bootstrap$ contains the DDL statements to create other bootstrap tables.
The text in sql_text in the table bootstrap$ corresponds to the first SQL statements found in the sql.bsq script (which is executed as part of a database creation).
Accordingly, the last statement recorded in bootstrap$ is the CREATE TABLE BOOTSTRAP$ …:
The statements recorded in bootstrap$ are also executed when starting up an instance between the mount and open stage.
select
bts.line#,
obj.name,
bts.sql_text
from
bootstrap$ bts left join
obj$ obj on bts.obj# = obj.obj#
order by
bts.line#;