目前，因應不同需求與應用情境的各式電子發票系統已被建立。儘管電子發票系統、區塊鏈技術與其相關的文件及平台已經存在，許多研究學者及廠商仍希望推展此技術並應用於其它領域。 本研究的目的在以區塊鏈技術為基礎建構電子發票平台，希望提出一種區塊鏈技術的新應用情境。首先，透過資訊計量學的方法分析980篇電子發票及區塊鏈的相關文獻以了解電子發票及區塊鏈的發展；接著，探討比特幣(Bitcoin)與區塊鏈(Blockchain)間的重要觀念與技術；最後，利用區塊鏈技術中的一種以太坊(Ethereum)來建立電子發票平台。 本研究中六項建構電子發票系統的需求如資料完整性、可驗證性、可用性、可稽核性、不可否認性與可溯源性可被達成。此架構不僅適用於發行一般的消費性電子發票更適用於向企業提供短期資金借貸如發票融資的應用情境。未來，在不同的實作需求下，將可探討整合區塊鏈另一項技術開放鏈(Openchain)以建立混合公開與私有節點的應用。 / Different e-invoice systems are designed to meet different needs and application scenarios. Although these systems areuseful and readily available, researchers and businesses hope to be able to expand the coverage of e-invoice systems using Blockchain technologies. This study proposes an e-invoice system based on Blockchain technologies which shows anotherapplication scenario of Blockchain technology and e-invoice system. First, a review of about 980 publicationson e-invoicing and Blockchain was carried outwithinformetrics used for further analysis so as to better understandthe development of e-invoice and Blockchain technologies. Second, the concepts and mechanisms of Bitcoin and Blockchain technologies were reviewed. Finally, an e-invoice system based on Ethereumwas proposed. The proposed system meets the six needs of an e-invoice system: integrity, authenticity, availability, auditability, non-repudiation and traceability. It is not only suitable for issuing general invoices but also can play a role in further invoicing applications such as invoice financing as well as agri-food supply chain traceability. In the future, Openchain or hybrid Blockchain infrastructure that combines public and private nodes can be consideredfor use in this proposed e-invoice system.

現行醫療保險理賠申請流程相當繁複，被保險人需要向醫療機構申請診斷證明，填具理賠申請書向保險公司提出理賠申請，再由保險公司進行審核。若遇到無法從診斷書直接審核之個案，保險公司需先取得被保險人簽署之調閱病歷同意書後，方能至醫療機構調閱病歷，以利後續理賠審核。這樣的流程，對保險公司來說，需耗費大量人工成本；對被保險人來說，則也有資訊不夠透明的疑慮。 區塊鏈的運作有著公開透明，且難以造假的不可否認性。智能合約是在區塊鏈平台上執行的協議落實程式，既能確保程式不會被竄改，又可保留所有執行紀錄。若能透過這些特性來做為醫療保險理賠傳遞訊息的媒介，除了能提昇保險公司審核流程的時效性，被保險人也能獲得公開透明的資訊。 本論文提出了一套基於智能合約來實現快速醫療保險理賠的方案，我們在以太坊上實作智能合約，我們的方案除了能改善現有的問題，也建構出一套公開透明，且兼顧病人隱私的理賠系統，並考量實際狀況，讓保險公司的業務邏輯可以重用，在理想與現實之間取得一個適當之平衡點。 / Current medical insurance claims application process is complex. It requires the insured to apply for medical diagnosis, and to fill out an application form to the insurance company. The insurance company then reviews the case. If they are unable to approve the claims, they must first obtain the consent form from the insured in order to access to his or her medical records to facilitate subsequent claims review. Throughout the process, the insurance company needs to pay a lot of labor costs; while the insured will have many concerns of information transparency. Blockchain operates in an open and transparent manner and maintains its data in a tamper-free way. Smart contracts are programs executed on a blockchain platform to enforce an agreement such that the program will not be tampered with, and all records of execution will be kept from modification. These characteristics of a smart contract make it very good as a tool for streamlining the medical insurance claims process, as it will greatly reduce the human efforts involved on the insurance company side while increase the information transparency from the perspective of the insured. This thesis presents a smart contract based solution for streamlining the medical insurance claims process. We design and implement the con-tract on the Ethereum platform. In addition to improving the existing problems, our solution builds an open and transparent claims system that takes into account the patient privacy and the practical requirement of re-using the existing claims processing system of the insurance company, thus achieving a proper balance between the ideal and reality.