/usr/share/sagemath/ellcurves/rank8 is in sagemath-database-elliptic-curves 0.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | 249649566346838 a 1 [1,-1,0,-106384,13075804] 8 1
292246301470558 a 1 [1,-1,0,-222751,40537273] 8 1
314214346667560 a 1 [0,0,0,-481663,128212738] 8 1
314658846776578 a 1 [1,-1,0,-71899,5522449] 8 1
315734078239402 a 1 [1,-1,0,-124294,14418784] 8 1
457532830151317 a 1 [0,0,1,-23737,960366] 8 1
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