Proof of Working Knowledge (PoWK) is a cryptographic protocol developed by Black Catus that allows one party to confirm the authenticity of a coin or token to another without revealing any additional information. PoWK supports data verification while preserving confidentiality, thereby improving security and protecting against malicious threats. The Spacetime feature guarantees that a specific area of the network remains unchanged for a predetermined period. According to the developers of PoWK, the cost of storage is linked to both the size of the space and the length of time it is utilized.