He addressed that [roughly from memory - //this is not a quote//]: Our concern is that that would reduce the proof of life to a specific methodology. Key manag

He addressed that [roughly from memory - //this is not a quote//]: Our concern is that that would reduce the proof of life to a specific methodology. Key management is complex. Primary proof is social proof, lawyers, Pilger, et al. It would be extremely costly for adversary to create conspiracy involving all these actors.