Our entire work is public and open source Github.com/horizontalsystems

As we integrate various blockchain protocols into our apps we also provide community with turnkey blockchain libraries for building trully decentralized applications that run entirely on blockchain and distributed storage solutions.

With the help of these libraries developers are able to build decentralized applications considerably faster.

BTC
Bitcoin SPV Client
Full SPV toolkit implementation for Bitcoin and Bitcoin Cash blockchains. These libraries enable any developer to build true decentrazlied apps on top of Bitcoin and Bitcoin Cash blockchains.
Swift
Swift (iOS)
Kotlin
Kotlin (Android)
BTC
Ethereum Light Client
Light client implementation for Ethereum blockchain.

Build any kind of decentralized applications on top of Ethereum blockchain without getting your hands dirty dealing with protocol. Note: The light client implementation is work in progress and can be closely followed in respective branches of the repositories below. Nearly done!
Swift
Swift (iOS)
Kotlin
Kotlin (Android)