On Sun, Dec 20, 2015 at 6:24 AM, Peter Todd via bitcoin-dev < bitcoin-dev@lists.linuxfoundation.org> wrote:
> What I proprosed is that a consensus-critical maximum UTXO age be part > of the protocol; UTXO's younger than that age are expected to be cached. > For UTXO's older than that age, they can be dropped from the cache, > however to spend them you are required to provide the proof, and that > proof counts as blockchain space to account for the fact that they do > need to be broadcast on the network. Yes, this is almost what -has- to happen in the long term. Ideally we should start having wallets generate those proofs now, and then introduce the max-age as a second step as a planned hard fork a couple years down the line. However, 1) There is also the open question of "grandfathered" UTXOs - for those wallets generated in 2009, buried in a landfill and then dug out 10 years ago 2) This reverses the useful minimization attribute of HD wallets - "just backup the seed"
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