Re: [bitcoin-dev] PubRef - Script OP Code For Public Data References

[ZmnSCPxj <ZmnSCPxj@protonmail.com>]

Good morning Mike,

>   > The problem with transaction being pruned is that the data in them might now be used in a *future* `OP_PUBREF`.
>
> I can see how pruning is needed for scalability, and pruning can be made compatible with a reference to a transaction. If a transaction is pruned, then the key material used in a prune'ed block's PUSHDATA operations are of no value.  A user of the network shouldn't need to make this kind of PUBREF, and if a user did want to bring a wallet back from the dead - then the utility of PUBREF wouldn't be available to them.

I believe you misunderstand the point completely.

Currently Bitcoin Core has a mode, called pruning, where:

1.  It validates ***all*** transactions.
2.  It throws away the transaction data of a block ***after*** validation.
3.  It keeps only the UTXO set of ***all*** addresses, not just a specific wallet.

Given the above, if a transaction block 1000 `OP_PUBREF`s to a `OP_PUSHDATA` in block 100, how does the pruned validator get access to this data (Which was pruned after the pruned validator handled block 100)?

Note that pruned nodes ***are*** fullnodes and validate all transactions, not just those that involve their wallet.

Regards,
ZmnSCPxj