among the technologies that are driving the metaverse, we find cryptocurrencies and Non-Fungible Tokens (NFTs) that are used to represent the property of goods and assets in the virtual worlds. In particular, NFTs are used to represent the parcels in which the metaverse is divided, with unknown consequences on the metaverse economy. In this paper, we explore the social impact of employing NFTs in the metaverse and propose an analysis of parcel sales taking Decentraland and The Sandbox as a case study. Our analysis uncovers that prices of the metaverse parcels are increasing over time and that acquiring parcels is becoming prohibitive. Additionally, we identify that the factors that drive the price of sales in the metaverse are the proximity to specific landmarks, like roads, squares, districts, or parcels owned by influencers or enterprises. We argue that this could be a factor in reducing the social good of the metaverse because it fuels a speculative market similar to the one of the physical estate
La tabella delle menomazioni alla integrità psico-fisica comprese tra i 10 e i 100 punti di invalidità ai sensi dell'art. 138 del Codice delle Assicurazioni: riflessioni medico-legali
No full textDelving NFT vulnerabilities, a sleepminting prevention system
No full textThe rise of Non-Fungible Tokens (NFTs) is beginning to revolutionize the digital world thanks to the unique property of these tokens. Indeed, they can represent the ownership of physical or digital assets. They are implemented using smart contracts, therefore if the code of the smart contract contains bugs, an attacker can exploit its vulnerabilities to perform an attack called sleepminting. Sleepminting consists of transferring NFTs owned by an address, without the owner's consent. In this paper, we provide a detailed analysis of the sleepminting attack and, thanks to the insights gained, we propose a prevention system to reduce the number of sleepminting attacks. Our prevention system is based on analysing the transactions included in new blocks, detecting those that are related to sleepminting attacks and keeping track of the addresses that are involved in these transactions. A dictionary-like data structure can be used to keep track of the addresses involved, where the key is the address and the value acts as a counter for the number of times the address is involved in sleepminting. With this information, block-creating nodes can add another verification step before adding a transaction to a block, which consists of blocking transactions when the addresses involved appear in sleepminting attacks a number of times greater than a threshold. The evaluation shows that sleepminting is a relevant phenomenon, and now it involves NFT transfers rather than NFT minting. Our proposed prevention system is able to block up to 87% of attacks
Sleepminting, the brand new frontier of Non Fungible Tokens fraud
No full textNon Fungible Tokens (NFTs) are becoming a standard to represent unique and valuable items, such as a piece of art, a videogame item, or other digital or physical goods, and keep track of their provenance. Thanks to blockchain technology and the power of smart contracts, NFT holders have true ownership over them, because they are the only ones who can transfer them. However, through an attack called sleepminting, an attacker is able to impersonate another person, including an artist, and create NFTs on the artist’s behalf, while still maintaining its possession, leveraging bugs in the code of the smart contract that manages the NFTs. Therefore, the attacker can cheat concerning the provenance of an NFT and then sell the fake NFTs to unaware buyers. In this paper, we propose a study that sheds light on this phenomenon. In particular, we collect over 1.3 million events that are connected to sleepminting and analyse the events under multiple aspects. The study uncovers that, by using the sleepminting attack, some users are able to create fake NFTs of popular brands, and are able to mint them to famous personalities in the NFT field, such as well known artists and collectors
Gioco d'azzardo patologico come raro effetto avverso di terapia anti-Parkinson: quali implicazioni medico-legali ?
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