A TXHASH serves as a unique identifier for transactions on the blockchain, providing a way to easily reference and verify individual transactions. However, the query raises an important point regarding whether a TXHASH by itself is sufficient for certain validation processes or if additional measures, such as digital signatures, are necessary.

Digital signatures play a crucial role in enhancing security and authenticity. They not only confirm that the transaction has not been altered since it was issued but also verify the identity of the parties involved. This dual function addresses potential concerns about the integrity and origin of the transaction, which a TXHASH alone might not fully secure.

In summary, while a TXHASH effectively identifies and tracks transactions on the blockchain, relying solely on it may not suffice for all purposes, especially those requiring heightened security and authentication. Incorporating digital signatures offers a more robust solution by ensuring the transaction's integrity and the sender's authenticity. This layered approach to security underscores the importance of understanding and selecting appropriate verification mechanisms based on the specific needs and risks associated with the transaction or data in question.