We really appreciate your interest in enhancing funding data!
In terms of directly updating or amending publication records, the gist is that there needs to be a single entity (typically the publisher) that’s responsible for stewarding and persistently maintaining a given record. And we don’t have plans to fundamentally change that model.
However, we have identified community-sourced metadata corrections/assertions on our roadmap as something we’d like to implement in the future. That project is planned to initially focus on identifying retractions, but community-sourced updates to other types of metadata, including funding data, would be a natural outgrowth of that project. Publishers would still need to approve each suggested update, though.
And, all that said, there is a way to link a publication to a funder from the funder side. If the funder in question joins Crossref as a funder member, and registers Grant DOIs, they can assert a relationship in the Grant’s metadata indicating that a particular publication was based on research funded by that grant.
For instance, if you look at this example Grant deposit, the relationship metadata looks like this:
<description>article funded by grant</description>
<inter_work_relation identifier-type="doi" relationship-type="continues">10.5555/letsgogrants03b</inter_work_relation>
That indicates that the Grant being registered with the metadata deposit (10.32013/vGVkUKI) funded research that resulted in the publication 10.5555/letsgogrants03b. And, relationships are included in Event Data.
Grant DOIs can be registered for awards of time at research facilities, not just for funding.