Validates a relay destination hash: exactly 32 lowercase ASCII hex digits (16-byte RNS truncated hash). Returns null when valid, else an error reason (Rust validate_relay_hash).
null
validate_relay_hash
Validates a relay destination hash: exactly 32 lowercase ASCII hex digits (16-byte RNS truncated hash). Returns
nullwhen valid, else an error reason (Rustvalidate_relay_hash).