ChainCatcher news, according to Blockworks, the Human Rights Foundation (HRF) has launched 10 bounty challenges, offering a total reward of 20 BTC, with each challenge having a bounty of 2 BTC, to support open-source Bitcoin developers in building tools and services that enhance Bitcoin functionality.It is reported that the first challenge is to open-source a Bitcoin UI toolkit on Penpot; the second challenge involves serverless implementation of the payjoin protocol; the third bounty is for creating an end-to-end encrypted group chat implementation of a Nostr client.