We’re lucidity.tech, currently we have sidechain which checkpoints a Merkle root to a smart contract every few minutes. This application is used by live customers and we need it to be on a a real testnet and not an internal testnet. We’re working on making this available on the mainchain but still have development to do.
You can see a screenshot of the client dashboard here:
The live contract is here: https://kovan.etherscan.io/address/0xed5c55f91c1e5b810d7fd9202d4d496ed0e4e8e8
And the source code here: https://github.com/luciditytech/andromeda
The address we need this sent to is: 0x1B380DC721280DdBD4E0Cbf342Bf2c23A5FEC96A