In a small bowl, gently fold the rice vinegar and sea salt into the warm cooked sushi rice until well combined.
Place a nori sheet on a bamboo sushi rolling mat and spread half of the rice in a thin, even layer, leaving one inch at the top edge clear.
Slice the sushi-grade salmon, avocado, and cucumber into thin, uniform strips.
Arrange half of the salmon, avocado, cucumber, and hemp seeds in a horizontal line across the center of the rice.
Using the bamboo mat, roll the nori tightly over the fillings, applying gentle pressure to create a firm cylinder.
Moisten the top edge of the nori with a drop of water to seal the roll completely.
Repeat the process with the second nori sheet and the remaining ingredients.
Use a very sharp knife to slice each roll into 6 to 8 pieces and sprinkle with toasted sesame seeds.
Serve immediately with coconut aminos for dipping.