Learn Spanish (Latin America): Míralo; no es el lienzo original, que me conste. - Look at it; it is not the original canvas, as far as I know for certain.

While both are subjunctive phrases used to limit a statement, que yo sepa just means as far as I know. que me conste is stronger, translating closer to as far as I know for certain or that I have proof of. The verb constar implies having concrete evidence or personal certainty.

Why do we use the indirect object pronoun me in que me conste instead of just saying que yo conste?

The verb constar works similarly to gustar. The person who knows or is certain is the indirect object (me), and the fact being known is the subject. Literally, the phrase means something like that it is evident to me.

Does the word lienzo refer to the artwork or the fabric?

lienzo specifically refers to the physical canvas material or linen used for painting. While you might often hear cuadro or pintura for the artwork itself, lienzo emphasizes the actual fabric surface, which makes perfect sense when debating if it is the original physical piece.

Why does Míralo require a written accent mark?