Reviewing the internals of ledger databases

Now that the ledger has been created, we will build on what we have discussed and continue covering more important concepts of QLDB. We will start by discussing the digest, creating a table, and inserting records into this table through queries.

Getting the digest

As we mentioned at the beginning of this chapter, a digest is a cryptographic version of your ledger’s complete history at a specific point in time. This is one of the key components for the verification step, which we will discuss in the Understanding how ledger databases prevent data integrity issues section.

Continuing with our example, locate and click on the radio button beside myBanking to activate the Edit, Query ledger, Get digest, and Delete options. When we click on Get digest, it will generate the digest, as seen in Figure 9.20. This will contain the details that we will use later during the verification step:

Figure 9.20 –...