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We won’t worry too much about how blind signatures are actually constructed, at least not for this post. Let’s just imagine we’ve been handed a working blind signature scheme. Using this as an ingredient, it’s quite simple to build a one-time use anonymous credential, as follows:
，这一点在Line官方版本下载中也有详细论述
const view = byobRequest.view!;
vec2f(0.5, -0.5),