What tools are available to analyze the bitcoin blockchain?
I know Chainanalysis.com runs a service, but I'm not sure they would even want to help.
Are there any open source tools? Or any tools?
I think
MistTrack could be helpful for you. To give you a better sense of the kind of information this service provides, I’ve included the transaction graph for address bc1qykh0vep5a567x8yhlrq0yefhyyteg5sv7dejd2 below. As you can see, it shows the transaction amounts, data, destination and source addresses, and even some doxing information on destination addresses. The best part
is of this info it’s all free.