Majority attack against a new blockchain with few miners?

Majority attack against a new blockchain with few miners?

My friend wants to create a new blockchain to verify a type of transaction (details unimportant). His computer would probably be the only one doing mining / verifying the transactions, at least for the first few weeks. My understanding is that someone could come in and change months worth of blocks pretty easily if they brought enough computing power.

Am I correct in this understanding, and are there ways to prevent this from happening when creating a new blockchain with few miners?

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