Iskanje po katalogu digitalne knjižnice

Opis: This dissertation introduces a novel off-chain channel model aimed at enhancing existing solutions to address scalability challenges in blockchain technology. It begins with an overview of the problem statement, research objectives, methodology, and potential limitations before establishing a thesis and hypotheses. A comprehensive theoretical background on blockchain technology, scalability solutions, and the off-chain channel approach ensures a common understanding of the topic. To provide a thorough overview of existing off-chain channel solutions and identify and categorize their limitations, we conducted a systematic literature review, identifying 65 relevant studies. Through detailed analysis, six categories of solutions and six implemented off-chain channel solutions were identified. Five primary categories of limitations were also identified: routing, flexibility, privacy, network properties, and online assumptions, some with sub-limitations. To address these limitations, a new off-chain channel model, named ”Off-chain Channel as a Service,” is proposed, featuring four core design decisions: eliminating the need for an off-chain channel network, assuming blockchain properties by design, introducing a trustworthy service, and enabling flexibility by design. Validation and evaluation of the proposed model employ case-study and experiment research methods to confirm compliance with off-chain channel principles, validate it against identified limitations of existing solutions, analyze its impact on blockchain scalability, and assess its applicability across blockchain platforms. For this purpose, two off-chain payment channel prototype solutions have been implemented, each using a different underlying blockchain platform, namely Ethereum and Solana. Moreover, the proposed model’s security evaluation using risk-analysis methodology is also provided. Qualitative and quantitative analysis demonstrates that the proposed off-chain channel model adheres to off-chain channel principles, improves most identified limitations of existing solutions, positively impacts blockchain scalability, and can be applied to different blockchain platforms supported by smart contracts.
Ključne besede: blockchain, distributed ledger technology, smart contracts, scalability, off-chain channel, payment channel
Objavljeno v DKUM: 01.10.2024; Ogledov: 0; Prenosov: 35
Celotno besedilo (3,87 MB)

Opis: Preboj tehnologije veriženja blokov je omogočil oživitev in razvoj pametnih pogodb, ki omenjeni tehnologiji predstavljajo ključno dodano vrednost. Pametne pogodbe so trenutno v fazi zasnove koncepta in s tem sprožajo veliko zanimanje strokovne javnosti. Prav zaradi zgodnje faze v samem razvoju so izoblikovani vzorci dobrih praks razvoja pametnih pogodb in arhitektur decentraliziranih aplikacij, ki temeljijo na pametnih pogodbah, zelo okrnjeni. Ena od ključnih lastnosti tehnologije veriženja blokov je nespremenljivost, ki se odraža tudi na pametne pogodbe. Takšna lastnost lahko predstavlja izvedbene in varnostne težave, saj so pametne pogodbe nezamenljive in hkrati nespremenljive v trenutku, ko so nameščene v omrežje verig blokov. V magistrskem delu predlagamo arhitekturo ekosistema pametnih pogodb, ki bo učinkovito omogočala zamenljivost in nadgradljivost pametnih pogodb na platformi Ethereum. Uporabo predlagane arhitekture smo predstavili na primeru reševanja realnega izziva nadgradnje poslovnega procesa implementiranega s pomočjo pametnih pogodb.
Ključne besede: tehnologija veriženja blokov, pametna pogodba, Ethereum, Solidity, nadgradljivost
Objavljeno v DKUM: 26.06.2018; Ogledov: 5507; Prenosov: 294
Celotno besedilo (1,50 MB)