# Further thoughts

## Data sources

Using blockfields from the bitcoin network is the simplest source of data for a NAS. Some other obvious choices could include:

* Data derived from on-chain blockfield, such as [active addresses](https://studio.glassnode.com/metrics?a=BTC\&m=addresses.ActiveCount) or [mean coin age](https://cryptoquant.com/asset/btc/chart/network-indicator/mean-coin-age?window=DAY\&sma=0\&ema=0\&priceScale=log\&metricScale=linear\&chartStyle=line).
* Data from other blockchains such as [ethereum](https://etherscan.io/).
* Real-world data  via oracles such as [Chainlink ](https://chain.link/)or [OriginTrail](https://origintrail.io/).

## Data application

Similarly, the application of this data isn't limited to defining terrain. Some other examples include:

* Resource locations.
* Spawn points.
* Structure location.
* Trees defined by merkel tree hashes.
