A recent survey looked for companies actually implementing blockchain and their experience with it.
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Source: Blockchain for International Development: Using a Learning Agenda to Address Knowledge Gaps | MERL Tech
We documented 43 blockchain use-cases through internet searches, most of which were described with glowing claims like “operational costs… reduced up to 90%,” or with the assurance of “accurate and secure data capture and storage.” We found a proliferation of press releases, white papers, and persuasively written articles. However, we found no documentation or evidence of the results blockchain was purported to have achieved in these claims. We also did not find lessons learned or practical insights, as are available for other technologies in development.
Oops.
Source: Blockchain for International Development: Using a Learning Agenda to Address Knowledge Gaps | MERL Tech