This is a quote from the book "B-Money" by Wei Dai
...casted on this channel remain thesame as in the first protocol, but the affected participants of eachtransaction should verify that the message has been received andsuccessfully processed by a r
andomly selected subset of the servers.
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Since the servers must be trusted to a degree, some mechanism is needed tokeep them honest. Each server is required to deposit a certain amou
nt ofmoney in a special account to be used as potential fines or rewards forproof of misconduct. Also, each server must periodically publish andcommit to its current money creation and money own...