code: function( pfnNext )
  		{
  			//
  			//	calculate bits value
  			//
  			calculateBitsValueByRoundIndexWithDeposit
  			(
  				oConn,
  				uRoundIndex,
  				fDepositBalance,
  				( err, uSelfBits ) =>
  				{
  					if ( err )
  					{
  						return pfnCallback( err );
  					}
  
  					//	...
  					uCurrentBitsValue = uSelfBits;
  					return pfnNext();
  				}
  			);
  		}
docs: function( pfnNext ) { // //	round (N) //	calculate bits value // _round.getDifficultydByRoundIndex( oConn, uRoundIndex, function( nBits ) { nCurrentBitsValue	= nBits; return pfnNext(); }); },