Hello all, I am currently implementing a script to remotely register dark data (files present on a storage element, but not registered on the DFC). I am using the `registerFile` method of the `DataManager`, and have access to the files Adler32 checksums, but since they (generally) do not yet exist in the DFC, I do not know how to generate the GUID as it is done in the DIRAC source, i.e. from the md5 checksum. The SE in question does not support dynamic checksum calculation. Is the GUID important at all? It seems like I am able to register files with a GUID of 'None'. There seems to be a method to generate the GUID from the Adler32 sum, but those look kinda "degenerate" with lots of zeroes in them. Cheers Lukas -- Lukas KOCH Particle Physics Department STFC Rutherford Appleton Laboratory Mail: lukas.koch@stfc.ac.uk Tel: +44 (0) 1235 44 x6265