I've been looking for a way to easily monitor all address with a balance, that the balance has not moved/changed for a period of time (based on a criteria such as 1 year). Is there a site/tool already available? or do I need to build it myself? if I have to build it, where can I start to look for the relevant data? Thanks
In aggregate, this is shown in BitcoinDays Destroyed (e.g., unspent for one year or more).
This can be done with some degree of effort using the Bitcoin API.
v0.7 getrawtransaction gives you access to transactions even those not in your wallet.
There are other tools that you can use to build this capability as well.
- Armory (see Extras)
- Bitcoin ABE