dnssec Presigned
If true, allows Cloudflare to transfer in a DNSSEC-signed zone including signatures from an external provider, without requiring Cloudflare to sign any records on the fly. Note that this feature has some limitations. See [Cloudflare as
Secondary](https://developers.cloudflare.com/dns/zone-setups/zone-transfers/cloudflare-as-secondary/setup/#dnssec) for details.