Function isHex

isHex(value: unknown, length: number): value is string
Whether value is a lowercase hex string of exactly length characters.
Parameters
- value: unknown
  Candidate.
- length: number
  Expected length (64 for keys and ids).
Returns value is string
Type guard result.
Example
```
isHex(MOCK_ACCOUNTS[0].pubkey, 64) === true;
```
- Defined in packages/mocks/src/domains/nostr-store.ts:212