[bitcoindev] UTXO checkpoint transactions

[Erik Aronesty <erik@q32.com>]

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Has it been considered to add a UTXO checkpoint transaction

Here's how it would work

Someone submits a transaction that contains a large fee and a hash of the
UTXO set along with block height as opcode parameter

Miners refuse to include this transaction unless the hash of the UTXO set
matches

Because performing that hash is expensive, it should have an extremely high
cost factor, equivalent to say a 100KB transaction or something

These checkpoints are explicitly for the purpose of fast-synchronizing
extremely lightweight nodes.  It's reasonable to refuse to use a checkpoint
that isn't at least several months old.   It should be easy for anyone to
find a sufficiently aged checkpoint and synchronize from that point onward.


Or is this just a solution without a problem?

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