# Gavin Andresen
# 2011-11-30 16:29:59
# https://bitcointalk.org/index.php?topic=52859.msg635603#msg635603

@s{quotedtext}
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So go implement it and see how well it works. @p{par}

Create a little HTTP-based protocol with, oh, three methods: @p{brk}

@p{(li}You send a block height or block hash, you get back a ledger hash.@p{li)}

@p{(li}You send a ledger hash, you get back the full ledger or an "I have no idea what you're talking about, that's not a valid ledger hash".@p{li)}

@p{(li}You send two ledger hashes, you get back the changes from one to the other or an "I have no idea what you're talking about, one of those isn't a valid ledger hash".@p{li)}
 @p{brk}
Then you just need to convince a bunch of semi-trustworthy people to run "ledger servers." And maybe have some mechanism for reporting when a ledger server has a bug or 'goes rogue' and reports a ledger hash that is different from everybody else. @p{par}

Oh, and you might need to solve the incentive problem of "why would I run a ledger server if I'm not paid for it" (and maybe write a bunch of denial-of-service-prevention code in case some jerk with a botnet decides to ask for 10,000 full ledgers from 10,000 different IP addresses).