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e challenges faced by consumers and extensive experience in technological aspects by introducing DID across various technological fields. Furthermore, in pursuit of the B2G (Business-to-global) model, it has tried to enhance trust through improved block verification methods and to facilitate service providers with customized improvements such as allowing fee delegation transactions. Based on these efforts, Metadium aims to expand its ecosystem globally. Our vision is to prioritize privacy and user-centered services in the digital world. Through the Metadium blockchain Identity Layer, users can freely explore the digital world and possess and manage a reliable digital identity. Through this, we will contribute to improving the innovation and security of blockchain technology and participate in the developing the blockchain ecosystem. 4 Identity in Metadium As authentication methods evolve, traditional approaches have relied on Public Key Infrastructure (PKI) to provide public-key encryption for various forms of communication, including email, messaging applications, and websites. However, most implementations depend on centralized third-party certificate authorities (CAs) to issue, revoke, and store key pairs. External attackers can target these certification authorities to compromise encrypted communications or manipulate identities. Instead, publishing keys on the blockchain theoretically eliminates the risk of fake key propagation (tampering) and allows applications to verify the identities of communication counterparts. Therefore, deploying certificates on the blockchain enables the establishment of secure and trustworthy communication without relying on centralized third-party certification authorities. Metadium's self-sovereign identity has been developed to support decentralized digital identity and provide a secure next-generation identity. It gradually developed based on the initial Meta ID and has evolved into the DID method. DID is a new user information management system that aims to return sovereignty over user information to users, moving away from the existing centralized system in which service providers manage control of user information. Users directly own and manage their personal information. The ID system using DID does not transmit personal information during the authentication process for users to use the service but verifies only information about the credentials issued by the issuing agency. The signature of a DID provides a means to cryptographically verify the DID document, proving control over the Private Key corresponding to the Public Key in the DID document. Signing the DID document with the Private Key demonstrates control over the Private Key up to the point of registration of the DID document. However, if the DID document is not signed, proof can be established by sending a request message containing the public key description of the DID document along with a nonce to the appropriate Service endpoint. Metadium DID structure DID is an essential element in managing the digital identity of an individual or organization, and CRUD work is performed based on DID and DID documents. Users or organizations can create DIDs, read the information, and update or delete the information if necessary. These CRUD operations can effectively handle digital identity management. Metadium DID Process Utilizing DID for signing contracts and other records ensures that these transactions are executed and recorded on the blockchain through smart contracts, guaranteeing data integrity and preventing tampering. Moreover, using only simple DID without including personal information ensures privacy protection and anonymity, mitigating the risk of personal data exposure. Users create private keys and public keys using the DID App and create DIDs by sending the public key and signature to the smart contract on the blockchain. After issuing a DID, if you receive proof from the issuer that you are eligible for the user, you will receive a certificate signed with the issuer's private key. When using the service, the user sends the certificate to the Verifier, and the Verifier returns that the certificate has been signed by the Issuer utilizing the user's public key and the Issuer's registered in the blockchain. When requesting deletion, the user sends his/her DID and signature, and the DID smart contract deletes the DID after confirming the user's signature and returns the result. 5 Metropolis As a preparatory step towards Metadium's new vision, several implementations have been carried out in stages, including changing the block generation cycle, renewing the Explorer specialized for the Metadium blockchain layer, and implementing fee delegation and EIP-1559 through the Bokbunja hard fork. Block generation cycle The block creation time is consistent with self-sovereign identity authentication, and to ensure immediateness in DID creation, blocks are created within 100ms when a transaction occurs, and block creation logic at 5-second intervals when no transaction has been maintained. However, contrary to the initial intentions of Metadium, the utilization of DID has resulted in the consumption of significant resources not only for DID-related transactions but also for other transactions. It has led to the accumulation of garbage data on the Metadium blockchain. Therefore, by fixing the block generation cycle of the Metadium blockchain to 2 seconds, we strengthen network security to make it difficult for malicious attackers with more computing power to modify blocks and increase the block generation time to reduce the impact on the network. The load is also regulated. Additionally, adjusting the block creation time makes the network stable and the consensus process reliable. Identity Blockchain Explorer A blockchain explorer is a tool that allows users to navigate and search data on a blockchain network visually. This tool provides users an easy way to explore and understand information on the blockchain, such as transactions, blocks, addresses, and more. The Metadium Explorer provides functionalities to view block information such as block number, time, transaction count, and hash, enabling users to examine the transaction records on the blockchain. Additionally, it allows users to inspect transaction details within a block, including sender, recipient, and amount. It provides features to query transaction history and balances based on specific addresses, facilitating the verification of transaction records and balances associated with particular addresses. To kickstart the Identity Layer, Metadium provides visualizations of the Metadium ID system for easy comprehension and statistics and graphs to facilitate understanding of blockchain activities and transaction flows. Fee delegation The blockchain operates on a structure where fees must be paid to execute transactions. Users need to have a certain amount of Meta to initiate transactions, but there are instances where the platform may want to cover the transaction fees instead of requiring users to pay them. In Metadium, the core supports a structure where service providers can delegate transaction fees on behalf of users, even if users do not directly pay the fees themselves. Structurally, a new type of transaction has been added where, after the user signs, the transaction can be initiated by adding the delegate's signature. In this case, the delegate pays the fees, enabling the user to proceed with the transaction. EIP-1559 EIP-1559 is Ethereum's proposed fee mechanism to address fee volatility and transaction delay issues. It separates the base fee from miner rewards, with the base fee fluctuating based on network traffic. However, the fundamental structure remains the same higher fees result in miners processing transactions more quickly. Metadium has adopted EIP-1559 to alleviate unnecessary transaction delays caused by increasing daily transaction volume. However, Metadium chooses to fix the base fee at 0, thus not burning fees as suggested in EIP-1559. This approach allows for flexibility in adapting to future fluctuations in the blockchain market. 6 Token Economics The initial issuance of 2 billion tokens in the Metadium blockchain has been managed by distinguishing between circulating and non-circulating supplies. The non-circulating supply includes quantities allocated to the Miner, Ecosystem, Maintenance, Company Own, and Company Reserve, while the remaining quantity is considered the circulating supply. There are several changes in the Token Economy of Metadium 2.0. One involves adjustments to the Staking amount for Miners, and the other consists of redirecting the transaction fees previously paid to Miners to the Fee Collector's address. The Fee Collector is a wallet managed by the Metadium Foundation and is used to circulate supply management within the Metadium ecosystem. Explanation for redesigning the Metadium Token Economy Market Changes: The blockchain and cryptocurrency market is undergoing rapid transformation. Unlike in the past, where profit was generated solely from single services on a single platform, the objective now is to provide stable consensus structures and services by connecting another platform to a giant platform. User motivation: In the early stages of the blockchain market, incentives were indiscriminately distributed as part of efforts to secure users rather than to expand the ecosystem concept. However, despite these efforts, user motivation could have been smoother, leading to the evolution of a system where separate assets are designated to maintain the ecosystem, paying ecosystem maintenance costs to users who contribute. Scale and scalability: The Metadium blockchain has seen a rapid increase in transaction volume proportional to the number of users based on various services. Efforts to improve this and maintain network security are ongoing. Change in project goal: While Metadium's Identity Layer has been making efforts to integrate into the market, it now aims to adopt a structure where the Identity Layer between different blockchains can be shared, allowing verification not only in the Metadium blockchain but also in heterogeneous blockchains. Improving usability: To design a system where users can receive rewards for contributing to the Ecosystem, we aim to increase the volume while simultaneously creating an environment where tokens acquired by users can be meaningfully utilized. (a) Governance Staking & Reward The block generation in the Metadium blockchain is implemented through a system where nine Miner nodes record etcd data to seize mining opportunities. Moreover, the prerequisite condition for participating as a Miner was initially a Staking amount of 4,980,000 Meta. However, one must deposit 5,000,000 Meta to participate as a Miner. Rewards for Miners are distributed at specific points in time according to the agreement with the Metadium altar. (b) Transaction Fee Transaction fees are the amounts paid on a blockchain network to process transactions and include them in blocks, serving as essential elements to maintain the security and performance of the blockchain network. In the existing Metadium system, transaction fees have been paid to compensate Miners for their participation and for generating blocks through proper validation. In Metadium 2.0, the reward for Miners is transitioned to drive the ecosystem forward. Transaction fees are converted from the non-circulating supply to the circulating supply, and the wallet where transaction fees are collected is referred to as the Fee Collector. 7 Governance (a) Purpose Metadium receives various proposals to improve the ecosystem in a decentralized way and allows members to directly participate in decision-making. In the existing Metadium Governance contract Based on this, transparent decision-making is made through a voting process, and the following settings may be changed. You can add, delete and replace Authority members of the Metadium network, change the address of the Governance contract, change the Voting Duration value, the maximum and minimum Staking values, the creation time of the generated block, and the reward size and distribution method. In addition to pre-determined system settings, hard fork-related tasks such as protocol changes use off-chain services, and if more than half of the consensus is reached, Metadium protocol changes are carried out. Only users who have staked a certain level of Meta can participate in these tasks. Through a decentralized approach, Metadium ecosystem can be improved by sustaining and expanding functionalities of the Governance contract, which should be provided in line with Metadium feature updates. (b) Update details The following is the update to the governance function in Metadium 2.0. Ⅰ. All authorities have the same voting power regardless of the amount of meta-staking. Ⅱ. Addition of MaxPriorityFeePerGas change function: Voting for change of MaxPriorityFeePerGas is added. When voting passes, MaxPriorityFeePerGas changes, and the default value is 80Gwei. Ⅲ. Addition of Gas Limit & baseFee change function: Voting is added to change the Gas Limit, baseFee change range, and baseFee increase rate. (c) Effect/Meaning By updating and adding features to existing voting functions, the degree of decentralization for voting can be increased, and more participation opportunities and various functions can be provided to network participants. In addition, Metadium plans to update the Governance contract according to future protocol changes and proposals. 8 Roadmap As blockchain technology establishes itself as core infrastructure across various industries, there is growing demand not only for technical implementation but also for services that users can actually experience, along with a stable network environment. Particularly in areas with high-volume traffic such as gaming, content, and data, a technical foundation that simultaneously satisfies the transparency and efficiency of blockchain has become essential. Metadium defines 2026 as 'the year of real-world use case expansion,' focusing on launching blockchain services in which users can directly participate, and strengthening network infrastructure capable of accommodating more projects. Through this, we aim to expand the utility of the Metadium ecosystem and further solidify our competitiveness as a sustainable blockchain platform. Phase 1 — Launch of Game Tournament Platform MetaArena Metadium will launch MetaArena, a blockchain-based game tournament platform. MetaArena enables game developers to host tournaments by integrating an SDK, while users participate using META tokens and receive prizes based on their performance. Prize distribution is processed automatically through smart contracts, and score verification is handled on the server side, making manipulation impossible. By leveraging blockchain technology, MetaArena addresses the issues that have long persisted in conventional game tournaments, including opaque prize management, the possibility of score manipulation, and the high infrastructure costs faced by developers. The entire process, from participation to prize claim, is transparently recorded on-chain. Phase 2 — Network Upgrade (Hardfork + Blob Integration) Metadium plans to carry out a network upgrade to ensure that more projects and ecosystem participants can be onboarded in a stable manner. The core of this upgrade is the integration of Blob, a technology that enables blockchains to handle large-scale data more efficiently. This will provide an environment in which a wider range of projects can build their services on top of Metadium. Applying Blob to the network requires a Hardfork, which involves modifying the core rules of the network and is an essential procedure for the stable operation of new features. Through this upgrade, Metadium will evolve into a more scalable blockchain infrastructure. Metadium will continue to expand its presence in the global market through real-world blockchain services and infrastructure enhancement. Building on verified use cases in user-participatory areas such as gaming and content, we will explore opportunities for collaboration with diverse industries and establish ourselves as a globally competitive platform with a stable and scalable blockchain network. 9 Conclusion Metadium seeks to build an innovative blockchain ecosystem based on distributed identity authentication (DID) technology and trust. Our vision is to create a future where users own and control their own identity information based on self-sovereign identity. Metadium is an EVM blockchain that is expandable and compatible with Ethereum-based blockchains, so we aim to provide an Identity Layer to projects that are very influential in the current market or share a vision with Metadium. This completes the Metadium ecosystem by inflowing and activating transactions generated by various services into Metadium. Metadium leads innovation in the blockchain ecosystem and provides users with both freedom and security. We understand the importance of identity information and seek to pioneer the future of blockchain by enabling user-centric identity management. Metadium blockchain contributes to the blockchain ecosystem through self-sovereign identity and will support blockchain-based services that enhance decentralization and personal data protection to be distributed to more users. We prioritize users' data privacy and safety and aim to lead innovation in the digital world through the identity management solutions provided by Metadium. Previous version: Metadium 2.1 White Paper (2025.02.21)