lib/BlockCypher/Api/MicroTX.php
public function sign($hexPrivateKey)
    {
        $this->setSignatures(Signer::signMultiple($this->tosign, $hexPrivateKey));
        return $this;
    }
public function sign($hexPrivateKey)
    {
        $this->setSignatures(Signer::signMultiple($this->tosign, $hexPrivateKey));
        return $this;
    }
public function sign ( $ hexPrivateKey ) { $ this -> setSignatures ( Signer :: signMultiple ( $ this -> tosign , $ hexPrivateKey ) ) ; return $ this ; }
Signs MicroTX.

@param string[]|string $hexPrivateKey
@return $this
@throws \Exception
Signs MicroTX .