This is the first domain in the .CH TLD protected with Ed25519 (Algorithm 15) DNSSEC signatures, generated by a PowerDNS Authoritative Server
More information about Ed25519 can be found here
Test if your resolver validates Ed25519 signatures using the rootcanary algorithm test
DNSviz result for ed25519.ch
Verisign Labs DNSSEC debugger result for ed25519.ch
The first Ed448 (Algorithm 16) signed .ch domain is ed448.ch