Topic reminder:
Some claim being made righteous by the blood of Christ is the same thing as being declared righteous or having righteousness "imputed" to us. This assertion is false theology.
When God and God alone transfers us into Christ, i.e. when we are baptized into Christ, we undergo the circumcision of Christ where our sin burden (what God holds against us due to sin) is removed. Thus the Lamb of God takes away the sin of the world, one sinner at a time.
Additionally, some claim we have not been made righteous, because we still think and do sinful things. This assertion is also false theology. Although we certainly think and do sinful things, because we have been justified, once for all our sins, past, present and future, it is just as if we had not sinned, therefore we remain righteous.
Some English translations of scripture render
Titus 3:7 as including "declared righteous" but the vast majority of translations render the Greek word "dikaiOthentes" as "justified. So a Greek word has within its range of meanings "declared righteous" but according modern translations (NASB, NKJV, NET, LEB and NIV) they all render it justified at
Titus 3:7.
Summary, how are we made righteous, by the blood of the Lamb.
When are we made righteous, when we are transferred into Christ.