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Last-Seen & Timeline

last-seen-analysisosinttimelinelast-seencorroborate

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Full lesson · 8 learning steps Open any exercise for focused practice

Step 1 of 8 · intro card

Learn Last-Seen & Timeline

Missing Persons

Investigators reconstruct a public-data timeline from the last confirmed sighting — frequented locations, known associates, and public account activity — corroborated across multiple independent sources. This builds leads for the professionals working the case, always from public data.

The timeline starts at the anchor: the last confirmed, verifiable sighting of the person. Everything else is built outward from that fixed point in time and place.

From there, analysts add frequented locations, known associates, and public account activity — all from openly available information — to sketch where the person was and who might know more.

No single source is trusted on its own. Each element is corroborated across multiple independent sources, so what reaches the case file is a verified lead rather than a rumor.

Anchor everything on the last confirmed sighting.

Add public locations, associates, and activity.

Corroborate every lead across multiple sources.

timeline:
  anchor: last-confirmed-sighting
  locations: places-frequented
  contacts: known-associates
  digital: public-account-activity
  corroborate: multiple-sources

Read the implementation

Connect each part of the code to the concept before you type.

1. The anchor

The timeline is anchored on the last confirmed, verifiable sighting.

anchor: last-confirmed-sighting

2. Known places

Publicly known places the person frequented give the timeline geography.

locations: places-frequented

3. Public network

Known associates from public connections map who might have information.

contacts: known-associates

4. Public activity

Only public account activity is used to place events in time.

digital: public-account-activity

5. Cross-check

Every lead is corroborated across multiple independent sources before it counts.

corroborate: multiple-sources

A complete learning loop

Understand

Read the concept map and follow the code breakdown.

Reconstruct

Type the implementation, repair mistakes and work through every recall exercise.

Verify

Use the final check without hints; revisit weak concepts in short practice sessions.