Abstract: Methods of producing solid CO2 sequestering carbonate materials are provided. Aspects of the methods include introducing a divalent cation source into a flowing aqueous liquid (e.g., a bicarbonate rich product containing liquid) under conditions sufficient such that a non-slurry solid phase CO2 sequestering carbonate material is produced. Also provided are systems configured for carrying out the methods.

Abstract: Blockchain-based systems and methods for providing secure digital identities and affiliations for users via digital tokens. A set of digital tokens are generated that are sharable on a distributed computer network. The set of digital tokens are affiliated with an entity or a person. One or more of the digital tokens are provided to one or more users of the distributed computer network, where the one or more users comprise at least a first user, and where the first user is provided a first token selected from the one or more of the digital tokens. The first user is identified as affiliated with the entity or the person based on a receipt of an indication that the first user is associated with the first token.

Abstract: A modular helmet interface with a mounting cleat and adhesive layer is provided. In one aspect, a mounting cleat is affixed to a helmet, such as a ballistic helmet, by an adhesive layer, the mounting cleat having a cavity filled with the adhesive used to secure the cleat to the helmet. In a further aspect, the mounting cleat has one or more annular grooves for improving the bond between the cleat and the helmet. In another aspect, a mounting cleat is secured to a helmet by way of a cleat-receiving securing member, the securing member affixed to the helmet by an adhesive layer.