in src/main/java/software/amazon/qldb/QldbHash.java [71:80]
public static QldbHash toQldbHash(IonValue value, IonSystem ionSystem) {
IonReader reader = ionSystem.newReader(value);
IonHashReader hashReader = IonHashReaderBuilder.standard()
.withHasherProvider(HASHER_PROVIDER)
.withReader(reader)
.build();
while (hashReader.next() != null) {
} // read the IonValue
return new QldbHash(hashReader.digest(), ionSystem);
}