# Notarization and Anti-Plagiarism: A New Blockchain Approach
## 4 Comparative Analysis
### Anti-Plagiarism Blockchain-Based Apps  
PlagioScanner [53] offers an anti-plagiarism service mainly aimed at university students for thesis verification. By uploading a file, it performs verifications anonymously using both web and database system support and costs EUR 0.33 per page to analyze. PlagioScanner service is able to analyze up to 40 pages in 6 min and offers users a complete and downloadable report in which are indicated the parts of text liable to plagiarism. It also supports up to 129 different languages. PlagioScanner does not offer any additional features or services compared to those identified as desirable. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & **Noberasco** & **BCH Notary** & **ChainSign** & **Certo** & **Quadrans** & **Dedit** \\ \hline Web site & [32] & [33] & [35] & [39] & [46] & [48] \\ Supported Blockchains & BTC & BCH & EOS & Ardor NXT & Quadrans & Algorand \\ File Custody Service & NO & NO & NO & NO & NO & YES \\ Hash Custody service & YES & YES & YES & YES & YES & YES \\ P2P File Custody Service & NO & NO & NO & NO & NO & NO \\ Free Space Size & NO & NO & NO & NO & NO & 10 MB \\ Type of Archive Server 1  & NO & NO & NO & NO & C \\ Notarization Report (PDF) & NO & NO & NO & YES & YES & YES \\ Custom Notarized File Template & NO & NO & NO & NO & NO & NO \\ Multiple Digital Signatures & NO & NO & NO & NO & NO & YES \\ File Sharing & NO & NO & NO & NO & NO & YES \\ Massive File Upload & NO & NO & NO & NO & NO & NO \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Notarization apps features. ZeroPlagio [54] also aims to be a university-focused anti-plagiarism app. The supported anti-plagiarism system works both via web and via database. The anti-plagiarism service offered is anonymous and costs EUR 0.33 for each uploaded page. It also supports up to four different languages and provides a detailed report in PDF format. ZeroPlagio does not support any other features or services. Among the different services offered by Grammarly writing assistant [55], there is also a plagiarism checker service [56] that works on uploaded files by the users. The antiplagiarism service offered by Grammarly is only supported by a web verification system. It does not use a database. It also supports three languages for antiplagiarism checks and provides a PDF report for the user. Grammarly Plagiarism Checker does not have costs based on the amount of text to be translated but has subscription plans that start at USD 12 per month. It does not offer other services. Dupli Checker [57] allows one to perform antiplagiarism checks either by uploading documents in various formats or by using a URL of a web page. The verification system supports web mode only. Checks are performed in seven languages and return a PDF report to the user. In terms of costs, Dupli Checker provides subscription plans with limitations on the number of search queries and the number of total words. No additional functionality is provided. Plagiarism Checker [58] uses only a web-based verification system (no database). Plagiarism checking is performed in several ways. You can upload a document in one of the supported formats, or you can paste plain text directly on the web page, or you can connect to a Dropbox account. The system provides support for anti-plagiarism checks in 21 different languages and provides an anti-plagiarism report in PDF format. From the cost point of view, Plagiarism Checker offers several subscriptions and customizable plans, starting from 10 USD/month, with limitations on search queries, immediacy of PDF reports, batch searches, and use of additional side features (e.g., citation assistant, text comparator, and URL text comparator). It does not offer additional features and/or services. In the following table, we made a checklist of the desirable features for each anti-plagiarism app considered. Table 2 shows that all the systems analyzed support the use of the web system for anti-plagiarism analysis. Only PlagioScanner and ZeroPlagio also use a database for more effective plagiarism analysis.