Title:

Why are there no BIP 69 functions in Core Qt Coin Control?

Introduction:

Core Qt, the cryptocurrency wallet developed by Bitcoin Core, is one of the most popular wallets for storing and managing cryptocurrencies. However, despite its widespread use, there seems to be a significant problem with the BIP 69 functions in Core Qt Coin Control. In this article, we will examine why this might be the case and explore possible solutions.

What are BIP 69 functions?

BIP 69 is an extension to the Bitcoin protocol that allows the creation of new keys (also known as addresses) outside of the traditional cryptographic hash functions used by Bitcoin Core. These functions allow users to create unique addresses without generating a new private key, making it easier to manage and store multiple assets.

Why are there no BIP 69 functions in Core Qt?

The reason for this problem lies in the way Core Qt implements BIP 69 functions. According to an anonymous developer, Core Qt uses a combination of lexicographic order of input and order of output (SOIO) analysis to fingerprint transactions. This means that instead of generating a new private key for each transaction, Core Qt uses a complex algorithm to determine the order in which inputs are combined with existing keys.

The problem:

A major problem occurs when trying to create BIP 69 facilities with Core Qt. Because SOIO analysis is used to fingerprint transactions, it can produce inconsistent results even when the inputs and outputs are identical. This inconsistency means that the same transaction input/output pairs produce different fingerprints, making it impossible to uniquely identify each facility.

Why other analysis methods are used:

Another reason why BIP 69 facilities in Core Qt are not as robust is that other analysis methods, such as hash functions (e.g. SHA-256), are used to fingerprint transactions. While these methods provide better consistency than SOIO analysis, they cannot produce unique fingerprints even when inputs and outputs are identical.

Conclusion:

The current implementation of BIP 69 functions in Core Qt coin control is not robust enough to support the creation of new keys (addresses) outside of the traditional cryptographic hash functions used by Bitcoin Core. This issue may seem minor, but it has significant implications for users who rely on these functions to manage their cryptocurrency holdings.

Possible solutions:

Although no immediate solutions are available, some developers propose alternative approaches that could improve the generation of BIP 69 features:

• Use hash functions: Instead of relying on SOIO analysis, Core Qt could use a different hash algorithm (e.g. SHA-256) to fingerprint transactions.

• Implement a more robust algorithm: Researchers and developers have proposed various algorithms (e.g. SipHash) that could provide better consistency and uniqueness for BIP 69 facilities.

Conclusion:

The BIP 69 facilities issue in Core Qt coin control is a fascinating example of how vulnerable cryptographic protocols can be to inconsistencies. While there are no immediate solutions, exploring alternative approaches can help improve the robustness of these facilities and support users who rely on them to manage cryptocurrencies.