Greetings! We are presenting a paper: “Blockrate Binaries on Bitcoin mainnet.” This is a formalization of the previously known Powswap[1] protocol. These hashrate derivatives are off-chain contracts to make peer-to-peer binary contracts on the future rates of block discovery between two users. Link: https://github.com/blockrate-binaries/paper/blob/master/blockrate-binaries-paper.pdf (also attached here) Sha256 of current version of paper: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 We describe protocol steps in detail and the threat model, which largely overlaps with other protocols (e.g., eclipse, pinning, miner bribe). A unique characteristic of this protocol is contentions -- ie transaction confirmation racing -- in edge cases. We discuss issues around contention at the most basic level, leaving advanced mining-related game theory for future research. Deploying these contracts at scale would require novel infrastructure for counterparty discovery and selection, which we describe in the paper. Part of this infrastructure could be shared with Discreet Log Contracts or other protocols. Blockrate Binary Options could operate on top of Lightning payment channels, although the exact construction requires further protocol design, especially for the routed version. We briefly discuss this, as well as other potential advancements for these contracts. It is yet to be established whether Blockrate Binary options are useful financial tools for Bitcoin users. We believe that they may be useful to miners for hedging their operations; and to all Bitcoin users by making Bitcoin a more salable asset through bridging it to real-world energy flows and providing a decentralized price indicator and a means of derivative trading. We welcome protocol researchers to help us solve the remaining blockers. Most important are contention and lightning compatibility. We also invite experienced core and lightning software developers who can work out a beta implementation to start trying this out "recklessly" in the not too distant future. If there is interest, we will set up infrastructure for community forums and contributions soon. Thanks Gleb Naumenko and Antoine Riard for so much careful thought and work. And thanks to Nadav Kohen for review before publication. Private inquiries can be directed to myself at this email. 1 Powswap was originally introduced by Jeremy Rubin. See powswap.com and Advent Day 24.