My general fan theories market, a little arbitrage possibility: 

https://manifold.markets/Tasty_Y/which-song-of-ice-and-fire-fan-theo

Great market, though I try to avoid investing too much in things that won't resolve in my lifetime.

https://youtu.be/T-j01uhSdGo?si=Ric9KT7-ZECKsD7X

If character A (e.g., a maester) wrote the letter on behalf of character B, the market will resolve to character B.

If multiple characters were involved, the market will resolve equally to each of them.

Only an answer from George R. R. Martin will count.

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