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description=Build tamper-evident services and cryptographically prove that the data hasn’t been unexpectedly changed.;

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an open source append only ledger trillian transparency dev applications 2026 summit articles blog applications 2026 summit articles blog trust your data with a tamper evident log you need to trust the data you rely on your organisation handles more data every day and the data helps you make critical decisions but you need to know that it hasn t been modified or corrupted building with tamper evident logs means you can cryptographically prove that the data hasn t been unexpectedly changed knowing the provenance integrity and sequence your data was created means you ll be able to monitor third party ecosystems and simplify regulatory compliance you can trust the data you rely on a tamper evident log stores an accurate immutable and verifiable history of activity this is an example of a verifiable system you could use them to track credits and debits in banking transactions access logs to sensitive healthcare records cryptographic hashes of software packages compliance artifacts of regulated activities or modifications to a document join the community welcome to transparency dev a community dedicated to promoting transparency across various ecosystems and pioneering its integration into new application domains get started by joining our slack channel watch talks from past transparency dev summits on our community youtube channel about transparency dev summit 2026 tamper evident logs are relied on by provides a shared global view of the hash of every software module enabling reproducible builds a verifiable ecosystem helps detect misbehaviour of certificate authorities by enforcing that all certificates are in a verifiable log a non profit public good software signing transparency service discourage insider threats a tamper evident log makes it impossible for a malicious insider to cover their tracks a tamper evident log discourages malicious behaviour by increasing the chance of discovery learn how you can permanently log all actions performed on your servers key transparency protects users against malicious insiders by making key updates visible learn how end to end encryption providers can use a tamper evident log to strengthen key discovery simplify regulatory compliance a tamper evident log keeps you in control of your audit artifacts and gives auditors confidence regulated industries require companies to collect and retain many types of compliance records auditors need to verify the integrity and nonrepudiation of those records by using a tamper evident to store compliance records you can keep them in one place and simplify presenting them to an auditor you can cryptographically prove they haven t been tampered with a tamper evident log is a more efficient way of presenting compliance records to an auditor who can easily verify their history and integrity learn how you can permanently log all actions performed on your servers monitor third party ecosystems a tamper evident log enables multiple parties to monitor each others actions where organisations can be required to publish data about their actions a tamper evident log can hold a permanent record of this data certificate transparency discourages misbehaviour of certificate authorities by making their actions public learn how a tamper evident log enables anyone to monitor certificate authorities tamper evident logs can frustrate software supply chain attacks by providing a shared global view of the content of packages learn how a tamper evident log enables go developers to verify that software packages haven t been tampered with applications of tamper evident logs add tamper checking to a package manager reliably log all actions performed on your servers strengthen discovery of encryption keys with key transparency discourage misbehaviour by third parties in certificate transparency start verifying to get more from your log often people just put everything in the log and stop there for a system to be valuable to you and those that rely on it you need to identify what s important to log and who will verify its contents we ve designed two exercises to help you get started how to design a verifiable system learn more about tamper evident logs benefits of tamper evident logs verifiable data structures applications of tamper evident logs add tamper checking to a package manager reliably log all actions performed on your servers strengthen discovery of encryption keys with key transparency discourage misbehaviour by third parties in certificate transparency privacy