Como saber o quanto de bitcoins você tem?

How can one accurately determine the amount of bitcoins they possess? Is there a specific process or tool that should be utilized for this purpose? Are there any common mistakes or misconceptions that one should be aware of when attempting to ascertain their bitcoin holdings? Moreover, is there a need to regularly update or verify this information, given the dynamic nature of cryptocurrency transactions? Lastly, how does the process of determining bitcoin ownership differ from that of other types of digital assets or traditional financial instruments?