docs: function(compressed) {
      if (compressed.length != (32 + 1) * 2) {
        throw new Error('Wrong length');
      }
  
      var prefix = compressed.slice(0, 2);
      var x = compressed.slice(2);
  
      if (prefix === '02') {
        var y = this.getYbyX(x, true);
      }
      else if (prefix === '03') {
        var y = this.getYbyX(x, false);
      }
      else {
        throw new Error('Incorrect prefix');
      }
  
      return {x: x, y: y};
    }