Matter Labs' trademarking of "ZK" caused backlash from Starkware, Polygon, and Polyhedra. After criticism and a public letter, they withdrew their applications. Polyhedra rebranded their token ticker, and Matter Labs continues to focus on zkSync platform developments.

ZK Hyperchains are Layer 3 (L3) blockchains built on top of existing Layer 2 (L2) or Layer 1 (L1) solutions. They leverage the power of zero-knowledge proofs (ZKPs), a cryptographic technique that allows one party (the prover) to prove to another party (the verifier) that a statement is true without revealing any additional information.