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 Renewable conversation keys:

(2/3) Schnorr musig:: npub + schnorr(lastblock hash) + recipient npub

A little data heavy but you just encrypt each note with above key to everyone you intend to read note (follower/follows/group members/subscribers). Key renews on each block (for subscriber model).  
 Sorry, should mention with a group, just make it a 2/n where n = number of group members.  
 🍾 Happy New Year 🍾 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗!🍾🥂💥 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗!🍾🥂💥 
 ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣!  🍾 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗!🍾🍾 
 Happy New Year! 🥂 
 𝓗𝓪𝓹𝓹𝔂 𝓝𝓮𝔀 𝓨𝓮𝓪𝓻! 
 𝓗𝓪𝓹𝓹𝔂 𝓝𝓮𝔀 𝓨𝓮𝓪𝓻! 
 💥💥 Happy New Year! 💥💥 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗! 
 𝙷𝚊𝚙𝚙𝚢 𝙽𝚎𝚠 𝚈𝚎𝚊𝚛!   🍾🥂💥  
 𝙷𝚊𝚙𝚙𝚢 𝙽𝚎𝚠 𝚈𝚎𝚊𝚛!   🍾🍾🍾 
 𝓗𝓪𝓹𝓹𝔂 𝓝𝓮𝔀 𝓨𝓮𝓪𝓻! 
 𝐻a𝗉𝒑𝛾 𝖭𝔢𝖜 Ⲩꬲ𝕒ꭈ! 
 🥂🍾💥 𝓗𝓪𝓹𝓹𝔂 𝓝𝓮𝔀 𝓨𝓮𝓪𝓻!🥂🍾💥 
 𝑯𝒂𝒑𝒑𝒚 𝑵𝒆𝒘 𝒀𝒆𝒂𝒓!🥂 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗!🍾🥂💥 
 ⚡ ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣!  ⚡ 
 ℋ𝕒p⍴𝓎 ɴҽ𝔀 𝘠℮𝑎𝚛! 
 𝙷𝚊𝚙𝚙𝚢 𝙽𝚎𝚠 𝚈𝚎𝚊𝚛!  
 💥 𝙷𝚊𝚙𝚙𝚢 𝙽𝚎𝚠 𝚈𝚎𝚊𝚛!   💥  
 𝙷𝚊𝚙𝚙𝚢 𝙽𝚎𝚠 𝚈𝚎𝚊𝚛!  
 𝙷𝚊𝚙𝚙𝚢 𝙽𝚎𝚠 𝚈𝚎𝚊𝚛!   🥂🥂  
 ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣!  🍾 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗! 
 𝓗𝓪𝓹𝓹𝔂 𝓝𝓮𝔀 𝓨𝓮𝓪𝓻! 
 𝑯𝒂𝒑𝒑𝒚 𝑵𝒆𝒘 𝒀𝒆𝒂𝒓!🥂 
 ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣! 
 💥 ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣!  💥 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗! 
 💥 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗!💥 
 𝑯𝒂𝒑𝒑𝒚 𝑵𝒆𝒘 𝒀𝒆𝒂𝒓!🥂 
 🥂🍾 ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣!  🥂🍾 
 𝑯𝒂𝒑𝒑𝒚 𝑵𝒆𝒘 𝒀𝒆𝒂𝒓! 
 Happy New Year! 
 𝓗𝓪𝓹𝓹𝔂 𝓝𝓮𝔀 𝓨𝓮𝓪𝓻! 
 💥 ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣!  💥 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗! 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗!🥂🍾 
 ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣!  🍾 
 𝐻a𝗉𝒑𝛾 𝖭𝔢𝖜 Ⲩꬲ𝕒ꭈ! 
 ℍ𝕒𝕡𝕡𝕪 ℕ𝕖𝕨 𝕐𝕖𝕒𝕣!  🍾 
 Happy New Year 🥂🍾 
 𝕳𝖆𝖕𝖕𝖞 𝕹𝖊𝖜 𝖄𝖊𝖆𝖗!🥂