# Sourced Labels Besides publicly available data sources, ChainArgos also tracks social media, news reports, police investigations, national security bulletins, OFAC sanctions notices, and thousands of other public databases to develop "Sourced Labels." While every effort is made to verify, crosscheck, and validate "Sourced Labels," blockchain address labeling is an ongoing research effort that is often heavily assisted by grassroots contributions. ### Conviction Level of a Label Occasionally, a "Label" where a higher level of precision may be lacking, will be marked with question marks. A single question mark indicates that there are some doubts as to the precision of the address "Label." ``` ? ``` More speculative address "Labels" are indicated by a series of three question marks. ``` ??? ``` Blockchain address labeling is not a precise science, and where ChainArgos marks Labels with question marks, such Labels ought to be treated with a degree of caution, and attempts to independently crosscheck and verify such Labels should be made by users. ### Label Corrections If you notice an incorrectly labelled wallet or smart contract address, please notify ChainArgos at: and we will investigate the matter further. ### Contribute to our Database If you would like to provide wallet and/or smart contract tags, to contribute to the existing database, please email us at: your contribution could help to prevent the next illicit transaction. Thank you for your help. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.chainargos.com/documentation/labels/sourced-labels.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.