I understand that when using Tor in the "normal" way, it can directly access either directory authorities or fallback directories over plain HTTP to start learning about network status and descriptors, then from that point on knowing the identity of each other OR that it contacts, but how does this work with pluggable transports such as Snowflake?

From what I've seen, there's no way for the local OP to know up front the identity of the bridge that it will be connected to when using Snowflake. Does the OP simply proceed with the Tor handshake without verifying the identity of the bridge it is talking to and then starts reading descriptors (via create fast / begin dir), or is there some other mechanism that can be used in bootstrapping when the only path available to connect to the wider Tor network is via a bridge / pluggable transport?

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