Not exclusively his, but yes, he's offering a trustless futures contract. Same as nostr:nprofile1qqsvak4cr0jzaarahhn98a9602e94sa2xt8u9dnjac8cns86lzp0z0spp4mhxue69uhkyunz9e5k7tcpzemhxue69uhk2er9dchxummnw3ezumrpdejz7qgwwaehxw309ahx7uewd3hkctcrn5pxz but i believe some exchnages offered it historically....