Bitcoin was designed with a specific trust model in mind. The most well known point of trust in 51% attacks. Lesser known is bitcoin master nodes. Even lesser

Bitcoin was designed with a specific trust model in mind. The most well known point of trust in 51% attacks. Lesser known is bitcoin master nodes. Even lesser realised is the trust that your client is connected to the broader bitcoin network (and not segregated somehow). This also assumes trust in your client, which can also perform all kind of attacks (such as not reusing R values: https://bitcointalk.org/index.php?topic=581411.0 https://bitcointalk.org/index.php?topic=581411.0) There's no such thing as no trust, only different threat models. I'd reccomend reading https://www.threatmodelingmanifesto.org/ https://www.threatmodelingmanifesto.org/