BoldData only works with databases that are updated daily. All decision makers are called every year to check their details. Moreover this IT database is continuously updated by various sources such as Internet and deep web (big data). Local Commercial Register of the Chamber of Commerce, Municipal Population Distribution Facilities, Central Insolvency Registers for receiverships and bankruptcies, Central Statistics Offices, Market Reports, News and press releases, IT Publishers, IT Branch Organisations and online and offline questionnaires. In short: the quality and accuracy are outstanding. However, a mailing list can never be 100% up-to-date. For example, a contact that has been checked last week can have a new job the next week. Therefore you need to take a small error rate into account..