Abstract: Methods and systems are described herein for a decision layer of a multi-layer data platform. The decision layer may process application queries and serve the queries based on a dataset of previously generated and indexed data or, as a last resort, queries the blockchain node directly. Using indexed blockchain data to serve application queries reduces latency and downtime of traditional systems that direct queries to blockchain nodes immediately. Furthermore, the decision layer overcomes high latency and downtime issues associated with a pool of load-balanced nodes by reducing the number of direct queries to a blockchain. When applications rely on data directly queried from a blockchain, they are susceptible to limited availability, a problem that the decision layer mitigates with indexed and updated blockchain data.

Abstract: A smoking tool includes a pipe body, a holder and a control valve. The pipe body has a top opening, a bottom wall, and a smoke storage chamber for containing a filtering agent. The holder, which is detachably supported at the pipe body, includes a cup for holding a predetermined amount of herb scraps such as tobacco to be burnt therein. The control valve is operatively provided at a bottom portion of the pipe body for discharging the filtering agent from the smoke storage chamber in a controlling manner, wherein when the control valve is opened for discharging the filtering agent from the smoke storage chamber to create a suction effect therewithin at the same time that the herb scraps is burnt to generate smoke, the smoke is sucked into the smoke storage chamber through the smoke guiding tube and is filtered by the filtering agent.