'nailed to the cross'

What was 'Nailed to the Cross'? What about the 613 Mitzvot?

Some claim that the law of God, including the Ten Commandments were "nailed to the cross" or nailed to the stauros/stake as the Greek teaches. What was the certificate of debt or handwriting of requirements that was done away with for those who truly repent and accept Jesus? What about the Sabbath and the Holy Days? What did early Christians do? What are the 613 Mitzvot? Do these correspond with the number of seeds in a pomegranates? Were there multiple parts to the 'Law of Moses'? …