While working on taproot support for transactionfee.info, it became apparent that there already exist a few Pay-to-Taproot (P2TR) outputs on mainnet. Anyone can spend these outputs, but they are non-standard and thus not relayed between nodes in the Bitcoin peer-to-peer network. However, a mining pool can include non-standard transactions in their block. We cover the six P2TR outputs already present on mainnet and explain why the outputs can be spent by anyone before taproot activates. With t...
