Important: The tsa.crt certificate has been updated and modernized. The validity of timestamps from March 16, 2026, is until February 2040. The time stamps now use Elliptic-curve cryptography P-384 (secp384r1). The old certificate (no longer valid as of March 2026) can be downloaded here: Freetsa 2016-2026 Old TSA Certificate: tsa.crt_expired

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Trusted timestamping is the process of securely keeping track of the creation and modification times of a document. Security here means that no one - not even the owner of the document - should be able to change it once it has been recorded provided that the timestamper's integrity is never compromised. FreeTSA trusted timestamping Software as a Service (SaaS) provides an easy method to apply RFC 3161 trusted timestamps to time-sensitive transactions through independently verified and auditable date and UTC (Coordinated Universal Time) sources.

Adding a trusted timestamp to code or to an electronic signature provides a digital seal of data integrity and a trusted date and time of when the transaction took place. Recipients of documents and code with a trusted timestamp can verify when the document or code was digitally or electronically signed, as well as verify that the document or code was not altered after the date the timestamp vouches for. (Readme).

For multiple files, the general concept is that timestamping a single file that contains an aggregate list of fingerprints of other files, also proves that these other files must have existed before the aggregate file was created, provided that both the aggregate file and the referenced file are available during verification process. Freetsa also offers the possibility of URLs timestamps (do not abuse). If you are interested in implementing timestamps on your project / company using the FreeTSA service, you can contact me for specific requirements. Freetsa can also be used within the Tor anonymity network.

Making timestamps from Android/iOS devices is possible and no software installation is required (Video). To timestamp a picture you must go to the "Online Signature" section in the browser, click "Choose a file" and select "Use camera". Once the photo or video are completed, you can download the timestamp (TimeStampResponse). Just that. You also may select any other file available in the device if you choose so.

Freetsa.org offers free OCSP and CRL, NTP, DNSCRYPT, DNS (Port 53) and DNS over TLS (DoT) services for time synchronisation and encrypted name resolution respectively. The resolution of DNSCRYPT (Port 553) do not have any type of restriction (SPAM, Malware, Parental,...). No logs are saved. Like the rest of the services offered by FreeTSA, DoT accepts TCP connections to port 853 on all its IPv4/IPv6 addresses.

Guide: How to sign PDF documents files with time stamp
FreeTSA onion domain (Tor): 4bvu5sj5xok272x6cjx4uurvsbsdigaxfmzqy3n3eita272vfopforqd.onion (https /http).
RFC 3161 TSA: Time-Stamp Protocol (TSP).
RFC 958 NTP: Network Time Protocol (NTP).
SSL Labs. Certificate Transparency NTP Pool Project associate membership.

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Here is a comprehensive guide to building complex family relationships and gripping dramatic storylines in your fiction. 1. The Core Dynamics of Family Complexity

Writing an engaging family drama requires a delicate touch. Without proper grounding, complex relationships can devolve into melodrama or soap-opera cliches. Here is how to elevate your domestic storytelling: 1. Give Every Character a Justifiable Perspective

Why do we care about fictional families more than fictional corporate boardrooms? The answer is biological. We are all born into a dynamic we did not choose. Whether your childhood was idyllic or traumatic, the family is the lens through which you learned to see the world. Consequently, when an author writes a scene of a father refusing to apologize or a sister keeping a devastating secret, the reader doesn’t just understand the conflict intellectually; they feel it viscerally in their own ribs.

A character can fiercely protect their sibling while silently envying them. In Succession , the Roy children scheme against each other yet share a desperate, toxic longing for their father’s approval. That push-pull— I hate you, don’t leave me —is the engine of great family drama.

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Here is a comprehensive guide to building complex family relationships and gripping dramatic storylines in your fiction. 1. The Core Dynamics of Family Complexity

Writing an engaging family drama requires a delicate touch. Without proper grounding, complex relationships can devolve into melodrama or soap-opera cliches. Here is how to elevate your domestic storytelling: 1. Give Every Character a Justifiable Perspective

Why do we care about fictional families more than fictional corporate boardrooms? The answer is biological. We are all born into a dynamic we did not choose. Whether your childhood was idyllic or traumatic, the family is the lens through which you learned to see the world. Consequently, when an author writes a scene of a father refusing to apologize or a sister keeping a devastating secret, the reader doesn’t just understand the conflict intellectually; they feel it viscerally in their own ribs.

A character can fiercely protect their sibling while silently envying them. In Succession , the Roy children scheme against each other yet share a desperate, toxic longing for their father’s approval. That push-pull— I hate you, don’t leave me —is the engine of great family drama.