Computer-implemented method for proving presence of digital document, anonymously proving presence of digital document and verifying data integrity of digital document

Database management of a system for proving the presence of a digital document, for anonymously proving the presence of a digital document, for proving the presence of a digital document, and for verifying the data integrity of a digital document, provides increased reliability, security, and enhances trust from users and third parties. 用于证明数字文档的存在、用于匿名证明数字文档的存在、用于证明数字文档的存在的系统的数据库管理、以及用于验证数字文档的数据完整性的改进的计算机实现的方法，提供了增加的可靠性、安全性，并增强了来自用户和第三方的信任。