Hi Wladimir,

If the motivation of the SPV wallet is to radically extend functionality, as in 
my case, then the index is specific to the added features and the subset of the 
blockchain that is of interest for the wallet.
As you also point out, adding huge generic purpose indices to core would rather 
discourage people using full nodes due to excess requirements. 

I believe nothing would add more to the core’s popularity as a trusted 
background node to SPV than full validation at lowest possible memory, disk and 
CPU footprint.
Serving headers should be default but storing and serving full blocks 
configurable to ranges, so people can tailor to their bandwith and space 

Tamas Blummer
Bits of Proof

On 09.04.2014, at 21:25, Wladimir <laa...@gmail.com> wrote:
> Adding a RPC call for a "address -> utxo" query wouldn't be a big deal. It 
> has been requested before for other purposes as well, all the better if it 
> helps for interaction with Electrum.
> Spent history would be involve a much larger index, and it's not likely that 
> will end up in bitcoin
> Wladimir

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