请出示证件身份是暗影狂奔者非常重视的东西——尤其是牵扯到他们的真实身份时。由于现代矩阵以及数据存储和数据挖掘方面的进步，只要你知道自己要做什么，就可以很轻易地通过姓名、SIN、信用转移甚至通讯链的物理运动轨迹来追踪人们。大多数暗影狂奔者重视他们的隐私，他们往往将匿名性发挥到极致。
SIN里有什么？UCAS在2036年引入了系统识别编码(SINs)，要求每个UCAS公民进行注册。居住在UCAS没有SIN的个人被认为是“试用期公民”，这意味着他们没有投票权，几乎不享有公民权利。现在，SIN是在人们出生时合法登记的——假设出生过程是被合法登记的。许多分娩仍发生在正常渠道之外，特别是在贫穷或荒野的地区。
并不是世界上每个国家都使用SIN——大多数都在使用，但他们可能会使用不同的名称(出于游戏目的，我们使用SIN作为默认术语)。GSINR(全球SIN登记处，一个由企业法庭全额资助的项目)是一个监管机构，它为SIN的使用和分配以及与之相关的数据设定了全球标准。根据公司法，享有治外法权的企业必须遵守这些协议，发布企业SIN以登记与追踪其员工/公民。国家和企业SIN中心必须与GSINR共享其数据，但除此之外，它们将仅向执法部门和其他合适机构提供保密数据。虽然很少见，但双重国籍(如UCAS/Ares)是可能的；在这种情况下，你会有两个不同的SIN。然而，如果你成为另一个国家或企业的公民，一些企业和国家将撤销你的公民身份。
64年的矩阵崩溃毁掉了难以计数的身份记录，导致无SIN人口激增。作为回应，许多政府推出了“SIN特赦计划”，允许无SIN者(重新)登记并且不问任何问题——许多人利用这一点开始了新生活。然而，其他人宁愿他们的过去消失，并抓住机会留在暗影中。事实上，许多人对SIN的使用方式以及他们的生活如何被政府和超企监控和跟踪有着合理的担忧(而非过于理性的偏执)，因此他们宁愿置身于系统之外——或者至少在可能的情况下使用假ID。
在UCAS政府注册并获得SIN是可行的，但要这样做，必须证明他们是可靠，正直的公民，并且UCAS可以通过接收他们获得一些东西。对于蔓城区中大多数无SIN者来说，这不是一个可行的选项。
组成SIN的实际数字是根据多条个人数据通过复杂公式生成的。这意味着执法人员可以从你的SIN中确定你的出生日期，原籍的州或国家，公民身份和姓名缩写。
由于暗影狂奔者是下层社会的居民，所以默认情况下他们是无SIN的，除非他们开始时就拥有注册者的负面特质(第95页)。
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What’s in a SIN?
The UCAS introduced System Identification Numbers (SINs) in 2036, requiring the registration of every UCAS citizen. Individuals residing in the UCAS without a SIN are considered “probationary citizens,” which means they are not allowed to vote and have few to no civil rights. Nowadays, SINs are legally registered at birth—assuming the birth is legally recorded. Many births still happen outside of normal channels—especially in poor or barrens areas.
Not every nation in the world uses SINs—most do, but they may name them differently (for game purposes, however, we use SIN as the default term). The GSINR (the Global SIN Registry, a fully-funded project of the Corporate Court) is the regulatory body that sets the worldwide standards for how SINs are used and assigned—and also what data is correlated with them. Extraterritorial corporations are required to adhere to these protocols by corporate law, issuing corporate SINs to track and register their employees/citizens. National and corporate SIN registries are required to share their data with the GSINR, but otherwise they keep the data confidential, only making it available to law enforcement and other appropriate agencies. Though rare, dual citizenship (such as UCAS/Ares) is possible; in such cases, you would have two separate SINs. Some corporations and nations, however, will revoke your citizenship if you become a citizen of another country or corporation.
The Crash of ’64 destroyed thousands if not millions of identity records, creating a surge in the SINless population. In response, many governments staged “SIN amnesty programs” and allowed the SINless to (re-)register, no questions asked—which many took advantage of to start new lives. Others, however, preferred that their pasts were gone, and took the opportunity to stay in the shadows. The truth is, many people have valid concerns (and not so rational paranoia) about how SINs are used and how their lives are monitored and tracked by governments and megacorps, and so prefer to stay outside of the system— or at least to use a false ID whenever possible.
It is possible to register with the UCAS government and obtain a SIN, but to do so one must prove that they are a solid, upstanding citizen and that the UCAS has something to gain by admitting them. For most SINless members of the sprawl, this is not a viable option.
The actual numbers that compose a SIN are generated by a complex formula from several pieces of personal data. What this means is that law enforcement officials can determine your birthdate, state or country of origin, citizenship, and initials from your SIN.
As shadowrunners are denizens of the underworld, it is assumed that they are SINless by default, unless they start off with the SINner negative quality (p. 95).
如果一个无SIN者被逮捕，可能会发生几件事。无SIN者被可怕地虐待、关押或“失踪”并不罕见，因为他们没有发言权，也没有数据踪迹来证明他们的存在。然而，大多数无SIN的被捕者都会被发给“犯罪者SIN”——他们余生都将身陷其中。之后，犯罪SIN被保存在多个执法数据库中，并与他们的照片、生物指纹、DNA记录和组织样本一起编入索引。
如果你没有SIN，许多普通公民认为理所当然的活动对你来说都是不可能的。例如，你需要SIN来获得一份合法的工作，开银行账户，拥有财产，上学，租公寓，办理公共设施服务等。最重要的是，现在任何形式的合法旅行都需要SIN，包括购买公交车票。即使是那些有犯罪者SIN的人也会发现，在没有繁文缛节和过多麻烦的情况下，同样很难完成许多这些活动。当有SIN者死后，这个SIN就会被贴上标签，以表明它属于一个已死的人，然后它就会失效(或以其他方式保存在档案中)。
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SINLESS CONSEQUENCES
If a SINless person is arrested, several things can happen. It is not uncommon for the SINless to be horribly abused, locked away, or “disappeared,” as they have no rights to speak of and no datatrail to even prove they exist. Most SINless arrestees, however, are issued a “criminal SIN”— which they are then stuck with for the rest of their lives. That SIN is now archived in multiple law-enforcement databases and indexed with their photograph, biometric prints, DNA records, and tissue sample.
If you lack a SIN, many activities that normal citizens take for granted become impossible for you. For example, you need a SIN to get a legal job, open a bank account, own property, go to school, rent an apartment, establish utility services, and so forth. Most importantly, a SIN is now required for any form of legal travel—including just buying a bus ticket. Even those with criminal SINs will find it difficult to perform many of these activities without red tape and hassle. When an individual with a SIN dies, the SIN is tagged to indicate that it belongs to a deceased individual, and is then deactivated (but otherwise kept on file).
