If it helps here's the little js function I use to count the bits of work for the webui at https://powrelay.xyz

function zeroLeadingBitsCount(hex32) {

let count = 0;

for (let i = 0; i < 64; i += 2) {

const hexbyte = hex32.slice(i, i + 2); // grab next byte

if (hexbyte == '00') {

count += 8;

continue;

}

// reached non-zero byte; count number of 0 bits in hexbyte

const bits = parseInt(hexbyte, 16).toString(2).padStart(8, '0');

for (let b = 0; b < 8; b++) {

if (bits[b] == '1' ) {

break; // reached non-zero bit; stop

}

count += 1;

}

break;

}

return count;

};

You could add this to your site and have some code that only shows posts with more than some number. Then you'll need to add a function to let users generate pow locally on their browsers.