You can check the blacklist of dishonest persons for free through the following methods:

1. Online query: Go to the official website of "Information Disclosure of Untrustworthy Persons Subject to Execution" and click "Breach of Trust" on the page. You can query the results based on the relevant information of the person subject to execution through menus such as "Query the person subject to execution", "Nationwide", and enter keywords.

2. App mobile client query: Download the "Legal Service App", select "Query", and then click "Broken Trustee". Based on the information you want to query, you can query the relevant information of the trustworthy person.

3. Third-party credit reporting agency query: Third-party credit reporting agencies can also query the blacklist of dishonest persons, but because it requires a certain fee, this method is generally not recommended.