It's actually more than that.....
Specifically - Blaspheming the Spirit is KNOWING that work is By the Spirit, and THEN attributing it otherwise.....
The key here is that you HAVE to KNOW it's the Spirit..... This means that you unequivocally have the ABILITY to Perceive the work of the Spirit.... This means you have to be "Fathered from Above" - Ref John 3.... This means.. Either "Born Again" with the Holy Spirit at work - or some sort of Demonic/Satanic force is involved.... Principalities and Powers....
This is different than being Blind or deceived.... Remember - Jesus says this sin is 100% unforgivable.. EVER... This means that JESUS DID NOT DIE for THIS Sin.... Which group falls outside of "Whosoever calls upon Him will be saved" - this takes us back to "Principalities and Powers".... Spiritual forces... Not simply men being foolish or envious or prideful....
In the case you are mentioning, the Temple Leadership sent a group of "Hit men" out to Besmirch and Scandalize Jesus.....
Prior to this - the temple leadership had in fact TESTIFIED that the works Jesus performed were FROM GOD......
The Temple Leadership knew full well what they were doing... The men they sent may not have - likely, they were deceived by their leadership - and in fact, many of those men were later saved....
Let's not forget, though, that this is a serious matter.... In questions of the Holy Spirit at work - we need to take full effect of all Discernment, testing of Fruit, checking Messages.. ESPECIALLY because of the prevalence of Deception by our Enemy... who would like to call ALL work of the Spirit not so..... if all else fails and you cannot be sure either way because you are not there in person... Sometimes the best thing to do is to hold your tongue.....
Thanks