The goal of grassroots cryptocurrencies is to provide a foundation with which local digital economies can emerge independently of each other and of global digital platforms and global cryptocurrencies; can form and grow without initial capital or external credit; can trade with each other; and can gradually merge into a global digital economy. Grassroots cryptocurrencies turn mutual trust into liquidity and thus could be a powerful means for 'banking the unbanked'. Grassroots cryptocurrencies have not been provided yet with a payment system, which is the goal of this paper. Here, we present Grassroots Flash, a payment system for grassroots cryptocurrencies that employs the blocklace -- a DAG-like counterpart of the blockchain data structure. We analyze its security (safety, liveness, and privacy) and efficiency, prove that it is indeed grassroots.

翻译：草根加密货币的目标是为本地数字经济提供基础，使其能够彼此独立地发展，独立于全球数字平台和全球加密货币；无需初始资本或外部信用即可形成并增长；能够相互交易；并能逐渐融入全球数字经济。草根加密货币将相互信任转化为流动性，因此可能成为“为无银行账户者提供银行服务”的强大工具。草根加密货币尚未配备支付系统，这正是本文的目标。在此，我们提出草根闪电（Grassroots Flash），一种采用区块花边（blocklace）——一种类似于有向无环图（DAG）的区块链数据结构——的草根加密货币支付系统。我们分析了其安全性（安全性、活性和隐私性）及效率，并证明它确实是草根本质的。