Wang Piaoran¹*, Wang Feifan²

¹Farabi International Business School, Al-Farabi Kazakh National University, Almaty,

Kazakhstan

* Corresponding author: wangpiaoran7@gmail.com

ORCID: https://orcid.org/0009-0009-9412-5720

²Farabi International Business School, Al-Farabi Kazakh National University, Almaty,

Kazakhstan

Email: wangfeifan969@gmail.com

ORCID: https://orcid.org/0009-0003-4197-0492

Abstract

Closed-loop supply chain (CLSC) is an important paradigm for sustainable supply chain management. This paper systematically reviews domestic and international literature to summarize the evolution of this field from linear supply chains to the circular economy transition. The study identifies three major trends in CLSC research: a shift from single-link optimization to whole-chain collaborative governance; an evolution from cost-orientation to value co-creation; and a move from deterministic modeling to robust optimization and intelligent decision-making. This paper further analyzes typical cases including new energy vehicle power battery recycling, electronic product remanufacturing, and apparel reverse logistics to reveal the application mechanisms and practical values of CLSC in different industrial contexts. The results show that the effective operation of CLSC requires systematic governance supported by government policies, enterprise strategic coordination, technological innovation, and consumer participation. Future research should focus on cutting-edge topics such as artificial intelligence-enabled intelligent decision-making and supply chain resilience mechanisms.

Keywords: Closed-loop supply chain; Reverse logistics; Power battery recycling; Sustainable development

1. Introduction

Traditional supply chains have long followed the linear model of “extract–make–use–dispose”. While promoting economic development, this model has also led to resource depletion, environmental pollution, and other problems (Guide & Van Wassenhove, 2009). At present, more than 50 million tons of electronic waste are generated globally each year, and large amounts of waste clothing are incinerated or landfilled. Low resource utilization has become a key bottleneck restricting sustainable development.

Against this background, the closed-loop supply chain has emerged. Unlike traditional linear supply chains, CLSC emphasizes the closed-loop flow of materials. After their service life, products are not simply discarded but recycled, remanufactured, redistributed, or safely disposed through reverse logistics networks (Fleischmann et al., 1997). Its core lies in creating “value recovery” opportunities to extend product life cycles through remanufacturing, reuse, and recycling, thereby generating economic benefits while reducing environmental burdens and achieving the unity of commercial and social values.

In recent years, research on CLSC has grown rapidly. Early studies mainly focused on reverse logistics network design and cost optimization, and gradually expanded to multiple directions such as supply chain coordination mechanisms, carbon emission constraint optimization, and intelligent decision support systems (Rodríguez‑Escoto et al., 2024). Notably, the booming new energy vehicle industry has triggered a large-scale wave of decommissioned power batteries, making power battery recycling and echelon utilization a new hotspot in CLSC research. This paper aims to systematically sort out the theoretical evolution of CLSC research, summarize the main research themes and methodological characteristics, and reveal the practical application mechanisms of CLSC through typical case studies. The research provides important references for promoting the theoretical development of CLSC and guiding enterprise practice and decision-making.

2. Literature Review

Research on closed-loop supply chains has evolved from conceptual initiation to systematic improvement. In the early 1990s, scholars began to focus on end-of-life product management and proposed the conceptual framework of “reverse logistics” (Dell, 1998; Rogers & Tibben‑Lembke, 1999). Subsequent studies recognized the need to systematically integrate forward and reverse logistics, giving rise to the concept of closed-loop supply chains. Guide and Van Wassenhove (2009) pointed out that the core of CLSC is “value recovery”, extending product life cycles through remanufacturing, reuse, and recycling.

From the perspective of research evolution, CLSC studies can be roughly divided into three stages. The first stage (1990–2000) focused on basic issues such as reverse logistics network design, recycling channel location, and inventory optimization. The second stage (2000–2015) shifted to supply chain coordination mechanisms, profit-sharing contracts, and incentive mechanism design under information asymmetry. The third stage (2015–present), driven by the sustainable development agenda, has focused on carbon emission constraints, green procurement, and ecological design. Meanwhile, the rapid development of artificial intelligence has brought new research opportunities for CLSC (Sahamie et al., 2013).

Regarding research content, scholars have explored the design of recycling networks including topology, node location, and capacity allocation. Due to widespread demand uncertainty and recycling rate fluctuations, robust optimization has attracted attention for its ability to handle uncertain problems (Elsevier, 2026a). Rodríguez‑Escoto et al. (2024) constructed a multi-objective optimization model considering economic cost, environmental impact, and social benefits. They found that introducing environmental objectives increases operating costs by 15%–20% but significantly reduces carbon emissions. In addition, the impacts of policy tools such as carbon subsidies and tax incentives on remanufacturing decisions have been studied, showing that moderate carbon subsidies can encourage enterprises to carry out remanufacturing (Zhang & Li, 2023).

The connection between CLSC and sustainable development has become increasingly close. A World Economic Forum (2025) report states that CLSC is a key path to industrial circular transformation, and leading enterprises can reduce waste emissions by 30%–50% by building closed-loop networks. The application of artificial intelligence has become a new trend, with machine learning, deep learning, and reinforcement learning applied to demand forecasting, inventory optimization, and reverse logistics routing (IEEE, 2024a). Decision support systems can improve operational efficiency by 20%–30% (Elsevier, 2024a). Risk modeling addresses disruptions, quality fluctuations, market changes, and policy adjustments (IEEE, 2024b).

3. Research Methods

This study adopts a combined paradigm of systematic literature review and case analysis.

For the literature review, major databases including Web of Science, Scopus, Elsevier ScienceDirect, and Google Scholar are used. Search keywords include “closed-loop supply chain”, “reverse logistics”, “remanufacturing”, “battery recycling”, and “reverse supply chain”. The inclusion criteria are peer-reviewed journal or conference papers directly related to CLSC published after 2000. Non-Chinese/English papers, purely methodological studies without empirical applications, and full-text-unavailable documents are excluded. Content analysis is used to code the included literature and extract research questions, theoretical perspectives, methodologies, and core findings.

For case analysis, a multiple-case study method is adopted. Three typical cases are selected: new energy vehicle power battery recycling, electronic product remanufacturing, and apparel reverse logistics. Cases are chosen for representativeness, covering different industries and including both mature applications and emerging practices.

The literature review provides theoretical perspectives and research contexts, while case analysis presents application mechanisms and value creation paths in practice. The two approaches verify and complement each other, supporting a systematic review and in-depth understanding of CLSC research.

4. Research Results

4.1 Distribution of Research Themes

Through literature analysis, CLSC research covers six major thematic areas. These themes are interrelated and progressive, forming a complete knowledge system.

Table 1 Distribution of Research Themes in Closed-Loop Supply Chain Studies

Theme	Proportion	Main Content
Network Design and Optimization	25%	Topology, node location, capacity allocation
Coordination Mechanisms	20%	Contract design, profit distribution, information sharing
Remanufacturing Decisions	20%	Feasibility assessment, process routes, quality control
Recycling and Reverse Logistics	15%	Channel design, routing optimization, pricing strategies
Sustainable Development	12%	Carbon constraints, green procurement, eco-design
Intelligent Decision and Risk	8%	AI applications, blockchain, risk identification

4.2 Typical Cases

4.2.1 Power Battery Recycling

The rapid development of the new energy vehicle industry has led to a large number of decommissioned power batteries, making their treatment increasingly prominent. Power batteries contain scarce metals such as lithium, cobalt, and nickel, so recycling has important economic and environmental value.

Representative enterprises such as CATL and BYD have established full-life-cycle power battery management systems. Brunp Recycling under CATD has built a closed-loop system: “battery production–use–echelon utilization–recycling”, achieving a recovery rate of over 99% for nickel, cobalt, and manganese. This model reduces raw material costs and environmental pollution, verifying the practical value of CLSC in the power battery field.

4.2.2 Electronic Product Remanufacturing

Electronic product remanufacturing is one of the most commercialized CLSC fields. Enterprises such as IBM and Dell have remanufacturing programs that refurbish retired enterprise servers and sell them at a discount to small and medium-sized enterprises. Compared with new manufacturing, remanufactured servers reduce energy consumption and carbon emissions by about 50%. A core challenge is product quality uncertainty: remaining life and condition vary widely, requiring strict quality assessment and pricing.

4.2.3 Apparel Reverse Logistics

The apparel industry is a typical linear economy sector and an important testing ground for CLSC innovation. Fast fashion brands such as H&M, Zara, and Uniqlo have launched clothing recycling programs where consumers can exchange old clothes for discount coupons. However, actual closed-loop effects are limited: most recycled clothes are exported to secondhand markets or used as industrial rags, with less than 1% recycled into new fibers. This shows that building recycling channels does not equal real closed-loop realization.

High-end outdoor brands such as Patagonia have explored high-value closed-loop models. Its “Worn Wear” program recycles, professionally refurbishes, and offers trade-ins. Refurbished products are sold at 70%–80% of the original price, effectively extending product life cycles. This case indicates that successful CLSC requires not only recycling networks but also deep value connections with consumers to achieve both commercial and environmental benefits through product servitization.

4.3 Summary

Based on literature and case analysis, three core findings are obtained. First, CLSC research has formed a relatively complete theoretical system, shifting from single-link optimization to whole-chain collaborative governance, reflecting deeper systematic understanding. Second, CLSC shows differentiated characteristics and diverse values across industries, requiring industry-specific design. Third, effective CLSC operation demands multi-stakeholder coordination: government policy support, enterprise strategic coordination, technological innovation, and consumer participation are all indispensable. Systematic thinking is key to understanding and advancing CLSC.

5. Discussion

The literature review reveals three theoretical contributions of CLSC research: constructing a CLSC analytical framework that integrates forward and reverse supply chains from a systems perspective; developing supply chain coordination theory with rich contexts of multiple uncertainties; and expanding sustainable supply chain management theory by incorporating environmental externalities into decision-making, leading to carbon-constrained supply chain optimization and green supply chain performance evaluation.

The findings have important practical implications. For enterprises, CLSC has become a strategic tool for competitive advantage. They should actively apply AI, IoT, and blockchain to improve CLSC intelligence. For supply chain governance, reasonable profit-sharing mechanisms and long-term stable reverse logistics networks are needed. Government support is critical: carbon subsidies, tax incentives, and extended producer responsibility can effectively promote CLSC practices, but balance between environmental goals and economic efficiency is required.

This study has limitations: qualitative literature evaluation involves subjectivity; it focuses on academic literature and does not fully include industry reports and enterprise practices. Future CLSC research can focus on: AI-enabled intelligent decision-making and deep reinforcement learning for dynamic optimization; supply chain resilience and risk management under emergencies; digital CLSC with digital twin and industrial internet for full-process visualization and intelligent scheduling.

6. Conclusion

Through systematic literature review and case analysis, this paper sorts out the theoretical evolution, research themes, and methodological characteristics of CLSC research. It covers network design, coordination mechanisms, remanufacturing decisions, recycling optimization, green transformation, and intelligent decision-making, forming a complete theoretical system. Three major trends in CLSC research reflect the deepening understanding of its complexity. Cases such as power battery recycling, electronic product remanufacturing, and apparel reverse logistics show that CLSC presents differentiated features and diverse values in different industrial scenarios. Enterprises should select suitable CLSC business models and operational strategies according to their industry characteristics and resource endowments.

With the promotion of circular economy and sustainable development goals, CLSC will play an increasingly important role in corporate strategy and industrial policy. Especially under the rapid development of artificial intelligence, the effective integration of intelligent technology and CLSC operations will be an important direction for theoretical research and practical exploration.

References

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Fleischmann, M., Bloemhof‑Ruwaard, J. M., Dekker, R., van der Laan, E., van Nunen, J. A., & Van Wassenhove, L. N. (1997). Quantitative models for reverse logistics: A review. European Journal of Operational Research, 103(1), 1–17. https://doi.org/10.1016/S0377‑2217(97)00230‑0

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The European crypto industry is entering a new regulatory era as the Markets in Crypto-Assets (MiCA) framework moves closer to full implementation. For many digital asset companies, the challenge is no longer whether regulation is coming, but how quickly they can adapt their businesses to meet the new requirements.

Against this backdrop, LegalBison has introduced a new research series aimed at helping crypto operators better understand the realities of MiCA compliance and licensing across the European Union.

According to Reuters, LegalBison partnered with Bitcoin.com News to launch “MiCA Decoded,” a 12-part editorial series focused on the operational and legal aspects of the EU’s crypto regulations.

The initiative combines data from public CASP registers, information published by the European Securities and Markets Authority (ESMA), and LegalBison’s own experience working with crypto licensing applications in multiple jurisdictions. Rather than offering general commentary on regulation, the series focuses on practical details that companies often misunderstand during the licensing process.

One of the key topics covered is the structure of the Crypto-Asset Service Provider (CASP) authorization system. The research points out that although more than 170 entities appear in the register, only a limited number currently have authorization to operate centralized cryptocurrency exchanges. This highlights the level of scrutiny regulators are applying to applications and the growing importance of compliance preparation.

The series also examines how MiCA timelines work in practice. While many companies rely on simplified estimates for approval periods, the actual operational process can take significantly longer depending on the jurisdiction, internal documentation, and communication with regulators. LegalBison argues that misunderstanding these timelines is one of the most common reasons crypto businesses experience delays or unsuccessful applications.

Another important issue discussed in the research is the preparation of crypto asset white papers. Under MiCA, projects must provide detailed documentation explaining the structure, purpose, and risks associated with their digital assets. The series notes that many founders still rely on informal or incomplete formats that may not satisfy regulatory expectations. As compliance standards become stricter, documentation quality is becoming a critical factor in the authorization process.

Jurisdictional strategy is another major focus. Although MiCA creates a unified framework across the EU, implementation can still vary between member states. Different countries may offer varying processing speeds, regulatory approaches, and operational advantages for crypto businesses. The research explores how companies evaluate these factors when deciding where to establish their licensing operations.

The growing attention around MiCA reflects a broader shift in the digital asset industry. Regulators are increasingly treating crypto businesses similarly to traditional financial institutions, especially in areas such as anti-money laundering controls, customer verification, operational transparency, and consumer protection. As a result, compliance is becoming part of long-term business strategy rather than a temporary legal obligation.

Industry analysts believe that companies capable of adapting early may gain a competitive advantage as the market matures. Firms with approved licenses are likely to benefit from stronger banking relationships, improved credibility with institutional partners, and broader access to European customers. At the same time, businesses that fail to meet the requirements could face operational restrictions or lose access to key markets.

LegalBison specializes in legal and regulatory services for fintech and digital asset companies. The firm supports projects with licensing strategy, regulatory architecture, AML and KYC compliance programs, and communication with authorities in multiple jurisdictions. Its operational network spans more than 50 countries, with offices in locations including Warsaw, Tallinn, Panama City, Manama, and Kuala Lumpur.

As the implementation deadlines approach, demand for regulatory guidance across the crypto sector is expected to continue growing. Educational initiatives such as “MiCA Decoded” reflect the industry’s increasing need for practical information based on real licensing experience rather than theoretical interpretation alone.

As online trading continues to expand in Nigeria, more users are evaluating international platforms that promise access to global markets. Among them, IQ Option remains one of the most discussed names, raising questions about both legitimacy and security.

As covered by Tribune Online, the platform has been operating for over a decade and serves millions of users across different regions. While longevity can indicate stability, traders still need to assess how the platform functions and what safeguards are actually in place.

From a security perspective, IQ Option follows standard industry protocols. It operates under SKY LADDER LLC, registered in Antigua and Barbuda, and implements SSL encryption to protect data transmission. Account-level protection includes two-factor authentication, which adds an extra verification step during login. Another structural element is the separation of client funds from company funds—this is intended to prevent misuse and ensure that user balances are not tied to operational expenses.

Functionality plays a major role in evaluating platform safety. IQ Option offers a multi-asset environment where users can trade forex pairs, cryptocurrencies, stocks via CFDs, commodities, indices, and options. Having all instruments accessible within one interface simplifies the trading process, especially for users who want to diversify without switching platforms. The system also includes analytical tools such as RSI, MACD, and Bollinger Bands, which help traders interpret price movements and make more informed decisions.

One of the more notable features is how the platform structures risk. Unlike margin-based systems where losses can exceed deposits, IQ Option limits the maximum loss to the amount placed on a trade. This means traders cannot accumulate debt through trading activity. Additional tools enhance this control:

• Stop-loss orders automatically close positions to limit downside risk
• Take-profit settings secure gains once a target level is reached
• Early closure allows traders to exit positions before expiration
• Price alerts notify users when specific levels are reached

These mechanisms are built into the platform rather than offered as optional add-ons, which contributes to a more controlled trading environment.

Despite these safeguards, user feedback reveals some recurring concerns. Most complaints are related to withdrawal timing, particularly when accounts are undergoing verification. This process—commonly known as KYC (Know Your Customer)—requires identity and address confirmation before funds can be released. While standard across financial platforms, it can create delays if users are unprepared. Another common issue involves bonus terms, where traders activate promotions without fully understanding the conditions attached.

The onboarding process itself is relatively straightforward. New users can begin with a demo account that includes virtual funds, allowing them to explore the interface risk-free. Transitioning to a live account requires a minimum deposit, and Nigerian users can fund accounts through local payment systems. Withdrawals are processed back to local bank accounts, typically within several working days depending on verification status.

It is also important to consider regulatory context. IQ Option does not hold a Nigerian SEC license, which means it operates without local regulatory oversight. For some traders, this may be a significant factor when evaluating trust and accountability. Others may prioritize functionality, accessibility, and global presence instead.

In practical terms, the platform’s safety depends not only on its technical infrastructure but also on how it is used. Trading inherently involves financial risk, and no system can eliminate the possibility of loss. Tools and protections can reduce exposure, but they cannot replace strategy, discipline, or market understanding.

Overall, IQ Option presents itself as a legitimate trading platform with established security measures and operational history. For Nigerian traders, the key is to approach it with realistic expectations: use the demo environment first, understand all terms—especially bonuses—and ensure full account verification before initiating withdrawals.

The cryptocurrency sector is continuing to evolve from a niche financial market into a broader institutional ecosystem, and with that growth comes increasing attention to infrastructure security. As more enterprises and financial organizations integrate digital assets into their operations, independently verified cybersecurity standards are becoming a critical factor when selecting crypto payment and custody providers.

As noted by CoinMarketCap Community, CryptoProcessing by Coinspaid has achieved CCSS Level 3 certification for its Institutional-Grade Key Management and Wallet Infrastructure. The certification is the highest level available under the Cryptocurrency Security Standard framework developed by the CryptoCurrency Certification Consortium (C4).

The independent audit was conducted by Hacken, a cybersecurity and blockchain infrastructure auditor approved by C4. The assessment started in the fourth quarter of 2025 and reviewed the company’s Full System operational environment.

CCSS, short for Cryptocurrency Security Standard, is a framework created specifically for digital asset infrastructure. Unlike traditional cybersecurity certifications that focus mainly on general IT systems, CCSS evaluates the operational and technical processes directly involved in cryptocurrency management. This includes how companies generate, store, back up, and protect cryptographic keys, as well as how transactions are authorized and monitored.

The framework is widely recognized within the crypto industry because it addresses the unique risks associated with blockchain-based financial systems. Cryptocurrency infrastructure depends heavily on secure key management since private keys control access to digital assets. If these keys are compromised, funds can potentially be lost permanently. As a result, CCSS places significant emphasis on operational discipline, governance procedures, and layered security controls.

Level 3 is considered the most demanding tier within the CCSS framework. To achieve it, organizations must demonstrate mature infrastructure management, formalized operational policies, and advanced protection mechanisms across the entire system environment. Certification at this level indicates that security practices are integrated into everyday operations rather than implemented only as isolated safeguards.

During the audit, Hacken reviewed multiple areas of CryptoProcessing’s infrastructure. The assessment covered key generation processes, wallet creation procedures, secure key storage systems, backup protocols, access management controls, transaction authorization workflows, logging and monitoring mechanisms, and incident response strategies related to key compromise scenarios.

According to the findings, CryptoProcessing applies governance standards and operational procedures aligned with recognized crypto-native security practices. The review also confirmed that the company maintains structured risk management policies across its infrastructure environment.

The growing importance of certifications like CCSS reflects broader changes taking place across the digital asset industry. Enterprise clients and institutional investors are no longer evaluating providers only on transaction speed or payment functionality. Security transparency and independently validated infrastructure have become equally important, particularly for businesses managing large transaction volumes or operating under strict compliance requirements.

Independent audits can also simplify due diligence processes for financial institutions, banks, and corporate partners considering cryptocurrency integrations. In many cases, organizations entering the crypto sector must demonstrate that their partners follow recognized operational and cybersecurity standards before cooperation can proceed.

Another important factor is regulation. Governments and financial authorities around the world are introducing more detailed frameworks for digital asset oversight. In Europe, regulations such as MiCA and DORA are increasing expectations related to operational resilience, cybersecurity governance, and infrastructure reliability. Companies with independently verified security frameworks may find it easier to align with these regulatory standards.

Max Krupyshev, Executive Leader at CryptoProcessing, described the certification as a meaningful milestone for the company. According to him, CCSS Level 3 requires disciplined operations, resilient security controls, and formalized governance structures across the entire infrastructure environment. He noted that the certification validates the company’s operational maturity and reinforces trust for businesses relying on secure digital asset operations at scale.

CryptoProcessing by Coinspaid stated that it plans to continue investing in technology and security improvements to support businesses adopting cryptocurrency payments globally. The company sees the certification as another step toward delivering dependable and future-ready digital payment infrastructure for enterprise and institutional clients.

Hacken, the auditing company behind the assessment, is recognized within the blockchain cybersecurity sector and employs multiple specialists holding active CCSS Auditor certifications. Industry experts note that the increasing adoption of infrastructure audits and security certifications demonstrates how the crypto sector is gradually moving toward operational standards similar to those expected in traditional financial services.

As institutional adoption of digital assets continues expanding worldwide, independently verified security frameworks are likely to become even more influential in shaping the future of crypto payment infrastructure.