On Apr 6, 2017 6:31 PM, "Tomas via bitcoin-dev" < bitcoin-dev@lists.linuxfoundation.org> wrote:
Bitcrust just uses a *transaction-index*, where outputs can be looked up regardless of being spent. A network in which many nodes maintain a transaction index also enables a class of light node applications that ask peers to prove existence and spentness of TXO's.
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