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We sincerely apologize for the significant confusion and inconvenience caused to our customers due to the erroneous payment incident that occurred on February 6. We deeply acknowledge our grave responsibility for failing to uphold “stability and integrity,” the top priorities of a virtual asset exchange. Following this erroneous payment incident, we have completed all required reports to the relevant authorities and are also cooperating in good faith with the ongoing inspection by the Financial Supervisory Service. 1. We will ensure that human error does not become an incident through systems and processes. To prevent a recurrence, Bithumb has established measures to strengthen our internal control systems and implement innovation-focused recurrence-prevention initiatives. (1) Enhancement of the asset verification system: When executing payments based on events or company policies, we will strengthen verification systems for both customer and company assets. (2) Improvement of the multi-level approval system: For customer asset transfers and reward payments, we will supplement processes that had been partially omitted so that approvals of at least two stages are executed, thereby preventing incidents. (3) Strengthening AI-based abnormal transaction detection and automatic blocking systems: If abnormal transactions or figures are detected, we will operate a 24/7 “safeguard” that enables the system to immediately detect and fundamentally block incidents at the source. (4) External system audit by specialized institutions: Through a global security specialist, we will conduct a comprehensive diagnosis of Bithumb’s entire system and disclose the results transparently. 2. We will take full responsibility to ensure customers do not incur losses. Since our second notice up to the present, no direct losses to customer assets have occurred as a result of the erroneous payment incident. However, we have confirmed cases in which some trades during the incident window were executed on unfavorable terms for customers due to a sharp price drop (panic selling). Bithumb has determined that these trades should also be treated as the company’s responsibility from a customer protection perspective, and we plan to provide additional compensation, including full reimbursement, to the affected customers. As of 2026-02-07 16:00, the estimated customer loss amount is understood to be approximately KRW 1 billion. We plan to compensate all portions that may be added thereafter as well. (1) Special 110% compensation for panic selling: For customers who sold at low prices due to the incident among sell trades during the incident window (2026-02-06 19:30~19:45), we will pay the full amount of the price difference plus an additional 10%. (Automatic payment within one week after data verification) (2) Compensation for all customers who accessed the service during the incident window: We will pay KRW 20,000 within one week to all customers who were accessing Bithumb’s service during the incident window. (3) Zero trading fees for all customers: As a token of appreciation to all customers who trusted us and waited, we will reduce trading fees to 0% for all markets for 7 days. (Separate notice to follow) (4) Establishment of a KRW 100 billion “Customer Protection Fund” on a standing basis: We will operate a dedicated fund, separately deposited, to provide immediate relief for customer assets even in the event of unforeseen incidents. Bithumb will take this incident as a lesson and place “customer trust and peace of mind” as our top priority over outward growth. We once again sincerely apologize. February 7, 2026 Sincerely, Jaewon Lee, CEO, Bithumb Co., Ltd.

Update date: 2026-02-07 04:30 Regarding today’s erroneous payment incident, we have confirmed the facts more clearly and are providing the following additional notice. 1. Cause During the event reward distribution process, an input error in the Bitcoin amount resulted in Bitcoin being mistakenly credited to some customers. The details are as follows. - 2026-02-06 19:00: Event rewards paid to 695 customers - 2026-02-06 19:20: Erroneous reward payment identified - 2026-02-06 19:35: Trading/withdrawal restrictions initiated - 2026-02-06 19:40: Trading/withdrawal restrictions completed 2. Status of recovery of erroneously credited assets Using our internal controls system for detecting abnormal transactions, we restricted trading and withdrawals for the 695 affected customers within 35 minutes of the erroneous credit. More than 99% of the erroneously credited amount has been recovered, and swift action helped minimize potential customer impact. We are also proceeding with prompt recovery measures for the remaining unrecovered assets. - Erroneously credited amount: 620,000 BTC - Recovered: 618,212 BTC (99.7% of the total) - Of the assets (KRW and cryptoassets) equivalent to 1,788 BTC that had already been sold, 93% has also been recovered (We have confirmed that there were no external transfers of the erroneously credited Bitcoin.) The number of coins held in wallets is maintained to be 100% identical to the balance displayed on customers’ screens through strict accounting controls, and we disclose this transparently through quarterly asset audits conducted with an external accounting firm. In this incident, the BTC amount that could not be recovered and was already sold will be fully covered using company-held assets. Bithumb takes this incident seriously and will devote all efforts to preventing a recurrence by redesigning the overall asset payment process and enhancing our internal controls system. We will do our utmost so that users can feel secure and continue to trust Bithumb’s services. We sincerely apologize for the inconvenience caused to our customers due to the confusion that arose during this event distribution process. During today’s event distribution process, an abnormal amount of Bitcoin was credited to some customers. As sales were executed from some accounts that received the Bitcoin, Bitcoin prices temporarily experienced sharp volatility. Bithumb immediately detected abnormal transactions through our internal controls system and promptly restricted trading for the relevant accounts. As a result, the market price returned to normal levels within 5 minutes, and the domino liquidation prevention system operated normally, meaning no cascading liquidations occurred due to the abnormal Bitcoin price. We would like to make it clear that this matter is unrelated to any external hacking or security breach, and that there are no issues whatsoever with system security or the management of customer assets. Customer assets continue to be managed safely as before, and trading as well as deposits and withdrawals are currently operating normally. While we understand that no customer asset losses or damages have occurred as a result of this matter, we will share all follow-up actions transparently and take responsibility through to the end to ensure that not a single customer is harmed. Bithumb pledges to disclose additional facts regarding this matter transparently. Once again, we deeply apologize for causing concern, and we will continue to do our utmost to provide a stable and reliable trading environment.

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Hello. This is Bithumb, your trusted financial partner. Pursuant to Article 10 of the Digital Asset Exchange Alliance (DAXA) “Guidelines on the Sale of Virtual Assets by Virtual Asset Service Providers,” we hereby disclose the virtual asset sale plan as follows. Virtual Asset Sale Plan of Korbit Co., Ltd. ※Notes When a virtual asset service provider sells virtual assets, it discloses the sale plan in advance on the websites of the selling business, the selling exchange, and DAXA, in accordance with Article 10 (Disclosure of Sale Plan) of the DAXA “Guidelines on the Sale of Virtual Assets by Virtual Asset Service Providers.” This sale plan is information provided regarding the sale plan of the relevant virtual asset service provider, and please note that Bithumb is providing this notice in line with its disclosure obligations. If you have any questions regarding the disclosed information, please contact the relevant virtual asset service provider.

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Coinone Hello, this is Coinone. Coinone has supported trading by rigorously screening each virtual asset to help build a sound virtual-asset ecosystem. In accordance with the “Policy on Designation as a Trading Caution Asset and Termination of Trading Support,” we would like to inform you that Stella (ALPHA, Ethereum) has been designated as a trading caution asset. Customers who hold this virtual asset are asked to review this notice carefully for your reference. Stella (ALPHA, Ethereum) has been designated as a trading caution asset by member firms of the Digital Asset eXchange Alliance (DAXA). DAXA member firms may take measures such as urging caution, designating an asset as a trading caution asset, or terminating trading support in order to protect users. Therefore, customers who hold this virtual asset are asked to review this notice carefully for your reference. Reason for designation as a trading caution asset Stella (ALPHA, Ethereum) was found to have multiple insufficient areas when comprehensively considering factors such as whether and to what extent disclosures related to the virtual asset are made, the transparency of governance and virtual-asset operations, and the level of community activity, and it was confirmed that there is a possibility of causing user harm. Accordingly, to verify the facts related to these matters and prevent other user harm, this virtual asset will be designated as a trading caution asset for approximately 1 month going forward. Notice of deposit suspension Suspension schedule: January 29, 2026 (Thu) 18:00 (KST) Reason for suspension: Designation of Stella (ALPHA) as a trading caution asset Notes ⁃ Coinone will determine whether to extend or lift the designation as a trading caution asset, or to terminate trading support, based on a close review of the relevant virtual asset. The designation period may be extended during the explanation process and review, and if the reasons for the designation are not resolved, trading support may be terminated. In such case, we will inform you through a separate notice. ⁃ If you invest in a virtual asset designated as a trading caution asset, please exercise special caution. - The timing for resumption of deposits will be announced via an update to this notice when the trading caution designation is lifted. ⁃ Regardless of the deposit suspension, withdrawals and trading of the virtual asset can be used normally. ⁃ Please note that if this virtual asset is deposited during the deposit suspension period, it may not be credited. - If your deposit is not credited, please submit a return request and returns will be processed sequentially. Coinone will continue to do its best for a sound and transparent virtual-asset ecosystem. Thank you. Coinone Team This information is generated automatically.

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Coinone Hello, this is Coinone. On Wednesday, January 28, 2026, we will add Sentient (SENT) to the KRW market as follows. Sentient (SENT) Trading Information Expected deposit/withdrawal schedule: - Deposits open: Tuesday, January 27, 2026 17:00 (KST) - Withdrawals open: Wednesday, January 28, 2026 12:05 (KST) Expected trading schedule: - Sell open: Wednesday, January 28, 2026 12:00 (KST) - Buy open: Wednesday, January 28, 2026 12:05 (KST) - Market price reservation price open: Wednesday, January 28, 2026 14:05 (KST) - Reference price: To be updated - Withdrawal fee: To be updated - Supported network: Ethereum Network (ERC-20) Deposits via other networks are not supported. - Block explorer: https://etherscan.io/token/0x56A3BA04E95d34268A19b2a4474DC979baBDaf76 Sentient (SENT) Asset Information Name: Sentient Overview: Sentient builds open and community-driven open-source artificial general intelligence (AGI). Sentient’s main product is GRID (Global Research and Intelligence Directory), the world’s largest intelligence network connecting expert agents, models, data, tools, and computing resources contributed by developers around the world. SENT is Sentient’s utility token and is used for staking, governance, product fees, and as a payment currency. Related materials - Official website - Whitepaper - Key information summary - Virtual asset description Official community - X (formerly Twitter) - Discord - Blog Notes - Items marked “To be updated” among information on supported virtual asset listings and related services will be updated before trading support begins. Please check accordingly. - The start of trading support for the scheduled virtual asset may be postponed or canceled due to circumstances on the issuer’s side or Coinone’s listing standards. - Under the Virtual Asset User Protection Act, unfair trading practices (e.g., use of material non-public information) are prohibited. We ask for your cooperation to maintain a sound market order for virtual asset trading. - When supporting a newly listed virtual asset, only limit sell orders are allowed for the first 5 minutes from the time sell trading opens. - If deposits are made from a virtual asset service provider not included in the Travel Rule solution linkage list, it may take a long time until the assets are returned. - Before depositing virtual assets, please be sure to check the supported network and whether a secondary address such as a memo is required to avoid erroneous deposits. - In the event of an erroneous virtual asset deposit, you may request a return of the assets in accordance with Coinone Customer Center’s guide for returning erroneous deposits. - Coinone provides whitepapers, key information summaries, descriptions, community links, etc. for virtual assets approved for trading support, and strives to review and update them regularly. ⁃ Coinone does not provide any investment recommendations in relation to virtual asset trading. ⁃ Virtual assets are high-risk products and may result in the loss of all or part of your investment. ⁃ When trading virtual assets, please be sure to consider the risk of principal loss due to price volatility. ⁃ For safe trading, we recommend that you first review explanatory materials such as the relevant virtual asset’s whitepaper and related terms and conditions. - Coinone provides whitepapers, key information summaries, descriptions, community links, etc. for virtual assets approved for trading support, and strives to review and update them regularly. - Coinone Co., Ltd. Compliance Officer Review No. 2026-D-14 (2026. 1. 26. ~ 2027. 1. 25.) Thank you. Sincerely, Coinone Team This information is generated automatically.

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