Scams -- fraudulent schemes designed to swindle money from victims -- have existed for as long as recorded history. However, the Internet's combination of low communication cost, global reach, and functional anonymity has allowed scam volumes to reach new heights. Designing effective interventions requires first understanding the context: how scammers reach potential victims, the earnings they make, and any potential bottlenecks for durable interventions. In this short paper, we focus on these questions in the context of cryptocurrency giveaway scams, where victims are tricked into irreversibly transferring funds to scammers under the pretense of even greater returns. Combining data from Twitter, YouTube and Twitch livestreams, landing pages, and cryptocurrency blockchains, we measure how giveaway scams operate at scale. We find that 1 in 1000 scam tweets, and 4 in 100,000 livestream views, net a victim, and that scammers managed to extract nearly \$4.62 million from just hundreds of victims during our measurement window.

翻译：诈骗——旨在骗取受害者钱财的欺诈手段——有史以来便存在。然而，互联网的通信成本低、覆盖范围广且具备功能性匿名性，使得诈骗规模达到空前高度。设计有效干预措施需首先理解背景：诈骗者如何接触潜在受害者、获取的收益，以及持久干预的潜在瓶颈。在本文短文中，我们聚焦于加密货币赠品诈骗背景下的这些问题——此类诈骗通过承诺更高回报诱骗受害者不可逆地转账资金。通过整合Twitter、YouTube、Twitch直播、登录页面及加密货币区块链的数据，我们测量了赠品诈骗的大规模运作方式。研究发现，每1000条诈骗推文和每10万次直播观看中，分别有1次和4次导致受害者上钩；在我们的测量窗口期内，诈骗者仅从数百名受害者手中就骗取了近462万美元。