Register 05 · Game theory.

Twelve marks · strategic interaction primitives · same construction · 12 marks · one of the 17 registers on the Backstaff.

This register is one face of the Backstaff evidence system — the held instrument that holds the measurement engine, maps compliance controls, and engraves every evidence record into a register of record. The full reference library lives at /corpus; the alphabetical view at /corpus/glossary; the operator view at /corpus/switchboard.

API path

Try the evidence path in the sandbox.

The Console shows the sealed evidence and lets anyone verify a record; the Docs carry the endpoints behind it.

Open the Console Read the Docs Read the capability briefing

01 ·

Marks.

12 source marks in this register.

Payoff Matrix#01 · strategy

normal form · 2×2 game

Reference Paper

Nash Equilibrium#02 · strategy

best-response fixed point

Reference Paper

Extensive Form#03 · strategy

game tree · sequential moves

Reference Paper

Mixed Strategy#04 · strategy

probability distribution over actions

Reference Paper

Cooperative#05 · strategy

surplus sharing · core solution

Reference Paper

Zero-Sum#06 · strategy

strict conflict · Σ = 0

Reference Paper

Prisoner's Dilemma#07 · strategy

dominant defection · (D,D)

Reference Paper

Minimax#08 · strategy

saddle point · worst-case bound

Reference Paper

Coalition#09 · strategy

winning subset · Shapley value

Reference Paper

Repeated Game#10 · strategy

iterated play · folk theorem

Reference Paper

Auction#11 · strategy

mechanism · bid clearing

Reference Paper

Signaling#12 · strategy

asymmetric info · costly type reveal

Reference Paper

API ·

When a regulator asks for proof, hand over records — not assurances.

record the duty · seal the receipt · verify offline

Planisphere records each duty event — an output marked, a disclosure shown, a review made — and seals it into a receipt that verifies offline against our published keys. You send hashes, never content. A record is evidence a third party can check; it is not a certification and not a legal determination.

Open the Console Read the Docs Read the capability briefing

See how a record is checked