A milestone releases only when its condition is proven. Pontis ships six verifier modes so the proof fits the deal rather than forcing the deal to fit the tool.
The six modes
Dual sign-off (both parties confirm), time/deadline (with deemed approval), document hash (an upload matches an agreed SHA-256), API webhook (a signed event from an external system), oracle (a certified feed crosses a threshold), and accredited verifier (an independent third party attests).
Every verification is signed
Whatever the mode, the verification is signed and appended to the obligation's tamper-evident audit chain, with the evidence reference and the actor recorded. Disputes then have an evidence base, not an argument.