You can apply for the testnet program by going to the sBTC Developer Release landing page
. The 150 most qualified developers and users will be included in the program.
The Stacks Foundation has set up a prize pool of up to $50,000 to reward active testers who complete tasks and submit bounties during the feedback window. This is optional and only applicable to the applicants willing to pass KYC. Developers are also welcome to go their own route using the testnet documentation and tutorials provided.