Please have a look at https://bouquet.slidestr.net/ build by nostr:npub1klr0dy2ul2dx9llk58czvpx73rprcmrvd5dc7ck8esg8f8es06qs427gxc 

There I'm able to connect to multiple Blossom mediaserver and transfer blobs between them. So my blobs can live on multiple mediaserver with the same identifier all signed by my keys. 

https://shares.sebastix.dev/BeHMfw6D.png