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. 2019 Aug 14;21(8):e13600. doi: 10.2196/13600

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©Michael Jones, Matthew Johnson, Mark Shervey, Joel T Dudley, Noah Zimmerman. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 14.08.2019.

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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Private blockchain where it represents a secure data environment but requires similar trust as other centralized techniques (participant consent to release data, trusted parties). For this reason, the entire private blockchain network is highlighted in gray.