![dapp-a-day-11 2x](https://cloud.githubusercontent.com/assets/6280810/17872851/6159d552-68c2-11e6-9e2d-dfde668f1d42.png)

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**Each weekday leading up to devcon2, Nexus will highlight a dapp, library, or package (something with a `dappfile`) as a promotion of our toolchain and as case studies for other developers. [Previous Post](https://steemit.com/ethereum/@nikolai/dapp-a-day-10-cross-chain-btc-trade-via-btc-relay)**

Today's dapp demonstrates one opinionated whitelist design.

https://github.com/nexusdev/ds-whitelist

It is also an alternative `DSAuthority` implementation `DSBasicAuthority`: It is an address whitelist. It can be used directly with `isWhitelisted` or to glue together a system via `auth` as single "root" permission level.

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![dapp-a-day-11-head 2x](https://cloud.githubusercontent.com/assets/6280810/17872909/cf6edd8a-68c2-11e6-82e9-a8121c1c6fc8.png)

### Recent articles
[Dapp-a-day 10: Cross-Chain BTC Trade via BTC-Relay](https://steemit.com/ethereum/@nikolai/dapp-a-day-10-cross-chain-btc-trade-via-btc-relay)
[Dapp-a-day 9: Reverse ("Demanding") Token Auction](https://steemit.com/ethereum/@nikolai/dapp-a-day-9-reverse-demanding-token-auction)
[Dapp-a-day 8: Splittable Token Auction](https://steemit.com/ethereum/@nikolai/dapp-a-day-8-splittable-token-auction)
[Dapp-a-day 7: OTC Token Trades](https://steemit.com/ethereum/@nikolai/dapp-a-day-7-otc-token-trades)
[Dapp-a-day 6: Upgradeable Tokens](https://steemit.com/ethereum/@nikolai/dapp-a-day-6-upgradeable-tokens)
[Dapp-a-day 5: Easy Multisig](https://steemit.com/ethereum/@nikolai/dapp-a-day-5-easy-multisig)
[Dapp-a-day 4: Access Control via `auth`](https://steemit.com/ethereum/@nikolai/dapp-a-day-4-access-control-via-auth)

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*[Nexus Development](https://nexusdev.us)*
*[nexusdev@github](https://github.com/nexusdev)*