In the past, trust was purely social (think the caveman days). Then it switched to trusted institutions (banks, governments, companies) which was a step up, but we still had to rely on the other parties goodwill, or their incentive to behave in the right way.
The problem today is that institutions have become the sole gatekeepers of trust. We are

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Crypto has one feature that has never existed before - trust. - Ben Horowitz

La blockchain (ici celle du Bitcoin) remplit bien sa promesse de rendre possibles des transactions numériques sécurisées en pair à pair (donc sans intermédiaire). Sur un point toutefois, l’engagement n’est qu’à moitié tenu : les participants n’opèrent pas sans aucune identification, comme le voudrait un système véritablement anonyme (quand nous

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Satoshi Nakamoto’s invention is also a practical and novel solution to a problem in distributed computing, known as the “Byzantine Generals’ Problem.” Briefly, the problem consists of trying to get multiple participants without a leader to agree on a course of action by exchanging information over an unreliable and potentially compromised network.

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