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. 2020 Jun 2;22(6):e18938. doi: 10.2196/18938

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©Tomonobu Hirano, Tomomitsu Motohashi, Kosuke Okumura, Kentaro Takajo, Taiyo Kuroki, Daisuke Ichikawa, Yutaka Matsuoka, Eisuke Ochi, Taro Ueno. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 02.06.2020.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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At the end of the clinical trial, the app extracts the secret hash key from the smartphone and sends it to the blockchain network via relay servers.