BDR consensus algorithm

Hi,

Can anyone provide a pointer a description of the bidirectional
replication global sequences consensus algorithm?

The documentation says:
"BDR uses a voting/election system to assign blocks from global
sequences. The details are in the source code."
https://wiki.postgresql.org/wiki/BDR_Global_Sequences#How_global_sequences_are_managed_internally

But I can't find anything in the source remotely resembling an algorithm
like PAXOS or RAFT.

kind regards,
Peter Mogensen

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