Drain the canned tuna thoroughly and flake it into a small bowl using a fork.
Julienne the cucumber, carrots, and red bell pepper into very thin, uniform matchsticks.
In a small mixing bowl, whisk together the peanut butter, coconut aminos, rice vinegar, sesame oil, ground ginger, sriracha, and water until the sauce is completely smooth.
Fill a wide, shallow dish with warm water. Submerge one rice paper sheet for about 5-10 seconds until it begins to soften but is still slightly firm.
Lay the softened rice paper flat on a clean, damp cutting board or plate.
In the center of the paper, layer a portion of the tuna, cucumber, carrots, bell pepper, cilantro, and mint leaves.
Fold the bottom edge of the rice paper over the filling, then fold in the left and right sides.
Roll the paper upward tightly to seal the spring roll, ensuring the vegetables are snug inside.
Repeat the process with the remaining rice paper sheets and filling ingredients.
Serve the fresh spring rolls immediately with the peanut dipping sauce on the side.