Yea there are a few, we use #docchain
nostr:npub1dld9hn3gsgtkh7atl26s8gd49qfjjkpdw8ztap9mk4n7vhq60y0satfd8s nostr:npub1m6gvtkek5sq3l82cfh7p3hs62ujxs6r8npre8m6jvvcm28utg05sde2e6g nostr:npub1hudtuvkqr970j7s4lgsqf937wjme7khntgt99zdzrsxd05ax3lyqzlvgug nostr:npub19anqt2w7kpq5vmg8ehrkl783mfpcvqg68t2edxdswcp6d8ckfvrqn7ml0w are some more