TRADRILL / GLOSSARY / TRANSMISSION CHAINS
What Is Point-in-Time Validity?
Category: Transmission chainsChinese: 点时有效
Short definition
Point-in-time validity means each hop's evidence is stamped with an as-of date — the date the source made the fact knowable — so that reading the chain as of an earlier date shows only what could have been known then, and never what was disclosed later.
What it means
A chain is built after the fact, from documents that have different dates. The event happened on one day; the customer-concentration table that sizes a hop was filed months later; the market reacted in between. If the chain presents all of that as one timeless picture, it quietly claims that a reader on the event day could have known the whole thing. They could not. Point-in-time validity is the discipline of stamping every fact with the date it became knowable.
In practice each hop carries an as-of date taken from its evidence — the filing date, the announcement date, the date a page was published — and each company relationship in the graph carries a valid-from date. A view of the chain "as of" some date then draws only relationships whose disclosure date is on or before it, and marks the rest as not yet disclosed. The point is not pedantry: the most common way a hindsight story feels persuasive is that it uses tomorrow's evidence to explain yesterday's move.
The same rule protects the market-reaction section. A note records how prices moved around the event as a matter of record; point-in-time validity keeps the reader from mistaking a hop that was only knowable a quarter later for one that could have driven that move. When the two are separated honestly, the interesting question becomes visible — what was knowable on the day, and how much of the later picture was already in that.
How to tell a chain respects point-in-time
A chain that takes dates seriously shows it in these ways:
- Every hop has an as-of date, and it comes from the evidence, not from the note's publication date.
- The as-of date is on or after the source's date, never before.
- Relationships disclosed after the event are visibly marked as later knowledge.
- The market-reaction section compares the move with what was knowable at the time, not with the full chain.
- Superseded figures are kept with their dates rather than overwritten.
- A view of the chain at an earlier date shows fewer hops, not the same hops with different numbers.
Reading a chain as of a date
The exercise that shows what point-in-time discipline buys:
- 1.Pick the event date and list only the hops whose as-of date is on or before it.
- 2.Write down the exposure picture that subset supports — that is what a diligent reader could have assembled that day.
- 3.Advance to the next disclosure date and add the hop it unlocks; note how the picture changes.
- 4.Compare the day-of picture with the market-reaction record; the gap is the honest measure of what the market priced without the later evidence.
- 5.Repeat on a new event before its later filings exist, and revisit when they do.
Frequently asked questions
Why not just use the note's publication date for everything?
Because a publication date says when the author wrote, not when the fact was knowable. The whole purpose of the as-of stamp is to separate the two so a chain can be replayed honestly; one date for everything would erase that.
What if a source is undated?
Use the earliest date the page can be shown to have existed (an archive snapshot, a dated citation elsewhere) and say so in the evidence note. If no date can be established, the hop goes on the estimated track with that uncertainty listed.
Does an old as-of date make a hop wrong?
No, it makes it dated. A customer share from two years ago is still evidence; the reader just needs to know its age, and a chain that hides the age is the problem, not the age itself.
Related terms & reading
Related terms: Transmission chain · Evidence pack · Evidence entailment · Bar replay
Keep reading: How to Use Bar Replay to Practice Trading
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