Is there a way to put content behind a paywall on nostr? I'm no fan of paywalls, but specifiable rates could entice more businesses and artists to use nostr. Imagine putting a hashtag on some notes that specify that it can only move across a relay if a payment is made - that would allow artists to post like normal but also put their paid content in followers' feeds, while not bothering people who follow but don't subscribe. I remember how Twitter was really pushed by businesses on their old platforms before most casual twitter people started using it. Same effect could happen here. But if Twitter becomes a blue wechat first, the opportunity will be missed.  

 This might already be a thing. If not, nostr needs it.

nostr:nevent1qqsv9myr0hnfs4lw7f0gf4tmjcpnx8rzg4r6xwxc4v3trdv7l3hm92qpzpmhxue69uhkummnw3ezumt0d5hsygz474emv5007dgak4asvqwjxq3d33fjlxp9mvg22ue7huumuj4zrvpsgqqqqqqs549u73 

 The only serious attempt I’ve seen is https://creatr.nostr.wine . I am not in favor of using paywalls this way, however, so I cannot speak to how effective it has been as I have not tried it. I think @𝕾𝖊𝖗 𝕾𝖑𝖊𝖊𝖕𝖞 tried it at one time. Maybe he has some insight.