TLD

Top Level Domains (TLDs) are required to resolve domain names.

The .sol TLD is

export const SOL_TLD_AUTHORITY = new PublicKey(
  "58PwtjSDuFHuUkYjH9BYnnQKHfwo9reZhC2zMJv9JPkx"
);

The .sol TLD is owned by the root TLD

export const ROOT_TLD_AUTHORITY = new PublicKey(
  "ZoAhWEqTVqHVqupYmEanDobY7dee5YKbQox9BNASZzU"
);

All .sol domains are subdomains of the .sol TLD