A public ID is an identifier a particular service or system makes available or uses to refer to an account, file, person, or other entity. It has no single universal format or meaning: a Cloudinary asset ID, an Opensend account ID, and an XML document property called a public ID are different things. To understand what a public ID does—or whether it is safe to share—you need to know which system issued it.
What does a public ID identify?
An ID is a label or reference for an entity. Depending on the system, that entity might be a media asset, an account, a participant in a study, or a technical object in an XML document. “Public” describes how a particular system uses or exposes the identifier; it does not establish a shared standard across products.
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An identifier is not the same as permission. Knowing an ID may help a service locate an item or target an API request, but access to view or change the item depends on that service’s authorization rules. The word “public” alone does not prove that a value is anonymous, harmless to disclose, or sufficient to access the thing it identifies.
What does “public ID” mean in different systems?
| System or context | What the ID refers to | Where it is used or what to check |
|---|---|---|
| Cloudinary | A digital asset reference used in delivery and transformation URLs. | Cloudinary says IDs may be assigned randomly or selected using filename and custom naming options. See Cloudinary’s upload identification documentation. |
| Opensend | A unique account identifier, primarily used in API requests to specify the target account. | Opensend pairs it with a distinct Private ID. Its help page directs account holders to Account → API Keys. See Opensend’s account ID instructions. |
| Apple Foundation XML | The optional `XMLDTDNode.publicID` property: a public identifier associated with an XML DTD node. | Apple says the property applies to entities and notations. See Apple’s API documentation. |
| Privacy and user discovery | A public contact identifier, such as an email address, may be distinct from a private platform identifier. | The relevant question is whether a system connects or reveals the public identifier alongside private identity or contact information. See the NSF-hosted privacy research. |
| Gorilla research workflows | A Public ID tracks a participant; a randomly generated Private ID is associated with performance data by default. | Check which dataset contains each ID and whether identifying information has been deliberately joined or unblinded. See Gorilla’s participant ID documentation. |
| Telecommunications | Technical standards discuss multiple publicly known user IDs that can represent different social or work roles and preferred ways to reach someone. | The meaning depends on the network, service, and role; this is a technical context, not a universal consumer definition. See the ETSI/3GPP technical report. |
What is a public ID used for?
The specific job depends on the system. Cloudinary uses its Public ID to reference assets and construct delivery or transformation URLs. Opensend uses its account Public ID to identify a target account in API requests. In a research workflow, a participant ID can help track records without using a participant’s name in every data file. These examples are not interchangeable: an ID designed for one service does not automatically identify anything in another.
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Is a public ID the same as a private ID?
No. Some systems distinguish a public-facing or operational reference from a separate private or internal identifier. Opensend documents a Public ID for API account targeting and a Private ID for internal identifier use in secure-environment access configuration. Gorilla documents separate participant-tracking and performance-data roles. Those definitions are specific to their respective services, not a general rule for all IDs.
Privacy depends on how the identifiers and associated data are handled. Research on private user discovery distinguishes a public contact identifier, such as an email address, from a private platform identifier and examines consent and limits on disclosure. Gorilla’s workflow also shows why it matters whether identifying information is joined to study data: linking those records can involve deliberate unblinding. An ID should not be assumed anonymous merely because it is called public or private.
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How do I find the right public ID?
- Identify the system asking for it. Check the product name, screen, API, or support request. The term alone is not enough to identify the expected value.
- Look up that system’s official definition. Confirm which entity the ID identifies and where it is used—such as a profile, API request, URL, or dataset.
- Check whether the system has a separate private or internal ID. Do not substitute one for the other based on the names alone.
- Follow the service’s instructions for locating it. For example, Opensend’s help page points to Account → API Keys for its account IDs.
- Review the sharing and access rules. Treat an ID as potentially identifying or sensitive if it can be connected to an account, person, or private data. Do not send a private ID or secret credential to a field asking for a public ID unless the service’s official instructions explicitly require it.
How to tell what an unfamiliar public ID means
When comparing IDs, establish what entity each identifies, where the value is exposed or used, whether it is stable or changeable, whether it is descriptive or random, whether a private/internal counterpart exists, and what authorization or privacy controls apply. A platform may specify some of these details and leave others unstated; there is no shared implementation rule across the examples above.
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