All data available on this website comes from the Mexican Justice System and the INEGI. If you use the data I would appreciate a link back. Some states may be missing from the municipio data because they haven't reported their data, if this happens wait a couple of days and download the data again.
Every month, around the 20th
It's usually updated at the end of the year and preliminary data is available around July, but there is no set date to release the data
The rates shown on this website are annualized (multiplied by 12) and use 30 day months, so you have to divide the homicide numbers by the number of days in the month and then multiply by 30
No, it's completly independent
You can send your Bitcoins to 1D9o9JeZbsWvHhQMnhphab85i97S5e24Pj