Transcript, spoken by interpreter: "Hi. I am DeafBlind. I sign like this"
A note from their interpreter
I told them about the note on their original anonymous ask to @this-is-linguicism that said their form of sign is interesting. They wanted to share how their signing works if this blog ( @share-your-language ) was ever made and it was. They aren't used to signing in front of a camera, hence the stutter in their signs. They were originally going to sign the alphabet and numbers 1 through 10, but they were anxious and this was our best attempt.
A brief explanation of how their signing works
Each finger is assigned a number. 1 through 5 from thumb to pinky, then 6 for closed fist and 7 for open hand. Letters are assigned one to two fingers on one or both hands. For example, "Hi" is signed [both hands: 2+3, right hand: 2+3], which is simply the letters "H" and "I" one after the other. Most words are shortened to their quickest forms. "DeafBlind" is signed [left hand: 2, both hands: 1] which is simply "D+B", and "sign" is signed [left hand: 5, both hands: 6] for "S+N".
To respond to them, I or another person will have them lift their hands to chest height, then squeeze the fingers for the corresponding letters. If I were to tell them "Hi", I would lift their hands, then squeeze the index and middle finger of both hands, followed by squeezing the same fingers on their right hand.
I hope this was informative! This is a throwaway account, simply because my main account is not heavily associated with my interpreting work and because my client can't use the internet independently.