Introduction

Recently, the market has been abuzz with attention on the transfer of control of the WBTC project. The announcement by Sun Yuchen (founder of Tron) of his involvement in the WBTC project quickly sparked widespread controversy within the crypto community. The main focus of the discussion revolves around the security of WBTC, its degree of decentralization, and the potential impact of Sun Yuchen's personal influence on the project.

Since its launch in 2019, WBTC has become an important bridge for Bitcoin's cross-chain applications. By pegging Bitcoin as an ERC-20 token, WBTC has brought broader DeFi applications to Bitcoin. However, WBTC's centralized custodial model has long been a subject of controversy. Sun Yuchen's involvement has reignited discussions on this issue, particularly regarding the importance of cross-chain asset security and decentralized governance.

This article will explore the origins of the controversy surrounding Sun Yuchen's involvement in WBTC by providing an overview of BTC-pegged coins, their mechanisms, and an in-depth analysis of representative projects. It will also discuss the future development direction of BTC-pegged coins.

I. Overview of BTC-Pegged Coins

1.1 Definition and Basic Principles

A BTC-pegged coin is a digital asset mapped to other blockchain networks through specific technical means. These tokens are typically pegged to Bitcoin at a 1:1 ratio, meaning that for every BTC-pegged coin issued, an equivalent amount of Bitcoin is collateralized. This mechanism allows BTC-pegged coins to retain the value properties of Bitcoin on other blockchains (such as Ethereum) while participating in decentralized applications (DApps) on these blockchains.

The creation of BTC-pegged coins primarily aims to compensate for the lack of smart contract functionality on the Bitcoin network, enabling Bitcoin to play a role in more complex financial ecosystems. Although Bitcoin was the first and most widely recognized cryptocurrency, its network lacks Turing completeness and cannot directly support smart contracts and other complex decentralized financial operations. For example, ERC-20 standard tokens on Ethereum can easily integrate into DeFi protocols, and by mapping Bitcoin as an ERC-20 or other standard token, it can be used on smart contract platforms like Ethereum, participating in various DeFi scenarios such as lending, liquidity mining, and derivatives trading, thereby greatly expanding Bitcoin's application scope.

1.2 Demand and Significance of BTC-Pegged Coins

(1) Demand for Cross-Chain Liquidity:
As the highest market cap and most liquid cryptocurrency globally, Bitcoin's user base and holdings far surpass other crypto assets. Seamlessly flowing Bitcoin onto other blockchains, especially those with smart contract functionality, would greatly enhance its use cases and value creation potential. BTC-pegged coins meet this demand for cross-chain liquidity. Through BTC-pegged coins, Bitcoin can exert its asset advantage on other blockchains and participate in more diverse decentralized applications, such as lending, liquidity mining, and derivatives trading.

(2) Driving Force for Decentralized Finance (DeFi) Development:
Bitcoin, as "digital gold," holds immense potential within DeFi. However, due to the technical limitations of the Bitcoin network (such as the lack of smart contract functionality), developing DeFi applications directly on the Bitcoin network presents significant challenges. Therefore, "relocating" Bitcoin onto blockchains with smart contract functionality (like Ethereum) becomes a key path to realizing this goal. BTC-pegged coins enable Bitcoin to participate in the DeFi ecosystem by mapping it onto blockchains like Ethereum. This not only increases Bitcoin's utility but also injects more liquidity and stability into DeFi applications.

(3) Tools for Asset Appreciation and Risk Management:
BTC-pegged coins allow holders to earn additional returns by participating in the DeFi ecosystem without giving up long-term Bitcoin holdings. For example, users holding WBTC can collateralize it on DeFi platforms, borrow stablecoins for other investments, or participate in liquidity mining to earn rewards. Additionally, some decentralized exchanges offer trading pairs between BTC-pegged coins and other assets, providing more arbitrage opportunities for investors. Furthermore, BTC-pegged coins can also serve as a risk management tool, as using them as collateral can effectively reduce the risk of an investment portfolio, acting as a stabilizer.

(4) Enhancing the Practical Utility of the Bitcoin Network:
The Bitcoin network, as the first blockchain, boasts high security and consensus strength. However, its technical limitations mean that Bitcoin's application scenarios are relatively limited, mainly focusing on value storage and simple payment transfers. Over time, market demand for Bitcoin has extended beyond these basic functions, with hopes of using Bitcoin in more extensive financial services. The emergence of BTC-pegged coins provides a broader stage for Bitcoin applications. By issuing pegged coins on other blockchains, Bitcoin can participate in more complex financial operations on these chains, not only enhancing Bitcoin's practical utility but also reinforcing its status as the world's preferred digital asset.

II. Mechanisms of BTC-Pegged Coins

2.1 Centralized Pegging vs. Decentralized Pegging

The core of BTC-pegged coins lies in how Bitcoin is locked on its native chain and cross-chain technology is used to generate tokens equivalent to it. Depending on this core mechanism, the working mechanisms of BTC-pegged coins can be divided into two categories: centralized and decentralized.

• Centralized Pegging Mechanism:
  This relies on trusted third-party custodians who are responsible for managing users' locked Bitcoin and minting the corresponding pegged tokens based on the amount of locked Bitcoin. For example, WBTC is a typical centralized pegged coin. Users send Bitcoin to a custodian (like BitGo), which manages these Bitcoins and mints an equivalent amount of WBTC tokens on the Ethereum network. When users want to redeem Bitcoin, the custodian burns the corresponding amount of WBTC and returns the Bitcoin to the users. The advantage of this model is its simplicity and fast transaction speed, but it carries trust risks and potential security hazards due to centralized management.

• Decentralized Pegging Mechanism:
  This is achieved through a distributed network and cryptographic technology to enable cross-chain transfer and tokenization of Bitcoin. An example is renBTC, which operates without relying on a single institution but through a distributed node network of the Ren Protocol to manage and verify the locking and minting of Bitcoin. The Ren Protocol uses secure multi-party computation (MPC) technology, distributing the custody process of Bitcoin across multiple independent nodes, ensuring no single node can control the Bitcoin's private key. This mechanism significantly reduces centralization risk, enhancing the system's security and transparency. However, due to the high technical complexity, the minting and redemption process of decentralized pegged coins is usually more complicated and time-consuming.

2.2 Minting and Burning Process

The minting and burning processes of BTC-pegged coins are core elements of their working mechanisms, representing the conversion between Bitcoin and pegged coins.

• Minting Process:
  The process of minting BTC-pegged coins typically involves locking the native Bitcoin in a multi-signature address or smart contract and generating an equivalent amount of pegged tokens on the target blockchain (like Ethereum). For example, with WBTC, when users want to obtain WBTC, they need to send an equivalent amount of Bitcoin to a custodian address managed by BitGo. Once the Bitcoin transaction is confirmed by the network, BitGo mints the equivalent amount of WBTC on Ethereum via a smart contract and sends it to the user's Ethereum address. Users can verify every step through a block explorer.

• Burning Process:
  When users want to convert BTC-pegged coins back to Bitcoin, they trigger the burning process. Users first send the pegged coins (like WBTC) to the corresponding smart contract for burning, while simultaneously requesting the custodian to redeem Bitcoin. Once the burn transaction is confirmed, the custodian releases the originally locked Bitcoin and sends it to the user's specified Bitcoin address.

In a decentralized model, such as renBTC, the minting and burning process is more complex, involving the consensus and collaboration of distributed network nodes. After users send Bitcoin to Ren Protocol's custody address, multiple independent nodes verify the transaction and collaboratively generate renBTC using secure multi-party computation technology. The burning process involves reverse operations, where renBTC is burned, and multiple nodes jointly decide to release the corresponding Bitcoin.

2.3 Decentralized Custody and Trust Model

Unlike centralized custody, decentralized custody ensures the secure management of Bitcoin through a distributed network and cryptographic technology, avoiding over-reliance on a single institution.

• Multi-Signature Mechanism:
  For example, tBTC uses a multi-signature (threshold signature) mechanism, randomly selecting multiple signers to jointly manage Bitcoin's private key. These signers provide collateral (like ETH) to ensure the legitimacy of their actions, facing economic losses if they attempt malicious operations. In theory, this mechanism can achieve higher security and decentralization.

• Secure Multi-Party Computation (MPC):
  Ren Protocol adopts MPC technology, allowing multiple nodes to jointly manage Bitcoin without revealing the private key. This technology ensures that even if individual nodes are attacked, the network's overall security remains unaffected. Through this method, Ren Protocol achieves decentralized management of BTC-pegged coins.

2.4 Cross-Chain Communication and Smart Contract Execution

Cross-chain operations of BTC-pegged coins rely on cross-chain communication protocols and smart contract execution. Cross-chain communication protocols transmit information between the Bitcoin network and the target blockchain (like Ethereum), while smart contracts automate the management of minting, burning, and other operations.

• Cross-Chain Communication:
  Cross-chain communication typically relies on relayers or observers, components that monitor transactions on the Bitcoin network and transmit relevant information to the target blockchain. For example, Ren's Darknodes monitor Bitcoin network transactions and broadcast the information to the Ethereum network, triggering corresponding smart contract operations.

• Smart Contract Execution:
  Smart contracts are the automation core of BTC-pegged coins' operations. Whether it's the centralized minting process of WBTC or the decentralized minting process of renBTC, neither can function without smart contract execution. These contracts ensure that each minting and burning operation is transparent and tamper-proof, automatically handling user requests, verifying transactions, and updating on-chain data.

III. Representative BTC-Pegged Projects and Current Analysis

Early BTC-pegged attempts focused primarily on exploring cross-chain technology. Early attempts include the concept of Bitcoin sidechains, like Rootstock (RSK), which aimed to achieve interoperability between Bitcoin and other blockchains via sidechains. However, these early projects did not gain widespread market adoption due to technical complexity and implementation challenges.

3.1 The Birth of WBTC and Market Adoption

In 2018, the WBTC (Wrapped Bitcoin) project was officially launched, marking an important milestone in the development of BTC-pegged coins. WBTC was initiated jointly by BitGo, Kyber Network, and Ren Protocol, becoming the first ERC-20 token to achieve 1:1 Bitcoin pegging on Ethereum. Through centralized custody, WBTC locks Bitcoin in BitGo's custody account and mints an equivalent amount of WBTC tokens on Ethereum. WBTC's emergence opened the door for Bitcoin applications in the Ethereum ecosystem, enabling Bitcoin to participate in DeFi applications. Due to its transparency and high market acceptance, WBTC quickly became the most popular BTC-pegged coin in the market.

According to WBTC's official website, WBTC's current issuance volume reaches 150,000 tokens, valued at approximately $9 billion. Among these, 40.6% is used for lending, 32.6% for buying and holding, and 11.3% for cross-chain interoperability.

3.2 The Rise of Decentralized Pegged Coins

With the rapid development of the DeFi market, users' demand for decentralization and security is increasing. Some decentralized BTC-pegged coin projects have emerged to avoid the trust risks associated with centralized custody.

• renBTC:
  renBTC, launched by Ren Protocol, is a decentralized BTC-pegged coin. Ren Protocol achieves cross-chain transfer and custody of Bitcoin through secure multi-party computation (MPC) technology. The Ren network consists of a series of decentralized nodes (called Darknodes) collectively responsible for Bitcoin custody and renBTC minting. The main advantage of renBTC lies in its high degree of decentralization, reducing reliance on a single institution, though its technical complexity is relatively high.

• tBTC:
  tBTC, launched by Keep Network, is another decentralized BTC-pegged coin. tBTC uses a unique threshold signature scheme, randomly selecting multiple signers to jointly manage Bitcoin's cross-chain transfer. The design goal of tBTC is to minimize reliance on centralized institutions, ensuring users have complete control over their Bitcoin. However, tBTC faces certain challenges in promotion due to its complex mechanism and high technical threshold.

3.3 Diversification and Ecosystem Expansion of BTC-Pegged Coins

With the emergence of more blockchain platforms and the diversification of market demand, BTC-pegged coins are beginning to diversify and extend to multiple chains. Not only on Ethereum but also other blockchain platforms such as Binance Smart Chain, Tron, and Polygon have begun to support the issuance and application of BTC-pegged coins.

• sBTC (Synthetix BTC):
  Issued by the Synthetix platform, this synthetic asset simulates Bitcoin's price changes through over-collateralization. sBTC provides users with greater flexibility, especially in synthetic asset trading and DeFi applications.

• BBTC (Binance Wrapped BTC):
  Launched by Binance, it strictly adheres to a 1:1 asset backing principle, enabling seamless flow of BTC between Ethereum and Binance Smart Chain.

3.4 Current Analysis of BTC-Pegged Coins

• WBTC's Dominance:
  As of August 2024, WBTC remains the dominant BTC-pegged coin in the market, with a market share of 94.7%. This data indicates that despite the existence of various BTC-pegged coins, WBTC, with its early market entry, extensive DeFi support, and high trust level, remains the preferred choice for users.

• Performance of Other BTC-Pegged Coins:
  tBTC, BBTC, and HBTC also hold a certain market share, though their total volume is relatively small. Among them, tBTC holds a 1.9% share, and BBTC 1.8%. These BTC-pegged coins are primarily used in specific application scenarios or supported by specific communities.

IV. The Rise of BTC LSD Tokens

The rise of staking and re-staking concepts has brought new development directions to BTC-pegged coins. Babylon launched a non-custodial Bitcoin staking solution, achieving Bitcoin staking through cryptographic means and generating liquid staking tokens. This project opens up a new track for BTC staking by improving the capital efficiency of staked assets.

4.1 stBTC

stBTC is an important representative of BTC LSD tokens, launched by Lorenzo Protocol. The minting process of stBTC involves staking native Bitcoin in Lorenzo Protocol's custody contract and generating corresponding stBTC tokens based on the amount of Bitcoin staked. Users can use stBTC for other financial activities and redeem native Bitcoin by burning stBTC tokens when needed. stBTC not only improves the capital utilization of Bitcoin but also allows holders to flow and appreciate freely in the DeFi ecosystem.

4.2 LBTC

LBTC, launched by Lombard, is a BTC LSD token that aims to provide Bitcoin holders with safer and more transparent staking returns through decentralized staking management. Similar to stBTC, users can participate in the DeFi ecosystem by minting LBTC, utilizing LBTC to earn returns in decentralized exchanges, lending protocols, and yield strategy platforms. Users can also delegate LBTC to Babylon to obtain Proof-of-Stake (PoS) security returns. In addition, Babylon offers additional reward incentives for deposited BTC, including potential returns and other incentives.

4.3 SolvBTC

SolvBTC, launched by Solv, is a BTC LSD token designed to provide an efficient liquid staking solution by integrating staking returns across multiple chains such as Bitcoin and Ethereum. SolvBTC offers users more flexible staking and liquidity management services through an innovative decentralized asset management framework. By integrating multi-chain staking returns, SolvBTC provides users with broader investment and arbitrage opportunities. Users can use SolvBTC in various DeFi protocols, such as decentralized exchanges, lending protocols, and yield farms, and redeem the corresponding assets by burning SolvBTC when needed.

V. Analysis of Risks and Opportunities of BTC-Pegged Coins

As an innovative tool for introducing Bitcoin into other blockchain ecosystems, BTC-pegged coins demonstrate great potential in enhancing Bitcoin's liquidity and expanding its application scope. However, like other financial innovations, BTC-pegged coins face a series of risks and challenges during development.

5.1 Risk Analysis of BTC-Pegged Coins

(1) Centralization Risk:
The security of custodial institutions is crucial. If custodial institutions are hacked or poorly managed, it could lead to the loss or theft of Bitcoin, seriously affecting the value and market confidence of pegged coins. Centralized custody also means that if the custodian institution faces operational problems, such as bankruptcy, regulatory intervention, or other forms of failure, users may be unable to redeem their Bitcoin, facing the risk of capital loss.

(2) Technical Risk:
Decentralized protocols often involve complex technologies such as multi-signature and MPC (secure multi-party computation). Implementing these technologies requires highly accurate code and meticulous management, and any vulnerabilities or design flaws could lead to system crashes or security incidents. Decentralized pegged coins rely on consensus among multiple nodes. If these nodes are attacked, fail, or engage in malicious behavior, it could impact the stability and security of the pegged coins.

(3) Smart Contract Vulnerabilities:
BTC-pegged coins are usually managed by smart contracts that govern the minting and burning process. Once smart contract code is deployed, it is difficult to change, and any undiscovered vulnerabilities could be maliciously exploited, leading to fund losses. There have been several instances in history where large-scale attacks were triggered by smart contract vulnerabilities, and BTC-pegged coin projects are no exception. BTC-pegged coins often interact with other DeFi protocols, and this dependency may introduce additional risks. If the protocols they interact with fail or are attacked, it may affect the normal operation of the pegged coins.

(4) Regulatory Uncertainty:
As the cryptocurrency market develops, regulatory agencies in various countries are increasingly tightening their control over crypto assets. BTC-pegged coins may face compliance pressure, particularly regarding KYC and AML regulations. Strict regulations may limit the liquidity of pegged coins or increase operational costs.

5.2 Opportunity Analysis of BTC-Pegged Coins

(1) Expansion of Cross-Chain Liquidity and DeFi Applications:
The biggest opportunity for BTC-pegged coins lies in their ability to bring cross-chain liquidity to Bitcoin, enabling it to participate in the DeFi ecosystem of smart contract platforms like Ethereum. This capability transforms Bitcoin from merely a store of value and simple payment into a dynamic asset that can participate in complex financial activities such as lending, liquidity provision, and derivatives trading.

(2) The Rise of Multi-Chain Ecosystems:
With the development of cross-chain technology, the application of BTC-pegged coins is no longer limited to Ethereum but is gradually expanding to multiple blockchain platforms such as BSC, Solana, and others. The rise of this multi-chain ecosystem opens up new application scenarios and market spaces for BTC-pegged coins. From DeFi to NFT markets and decentralized governance, the potential application range of BTC-pegged coins is continuously expanding.

(3) Development of BTC LSD:
BTC LSD tokens allow Bitcoin holders to maintain asset liquidity while staking, thereby achieving higher capital efficiency in the DeFi ecosystem. The emergence of LSD tokens makes Bitcoin staking more flexible and efficient, attracting more Bitcoin holders to participate in staking and DeFi activities, further driving the market development of BTC-pegged coins.

(4) Participation of Institutional Investors:
As the cryptocurrency market matures and infrastructure improves, more institutional investors are starting to participate in the BTC-pegged coin market. The entry of institutional investors not only brings a large amount of capital but also enhances market trust and stability. The demand from institutional investors has driven project teams to improve technical security and regulatory compliance, raising the standards and credibility of the entire industry.

Conclusion

Sun Yuchen's involvement in WBTC has sparked controversy mainly because WBTC dominates the BTC-pegged coin market, holding nearly 95% market share and being widely used in the DeFi ecosystem. As a core asset of decentralized finance, the security and transparency of WBTC custody are crucial. Sun Yuchen's participation has raised concerns in the community about increased centralized control and potential conflicts of interest, especially against the backdrop of the transfer of BitGo's custodial rights, increasing doubts about WBTC's management and underlying asset security, with worries that it may affect the stability and trustworthiness of the DeFi market.

However, it is undeniable that BTC-pegged coins have opened up new application scenarios and value spaces for Bitcoin. The key to future development will be how to fully leverage the potential of BTC-pegged coins while ensuring security. The rise of BTC LSD tokens reflects an important trend in Bitcoin's application in the DeFi field: transforming static assets into dynamic assets with liquidity and yield properties. This trend not only improves Bitcoin's capital efficiency but also provides users with more diversified investment opportunities. The success of BTC LSD tokens depends not only on their technical implementation and market application but also on balancing security, decentralization, and user experience. As cross-chain technology, the DeFi ecosystem, and liquid staking derivatives mature further, BTC-pegged coins are expected to play an increasingly important role in the future cryptocurrency market, providing Bitcoin holders with richer and more flexible asset management tools.

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