Company: GBTC
Filing Date: 2025-02-28
Form Type: 10-K
Source: 0000950170-25-029408
Chunk: 68

Company: Grayscale Bitcoin Trust ETF
Filing Date: 2025-02-28
Form: 10-K
Item: Item 1A
Chunk 68
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net could manipulate the Blockchain to adversely affect the value of the Shares or the ability of the Trust to operate. 

If a malicious actor or botnet (a volunteer or hacked collection of computers controlled by networked software coordinating the actions of the computers) obtains a majority of the processing power on the Bitcoin Network, it may be able to alter the Bitcoin Blockchain on which transactions in Bitcoin rely by constructing fraudulent blocks or preventing certain transactions from completing in a timely manner, or at all. The malicious actor or botnet could also control, exclude or modify the ordering of transactions. Although the malicious actor or botnet may not be able to generate new digital assets or transactions using such control, it may be able to “double-spend” its own digital assets (i.e., spend the same tokens in more than one transaction) and prevent the confirmation of other users’ transactions for so long as it maintained control (over 50%). To the extent that such malicious actor or botnet did not yield its control of the processing power on the Bitcoin Network or the Bitcoin community did not reject the fraudulent blocks as malicious, reversing any changes made to the Bitcoin Blockchain may not be possible. Further, a malicious actor or botnet could create a flood of transactions in order to slow down the Bitcoin Network. 

In an example from another network, in August 2020, the Ethereum Classic Network, a proof-of-work network, was the target of two double-spend attacks by an unknown actor or actors that gained more than 50% of the processing power of the Ethereum Classic Network. The attacks resulted in reorganizations of the Ethereum Classic blockchain that allowed the attacker or attackers to reverse previously recorded transactions in excess of over $5.0 million and $1.0 million. 

In addition, in May 2019, the Bitcoin Cash network, a proof-of-work network, experienced a >50% attack when two large mining pools reversed a series of transactions in order to stop an unknown miner from taking advantage of a flaw in a recent Bitcoin Cash protocol upgrade. Although this particular attack was arguably benevolent, the fact that such coordinated activity was able to occur may negatively impact perceptions of the Bitcoin Cash network. Any similar attacks on the Bitcoin Network could negatively impact the value of Bitcoin and the value of the Shares. 

Although there are no known reports of malicious activity on, or control of, the Bitcoin Network, it is believed that certain mining pools may have exceeded the 50% threshold on the Bitcoin Network. The possible crossing of the 50% threshold indicates a greater