Can't install the tool - curl: (60) SSL certificate problem: self signed certificate in certificate chain

curl https://dapp.tools/install | sh

gives at the end

copying path '/nix/store/cay94li1m7s8qiigvp6h30l2gf89ys49-cctools-binutils-darwin-949.0.1' from 'https://cache.nixos.org'...
copying path '/nix/store/5kibw14bhhimyikrkh13kxqbc2bbi31l-cctools-binutils-darwin-wrapper-949.0.1' from 'https://cache.nixos.org'...
copying path '/nix/store/8i0yaj3r82kqcdbr453wzzijnszxg4gx-clang-wrapper-7.1.0' from 'https://cache.nixos.org'...
copying path '/nix/store/vbr7ll48szf0cwirl9m0l8dcwl8nqa20-stdenv-darwin' from 'https://cache.nixos.org'...
curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here: https://curl.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
Configured https://dapp.cachix.org binary cache in /Users/dan/.config/nix/nix.conf
error: attribute 'dapp' in selection path 'dapp' not found
All set!

Start by reproducing `curl https://dapp.tools/install | sh` and inspect the installer path that configures the Nix and Cachix binary caches. Compare the SSL failure with the later missing `dapp` attribute error; done means installation completes without the certificate error and the `dapp` command is available.

Written by the indexing model from the issue text.