Evidence Basics · 10 min read
Chain of Custody for Text Messages: A Practical Record Checklist
What a non-forensic product can track: source files, hashes, timestamps, access, review copies, and report manifests.
The short answer
For text messages, <a href="/evidence-science" class="text-gilt hover:underline font-medium">chain of custody</a> means being able to explain where the record came from, who handled it, what changed at each step, and how a cited line connects back to the source. It is documentation, not a property of the file: nothing about an export authenticates itself, and a hash does not prove where a file originated — only that it has not changed since the hash was taken. A workable record answers four questions in order. Where did this come from: which device, account, or provider, and who retrieved it. When: the date of retrieval, which is not the date of the messages. What has happened to it since: every conversion, redaction, filter, and rename, each noted as its own step. And where is the original: preserved unmodified, separate from every working copy. Written down as you go that takes minutes; reconstructed afterwards from memory, it is the part that tends not to hold. Textimony records an intake checksum and participant confirmation, then organizes parsed messages, software candidates, reviewer decisions, and reports. Keep any broader handling log or source manifest with the matter records.
A practical checklist
Keep the original export or device-derived file separate from working copies. Hash uploaded artifacts and generated reports. Track who created exports, who uploaded them, and when reports were generated. Keep redacted copies separate from unredacted owner records. Record participant mapping decisions and ambiguous identities. Make every cited message traceable to a source file and timestamp.
Why hashes and manifests help
A hash cannot prove a conversation is true by itself, but it can help show whether a file changed after a point in time. A manifest can connect each report to the inputs, settings, and output artifacts used to create it. That combination makes it easier to review the record, reproduce the analysis, and separate raw evidence from interpretation.
Forensic handoff
Some matters require professional forensic acquisition and testimony. Textimony can organize a supported working file for review, while device images, examiner notes, collection records, and testimony remain in the forensic workflow.
Chain of custody is a handling record
For message evidence, <a href="/evidence-science" class="text-gilt hover:underline font-medium">chain of custody</a> is the practical record of who handled the files, when they were exported, where they were stored, whether working copies were made, and which reports were generated from which sources. It is not a magic certificate, but it helps reviewers understand whether the record remained traceable. A consumer-grade workflow can still be disciplined. Preserve the original, hash files when possible, document each copy, and keep generated summaries tied to source IDs. The more sensitive or contested the matter, the more important qualified legal or forensic guidance becomes.
Handling log checklist
Source creator, device or account context, export date, uploader, and upload timestamp. Original filename, storage location, file size, hash when available, and platform or export method. Working-copy filename, cleanup steps, redaction status, timezone assumptions, and transformation notes. Access events, downloads, report exports, deletion requests, and case-sharing actions. Generated artifact names, report hashes, message counts, participant-map version, and analysis settings. Known gaps, missing media, deleted-message claims, unsupported formats, and third-party data concerns. Reviewer notes that distinguish observed source facts from interpretations or legal arguments.
What Textimony records—and what it does not
Textimony records an intake checksum, parsed message fields, participant confirmation, run status, reviewer decisions, and reports. Those records can describe the application workflow, but they are not a complete chain-of-custody log. Keep collection, storage, conversion, access, redaction, and sharing events in a separate handling record. Forensic acquisition, sworn testimony, and court rulings remain outside the product.
Before you share the record
For chain records, the most useful handoff is boring and specific: who exported the file, where it was stored, what copy was uploaded, what report was generated, and whether any redaction or cleanup happened between those steps.
Is chain of custody required for every text message dispute?
No. A formal chain of custody is expected in criminal matters and forensic work, but most civil and family disputes never demand one. Keeping a handling record is still worth the small effort, because it answers the question that does get asked — where this file came from and whether it changed since. The cost of maintaining one is trivial next to reconstructing it under challenge.
What is a file hash?
A hash is a fixed-length value calculated from a file’s exact contents, usually with an algorithm such as SHA-256. Change a single character and the value changes completely, so comparing a hash recorded at intake against one calculated later shows whether the file is byte-for-byte identical. It proves nothing about who made the file or whether its contents are true — only that it has not been altered since you recorded it.
Can Textimony create a forensic chain of custody?
No. Textimony records a limited set of application facts — the intake checksum, run status, participant confirmation, reviewer decisions, and generated reports — which covers what happened inside the software and nothing before it. A forensic chain of custody documents physical and logical handling from acquisition onward, using validated methods and a qualified examiner. Keep a separate handling log covering how the file reached you.
Why track generated reports?
Because reports circulate and change while the source stays fixed. A report gets shared, revised after a new export arrives, or redacted for disclosure, and versions then coexist. Without a record connecting each one to the source data and settings that produced it, you cannot explain why two reports of the same conversation differ — and that difference is exactly what an opposing party will ask about.
Published by
Textimony. Editorial status: Source-linked informational guide. Updated: 2026-07-10.
Sources
NIST: Guidelines on Mobile Device Forensics; NIST: Digital Evidence Preservation; Federal Rule of Evidence 901