t (20) → q (17) t → q b (2) → y (25) y (25) → v (22) q (17) → n (14) → — no.

Given common puzzles, “ttbyq msaryf mhkr” ROT13 gives . If I try ROT13 on “ggold” back to “ttbyq” — yes, so original is ciphertext, “ggold” is plain. But “zfnels” isn’t a word. Could be a name or another cipher inside.

t (20) → g (7) t → g b (2) → o (15) y (25) → l (12) q (17) → d (4) So "ttbyq" →

Reverse "ttbyq" → "qy btt" → apply ROT13: q (17) → d, y (25) → l, space stays, b (2) → o, t (20) → g, t (20) → g → ? No.

Given the simplicity, , producing ggold zfnels zuxe — possibly a name (Gold? Zfnels? Zuxe?). But perhaps “zfnels” is meant to be “sfinels” → “spinels” (gemstone) if we fix typos.