How do legal teams prove the final signed version after execution?

How do legal teams currently handle proof of the final signed version after an agreement is completed? I’m interested in the post-signature side of legal workflows. Most legaltech discussion focuses on drafting, review, negotiation, e-signature and matter management. But I’m curious about what happens after execution, when the completed document is downloaded, renamed, emailed, stored in a DMS, attached to a matter file, sent to a client, or handed over internally. In practice, how do firms or legal teams prove later that: * a particular PDF was the final signed version * the file has not changed since execution * the document being relied on is the same one that was completed * the proof can still be understood months or years later outside the original signing platform Is this usually solved well enough by e-signature audit trails and document management systems, or is there still a gap around long-term agreement verification? I’m especially interested in how this is handled in conveyancing, commercial contracts, procurement-heavy matters and client-facing legal workflows. [Which version is the last version?](https://preview.redd.it/xqp85lgb283h1.jpg?width=1024&format=pjpg&auto=webp&s=58a07944df6a4f2ecf8a99320de1b1c5e97210c6)