Miners who use clean energy sources to mine bitcoin apply to the Sustainable Bitcoin Standard for certification.
The Sustainable Bitcoin Standard verifies that bitcoin was mined using green energy and issues a Sustainable Bitcoin Certificate for each BTC mined, built as a smart contract on the Stacks blockchain.
The Sustainable Bitcoin Certificate allows miners and investors to make sustainability claims for BTC in their possession without disrupting fungibility.
Carbon-conscious investors can purchase verified "Proof of Sustainable Mining" practices by acquiring SBCs, either directly from miners, via the SBS platform, or various exchanges.