True if s is a lowercase sha3-256 hash (64 hex chars, no 0x).
s
isHashHex('be5c7feb45e2c2faa9cb69c97ae42f75a9e9a15fcfdf65e2999b43df91f91d0a') // true Copy
isHashHex('be5c7feb45e2c2faa9cb69c97ae42f75a9e9a15fcfdf65e2999b43df91f91d0a') // true
True if
sis a lowercase sha3-256 hash (64 hex chars, no 0x).