Cross-Border E-Commerce Business Model Based on Big Data and Blockchain

In the context of the rapid development of Internet technology, the integration of the world economy has been strengthened. e continuous innovation of technology and foreign trade business forms has promoted the rapid development of cross-border e-commerce (CBE). Based on the research on the development status of CBE, this paper analyzes the reasons for the above problems in the development of CBE and discusses the innovation of CBE business models based on blockchain. Its purpose is to study the CBE business model based on big data and blockchain. is paper proposes to build a CBE framework system based on blockchain. It also uses blockchain technology (BT) to provide solutions to the problems of trust, customs supervision, crossborder payment, cross-border logistics, and cross-border data ow encountered in CBE. According to experimental statistics, China’s CBE exports were 7.29 trillion yuan, an increase of 40.1%, and imports were 3.76 trillion yuan, an increase of 16.5%.


Introduction
In the context of economic globalization and the gradual popularization of Internet coverage in the world, foreign trade is changing from "trade diversi cation" to "global buying, global selling, global payment, and global transportation." e main body of trade has changed from traditional trading enterprises to small and medium-sized enterprises and individuals. e characteristics of transactions have changed from "big in and large out, low frequency" to "small batch, high frequency," and the trade supply chain has changed from nonpersonalized, large scale to a exible supply chain that is personalized and fragmented, and meets customer needs. e form of trade has changed from traditional o ine trade to CBE. CBE transactions involve a large amount of document information. In addition to the need to share such information between trade multilaterals, it also needs to be submitted to regulatory authorities. At present, trade information is scattered in separate systems, and the information lacks transparency. Although each country has speci ed its own EDI data exchange format standard plan, the transmission speed of information is low. Data format conversion costs are high, and it is not easy to form mutual trust.
While CBE is booming, it is also accompanied by some problems. Foremost among them are issues of trust, information opacity, and high costs. Because CBE transactions involve multiple national governments, complex supply chains, and long logistics times, it is di cult to trace the source of product quality problems and accountability is di cult. BT can decentralize, realize information sharing, trace and track commodities, and improve the trust foundation of CBE. e research of blockchain in the eld of CBE application provides a way to promote blockchain to improve business in traditional business elds and provide a way to unify supervision and break the crisis of trust. CBE platform is based on blockchain, information is shared, and platform data can be obtained through technical means, to achieve product traceability, logistics tracking, quality control, and trust in cross-border payment, and through big data analysis, to achieve risk early warning and the credibility evaluation of cross-border enterprises. e innovation of this paper is that (1) it promotes research on the application of blockchain in CBE and its implementation in practical application scenarios; (2) in the CBE industry, the application of BT can change the existing business model of CBE; it allows all participants to have an equal dialogue, reduce intermediate transaction links, reduce costs, and improve corporate profits; (3) it promotes the change of trade type. Blockchain-based CBE can keep in touch with end consumers, transforming the traditional model of relying on large-value imports and exports into a small-value transaction model and promoting the development of CBE.

Related Work
Teresa Ballestar research segmentation is based on customers' commercial activities and roles in the social network of the website [1]. In the absence of any clear regulatory policies, Indian e-commerce businesses appear to be enjoying a free market and growing rapidly. e Tyagi study found that India's leading e-commerce companies are growing in a policy vacuum, allowing 100% foreign direct investment under a "market model" [2]. With the popularization of the Internet and smartphones, Internet-based e-commerce has developed rapidly with its unique advantages. Hu research finds traditional and improved businessto-customer (B2C) e-commerce [3]. Although existing research links the emergence and development of e-commerce to various aspects, it does not address technology and platform acceptance from a legitimacy-building perspective. In Kwak's research, legitimacy is divided into market legitimacy, relational legitimacy, and social legitimacy. He also explores the link between legitimacy and acceptance of each. While Alibaba's intellectual property weaknesses are exposed, Alibaba's continued efforts to establish legitimacy have fueled the platform's growth [4]. e Monroe study aims to describe this growth and explore the factors that influence the magnitude and timing of the growth. From 2000 to 2015, the average annual growth rate of B2B e-commerce in the USA exceeded 10%. After a slow start in previous years, growth was strong between 2003 and 2005 [5]. PJW survey explores e-commerce logistics business models from unstructured big data [6]. E-commerce plays an increasingly important role in transforming the mode of economic development, promoting industrial upgrading, and promoting the modernization of circulation. On the one hand, e-commerce has broken the time and space barriers of trade. On the other hand, it provides rich information resources and unlimited business opportunities for enterprises. Sun M's research found that e-commerce has become a trend leading Vietnam's economic development. In recent years, the online cosmetics industry has gradually emerged in the Vietnamese market. However, due to the unique characteristics of cosmetics such as the largest number of bottles, the requirements for logistics and distribution are higher to ensure the integrity of the product. Meanwhile, in the context of e-commerce, customers are paying more and more attention to the quality of logistics services [7]. Yang proposed a blockchain-based big data sharing and transaction framework. is framework utilizes the idea of decentralization and openness of blockchain to build a big data trading platform for multiple users [8]. Although his research has been greatly applied to the distributed secure storage of big data in the blockchain, there is still a problem of high cost.

Algorithm Design of BBE Supply
Chain Framework e architecture diagram of the prototype system of large-scale cross-border supply chain based on blockchain is shown in Figure 1. It includes foreground, interface layer, service layer, network layer, core layer, and storage layer.
As shown in Figure 1, it solves the pain points faced by the supply chain industry, such as lack of trust, poor information flow, low degree of automation, data fraud, difficulty in accountability, and difficulty in connecting and collaborating with a large number of existing block supply chain systems [9,10].

Blockchain-Based Product Information Traceability Framework.
is facilitates suppliers' information control over product production, transportation, and warehousing [11,12]. Aiming at different entities and business operation processes in the supply chain, and taking into account the various data involved in product information traceability, a multi-level blockchain-based product (BBP) information traceability framework is proposed, as shown in Figure 2.
As shown in Figure 2, on-chain and off-chain data and services are connected through a multi-level blockchain [13,14]. e information encryption model provides a solution for users to disclose data externally. Users can encrypt data according to the degree of privacy of the data. e information anchoring model is used to ensure the global consistency of multi-chain data. e key distribution model is used in many aspects such as user management accounts, external transactions, and enterprise management [15,16]. e product traceability label is used for users to perform online and offline verification and information traceability of product information.

Framework of E-Commerce Supply Chain Based on Blockchain.
is section proposes a blockchain-based e-commerce (BBE) supply chain framework (PIT-EC). Under this framework, it proposes a multi-chain structure to store product, transaction, and logistics information [17,18]. At the same time, the framework provides a reliable, easily monitored, and tamper-proof solution to the problem of traceability of product information. e BBE supply chain framework is shown in Figure 3.
As shown in Figure 3, according to different data characteristics such as data volume, data update speed, and data encryption degree, data items are grouped into different sets [19,20]. 2 Mobile Information Systems

Initial Key Distribution.
e entities of the initial key distribution scheme are as follows: where P is the parent key and C is the next level key generated by P and PC. It is recommended to use an encrypted pseudo-random number generator (CSPRNG).
Collections are defined as follows: It maps these sets to Dict and generates a seed, and seeds are defined as follows:  e master private key obtained by calculation is the initial key (Ik).

Function Key Distribution.
In the key distribution scheme based on ECC, the function key has a strong correlation with the initial key, so that the initial key has all the functions of the account. e initial key is used to generate the secondary key, which has the highest privilege. e specific calculation process is as follows: e user uses the ECC algorithm to calculate the public key of the initial key, as follows: It combines the public key (IK), and the index number refers to the level of functional authority.
e calculation process is as follows: e initial key is used to generate the secondary key, which has the highest privilege. For other keys, according to the depth of the organizational structure, the breadth of the business, and the size of the supervision power, repeat the above steps 2 and 3 to generate keys at all levels in turn.

Key Recall Mechanism.
It then obtains the initial key, i.e., the private key, according to the above method. Initial keys play an important role in key management. ID (x) is defined as follows: Hash(registration number, registered address, legal) representative ⊕user defind word , It maps the initial key (Ik) to an elliptic curve, randomly generates integers r ∈ (1, n−1), and then computes  P � E p (IK), e data that need to be digitally signed are as follows: Dacaccount � addr, Usernp, C1, C2, IDK.

Anti-Counterfeiting Traceability Label
Model. It provides anti-counterfeiting traceability label solutions that link products with real product information. e anticounterfeiting traceability label scheme is shown in Figure 4.
As shown in Figure 4, each product line has a unique code. Each code corresponds to multiple batches of products.

Blockchain-Based CBE Model
In order to demonstrate the advanced nature of the proposed method, experimental verification is carried out, and the experimental environment is shown in Table 1.
As shown in Table 1, it will be divided into four aspects: whether there is a risk of centralization, whether it supports data-based asset operations, whether it supports smart contracts, and whether it is efficient.

Construction of CBE Model Framework Based on
Blockchain. China's trade form and market environment are different from those of overseas. To ensure that CBE maintains a healthy development in the world, the establishment of a trade ecological environment must ensure mutual recognition and uniform standards. e operation model of the traditional CBE model is shown in Figure 5.
As shown in Figure 5, the information sharing and collaboration technology of blockchain use decentralization and consensus to enhance trust. It provides a technical foundation for the establishment of a benign trade ecological environment and can ensure the vigorous development of CBE ecology. e traditional cross-border model is built in a centralized way, and its collaboration model is based on the CBE platform as the central node. Figure 6 shows the cooperation mode of the participants of the CBE alliance based on blockchain.
As shown in Figure 6, the CBE model based on the blockchain can be built into a multi-coordinated platform by using the decentralization, distributed storage, and antitampering features of the blockchain. e parties located on the blockchain platform form a community of interest alliance according to their roles and functions. It participates in the data consensus on the CBE platform and can realize the sharing of the underlying data. In this way, the functional positioning of each participant can be changed, which is conducive to multi-party collaboration, and maintains and promotes the orderly development of CBE.

Characteristics of the CBE Model Based on Blockchain.
e CBE model based on blockchain can promote the diversified collaboration of transaction entities. e supply chain that forms a multi-centralized CBE is very long. It involves commodity producers, buyers, warehousing, logistics, CBE platforms, customs (inspection and quarantine and customs clearance), import and export traders, domestic and foreign consumers, banks, insurance companies and third-party payment institutions, and so on. e position of the participants of CBE in the transaction center reflects the advantages they occupy in the transaction to a certain extent. e centralized value of the blockchain can ensure that the CBE platform is not controlled by any single party, and can take into account the interests of multiple parties in operation. e corporate qualifications, commodity supply chain information, user data, and related business data of traditional CBE are stored in a centralized platform. It is difficult for regulators and consumers to obtain the true picture of a business. Enterprises generally do not share the business data of CBE. ird-party credit assessment agencies do not have enough data to analyze the credit situation of enterprises. e cross-border credit reporting platform based on blockchain is shown in Figure 7.
As shown in Figure 7, after using blockchain, the qualification information, user data, supply chain information, and operation data of the CBE business are stored on the blockchain, which can be real and effective data to give credit rating to each participant of the CBE business under the condition of privacy protection, and the rating can be easily queried by the public. is can protect the honestly operating enterprises and law-abiding consumers, enhance consumers' trust in the CBE business, and also combat nonhonest enterprises, ensure the interests of honest enterprises, and reduce the cost of credit acquisition.

Application Scenarios of Blockchain in CBE.
Blockchain is the underlying data technology. In view of the particularity of CBE, BT can be applied to trace the origin of CBE products, CBE orders, and smart contracts for insurance business, and protect the privacy data of transaction parties. e various scenarios are discussed in detail below.

Product Traceability of CBE.
e categories of goods in CBE are becoming more and more diverse. However, because the supply chain of CBE is long and complex, it is difficult to effectively track the quality and origin of products using traditional methods. If the commodity category is food, once a problem occurs, it will have a great impact on cross-border trading countries and traders, so commodity traceability is necessary in CBE. e blockchain traceability of cross-border commodities uses the data immutability feature of BT. It automatically and directly collects all data of commodities from production to circulation basins through IoT devices and automatically records them on the blockchain to form sharable distributed ledger data. At present, major CBE platforms are trying to use BT to achieve their commodity traceability needs, such as Alibaba's overseas shopping traceability system, Jingdong blockchain anti-counterfeiting traceability platform, and opening up with cross-border logistics systems. e results of the comparative analysis between this method and the existing scheme are shown in Table 2.

Mobile Information Systems
As shown in Table 2, the method in this paper connects the blockchain network based on the cross-chain interoperability model and uses the whole-process trusted closedloop mechanism of cross-chain transactions to ensure the security and trustworthiness of cross-chain transaction execution. It avoids the risk of centralization while ensuring the efficient execution of transactions and can effectively adapt to smart contracts and data-based blockchains. It has the advantages of no centralization risk, supports data-based cross-chain interoperability, supports smart contracts, and operates efficiently, meeting the application needs of supply chain scenarios.

Cross-Border Secure Transactions on Cross-Border
Platforms. Blockchain smart contracts define transaction rules in the contract code in advance. Once the conditions are met, the rules are automatically executed. First, it can improve work efficiency, and second, it can solve the occurrence of contract execution disputes. CBE B2B trade often buys insurance for goods. Using smart contracts, once a claim condition occurs, the claim procedure will be executed automatically, without the need for both parties to intervene. In addition, the process of receiving payments for CBE platform transactions can also be protected by the use of smart contracts, so that when the terms of the transaction are met, the money is automatically transferred to the seller's account; otherwise, it is returned in the same direction.

Application of Blockchain in CBE Supply Chain.
e supply chain of CBE includes product procurement, production, manufacturing, sales, logistics, warehousing, and other links. e supply chain is long, and the scenarios are complex. It introduces blockchain, 5G, and IoT technologies to provide a full range of services for CBE. e combination of blockchain and cross-border logistics can bring logistics and supply chain participants onto a   Mobile Information Systems decentralized blockchain platform, opening up the information flow between domestic logistics companies, international transport, and overseas logistics companies, so that buyers, sellers, insurance companies, and other interested parties can quickly and accurately locate the logistics trajectory of goods on the platform and quickly determine liability when losses are caused by logistics problems. e combination of blockchain and cross-border supply chain finance takes advantage of the decentralization, openness, transparency, and immutability of BT. It integrates the transaction data of upstream and downstream enterprises of CBE and forms a complete transaction record to prove the authenticity of accounts receivable. At the same time, the smart contract is used to stipulate the payment path, and the four-flow integration and relatively closed operation of business flow, information flow, logistics, and information flow are realized. At the same time, it can also obtain better financial support from the bank.

Development Characteristics of CBE.
With the development and innovation of ICT such as the Internet, the global e-commerce business has developed rapidly. e number of people participating in online shopping is gradually increasing, and especially under the global outbreak of the new crown epidemic in 2020, more users choose to shop online. Under the current global macro environment, global CBE shows the following trends.

More Consumers Choose Online Global Shopping and the Market Size of the Global CBE Industry Continues to
Increase.
e transaction scale of the global CBE industry continued to grow. In a report released in January 2021, it was pointed out that despite the impact of the epidemic in 2020, the scale of global CBE B2C transactions could reach US$3.4 trillion. e global B2C cross-border transaction scale and transaction scale forecast are shown in Figure 8.
As shown in Figure 8, the number of CBE participants increased from 309 million in 2014 to 900 million in 2020. By 2020, the global epidemic reduced CBE, but the global CBE scale will exceed USD 1 trillion in 2020, with an average annual growth rate of up to 30%, and achieve high growth. In 2019, with the development of 5G, the Internet infrastructure will become more and more perfect, global logistics network construction will gradually mature, and CBE will show a high growth trend. Based on the current growth, the survey results predict that the global CBE B2C cross-border transaction scale will maintain a growth of 10% to 20% in the next few years, affected by the increasing number of new crown epidemics translated with http://www.DeepL.com/ Translator (free version).

CBE Platform, Amazon, Is Still in the Leading Position.
According to the data of the Qianzhan Industry Research Institute, the market share of CBE platforms and the categories of platforms used for online shopping are shown in Figure 9.
As shown in Figure 9, when choosing CBE transactions, 24% of cross-border consumers use the Amazon platform and 16% use AliExpress (Alibaba's CBE platform). 14% of users choose eBay, which is positioned as a CBE platform.

Affected by Global Logistics Conditions and Technologies, the Development of Global CBE Varies Greatly.
According to data, consumers in the Middle East who use CBE for overseas shopping account for 70% of online shopping compared to other regions. Less than 50% of CBE consumers in Asia Pacific and North America are the  Mobile Information Systems proportion of e-commerce usage preferences in various regions drawn according to the data. Taking the EU economy as an example, the growth of CBE is also uneven, with Ireland at the bottom with 85%, accounting for only about 2%. In addition, due to cultural influences, Australian cross-border shoppers are more likely to purchase products primarily from the UK and the USA, and over 63% of Canadian users use CBE, with the majority of purchases coming from China and the USA. CBE growth in South America, Brazil, and Argentina has matured since 2018. e total retail sales of CBE account for about 3% of e-commerce.

Development and Trend of CBE.
From the overall point of view of the above national policies, the state is also regulating supervision and protecting intellectual property rights while supporting the development of CBE. It has promoted the standardized development of CBE development through national-level policies. After years of development, the CBE industry generally presents the following trends.

China's CBE Has Entered a Period of Steady Growth and Its
Scale Is on the Rise. CBE in China has grown rapidly in the past few years. Figure 10 shows the scale of China's CBE transactions, the number, and growth rate of imported CBE users.
As shown in Figure 10, 2020 is affected by the new crown pneumonia epidemic. According to statistics, China's CBE exports were 7.29 trillion yuan, an increase of 40.1%, and imports were 3.76 trillion yuan, an increase of 16.5%.

Cross-Border Exports Occupy the Dominant Position of China's CBE.
is paper analyzes the data of China's CBE import and export from 2014 to 2019. e scale and growth rate of China's CBE exports and China's CBE imports are shown in Figure 11.

Conclusion
With the maturity of BT and the in-depth research on the combination of CBE, it will definitely promote the development of the CBE industry and realize the unification of CBE logistics, information flow, and capital flow. is has prompted a change in corporate behavior and finally realized the transformation of the CBE industry driven by BT. CBE is a new form of cross-border trade in the Internet era. With the emergence of new business models such as overseas shopping and live streaming, its business environment has become more complex. Its scope is also wider, and the problems it faces will become more and more complex. Only solving the problems of trust, logistics, payment, goods quality, and supervision of CBE cannot fully meet the needs of CBE development. Especially after the epidemic, the CBE model will also expose more and more problems and risks.
In addition, although blockchain technology can solve the problems encountered in CBE to a certain extent, the development of the technology is still immature, such as the high latency of its consensus algorithm, computational costs, encryption technology, cross-chain communication technology, and taking up a lot of storage space to store the same data which have not been effectively solved. erefore, in the combination of research and CBE, the application of BT is still limited. Based on the existing CBE model, future research can combine BT with increasingly mature and perfect 5G technology. is makes CBE as convenient as e-commerce. In addition, we should also pay attention to the new trends in the development of BT and the relevant policy trends of blockchain token transactions in countries around the world. is is in order to introduce more convenient and low-cost tokens into CBE transactions faster and realize the ability of blockchain value flow transmission.

Data Availability
No data were used to support this study.

Conflicts of Interest
ere are no potential conflicts of interest in this study.