this derivation will be built:
  /nix/store/2fyakm4x9wj1g5hrvcdjazn8dais59rp-ouroboros.drv
building '/nix/store/2fyakm4x9wj1g5hrvcdjazn8dais59rp-ouroboros.drv' on 'ssh-ng://nixbuild@stibnite-builder'
building '/nix/store/2fyakm4x9wj1g5hrvcdjazn8dais59rp-ouroboros.drv'
ouroboros> structuredAttrs is enabled

upload niks3: ok