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• W2996947162 abstract "Blockchain has gained a lot of attention from both academia and industry. However, traditional standard blockchains, such as Bitcoin and Ethereum, suffer from low throughput, high computation overhead, and large transaction fee, which is not suitable for Internet of Things (IoT) transactions. Recently, transaction-based approaches, such as Tangle structure which is based on a directed acyclic graph (DAG), have emerged to solve blockchain scalability issues for IoT environment. In transaction-based blockchain, for a transaction, namely, a node, to be attached to the Tangle, it needs to verify two other transactions. However, with the Tangle expanding, this attaching process consumes huge computational resources and energy, which severely limits the performance of the transaction-based blockchain. In this article, we present Re-Tangle, a highly parallelized processing-in-memory (PIM)-based accelerator for transaction-based blockchain. Re-Tangle is composed of a random walking module, a transaction validation module, and a PoW module, to improve the Tangle system performance. These modules transfer Tangle functions, such as fast exponentiation and modular, into ReRAM-based logic analog computation units. In the random walking module, Re-Tangle maintains an exponentiation table to reduce its design complexity and improve its computation efficiency. In the transaction validation module, Re-Tangle further proposes a highly parallel modular unit to accelerate the validation of different tags in a transaction. In the PoW module, we decompose the Curl hash function into basic logic OR, AND, SHIFT, and XOR operations, and map these logic operations to ReRAM crossbars in parallel to accelerate the working process. The experimental results show that Re-Tangle distinguishes itself from other architectures with significant performance improvement and energy saving. The throughput of Re-Tangle is about $22.4times $ and $2.38times $ higher compared with CPU and GPU, respectively, and the energy consumption of Re-Tangle is $83.5times $ and $5.77times $ less for equal workload." @default.
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• W2996947162 date "2020-05-01" @default.
• W2996947162 modified "2023-10-17" @default.
• W2996947162 title "A Highly Parallelized PIM-Based Accelerator for Transaction-Based Blockchain in IoT Environment" @default.
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• W2996947162 doi "https://doi.org/10.1109/jiot.2019.2963245" @default.
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