According to the Zerolink specification, Wasabi was the first and only implementation (https://github.com/nostr:npub1qqvf96d53dps6l3hcfc9rlmm7s2vh3f20ay0g5wc2aqfeeurnh0q580c3j/ZeroLink). This was due to nostr:npub1qqvf96d53dps6l3hcfc9rlmm7s2vh3f20ay0g5wc2aqfeeurnh0q580c3j's design choice of registering a change address during input registration, whereas the Samourai team opted to move the change registration to the Tx0 transaction.

@SamouraiDev did make a valuable contribution to the Zerolink specs by fixing many typos in the original document (https://github.com/nostr:npub1qqvf96d53dps6l3hcfc9rlmm7s2vh3f20ay0g5wc2aqfeeurnh0q580c3j/ZeroLink/commits?author=SamouraiDev). But after that, the Samourai team decided to fork the repo, rename it as "Zeroleak," and then quickly realized it would be much easier to just steal the credit for @nostr:npub1qqvf96d53dps6l3hcfc9rlmm7s2vh3f20ay0g5wc2aqfeeurnh0q580c3j's work by claiming that Samourai was the real Zerolink all along.