（九）提供区块链服务的，应当采取监测发现、防范、阻断、处置在区块链上发布、传播违法信息、病毒木马、恶意程序或者为违法犯罪活动提供支付结算等帮助的措施；
第一百三十七条 公安机关应当履行同步录音录像运行安全管理职责，完善技术措施，定期维护设施设备，保障录音录像设备运行连续、稳定、安全。
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1. 选择步长序列（如: n/2, n/4, ..., 1）