Expression of Concern: BlockTicket: A framework for electronic tickets based on smart contract

The PLOS One Editors issue this Expression of Concern because this article [1] was identified as one of a series of submissions for which we have concerns about the peer review process. Readers are advised to interpret the article [1] with caution. Reference Citation: The PLOS One Editors (2026) Expression of Concern: BlockTicket: A framework for electronic tickets based on smart contract. PLoS One 21(5): e0350246. https://doi.org/10.1371/journal.pone.0350246 Published: May 27, 2026 Copyright: © 2026 The PLOS One Editors. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.