A Blockchain is a distributed public ledger maintained by multiple peers over a peer-to-peer network, each of whom can have a full copy of the ledger.
Blockchain vs Public Bulletin Board for Integrity of Elections and Electoral Rolls Prashant Agrawal, Subodh Sharma, Subhashis Banerjee 20 AUG 2021 https://www.theindiaforum.in/article/blockchain-vs-public-bulletin-board-integrity-elections-and-electoral-rolls When the Election Commission is the sole decider of a public ledger, the use of Blockchain to conduct polls & maintain voter lists may result in an unverifiable & highly insecure solution. A simpler cryptographic-secured public bulletin board will suffice.
..the two properties of block chain..( append only after "consensus", and non-alterability after chained, ) by themselves do not ensure that elections become safe; actually they are somewhat orthogonal (independent) to correctness of voting. Proclaiming elections to be correct would require providing publicly verifiable guarantees— even against possible insider attacks—that votes are cast as intended, recorded as cast and counted as recorded.
A permissioned Blockchain may be highly insecure when there are no multiple mutually adversarial entities to ensure the integrity of the bulletin board by consensus, and the ECI is the sole authority to decide on what information should be displayed on the bulletin boards. That would tantamount to reposing unverifiable trust in the ECI. In fact, the possibility of collusion among the trustees always remains in permissioned Blockchains, and `51% attacks’—where dishonest peers form the majority in the Blockchain network—have also been orchestrated on permission-less ones (Proskauer - Blockchain and the Law, 2020).