Is there an existing implementation of NIP 29 roles or is it just dead spec? nostr:nprofile1qyv8wumn8ghj7umsv96xjcfdv9exxctwvyhxxmmd9uq35amnwvaz7tms09exzmtfvshxv6tpw34xze3wvdhk6tcpz4mhxue69uhkyctnwdcx...