Acts 3:19 v Acts 2:38- Forgiveness/Remission/Blotting of sins

[vooks]

Acts 3:19 (KJV)
Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord;

Acts 2:38 (KJV)
Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.

'Your sins may be blotted out'
'Remission of your sins'

Somebody reckons that blotting out of sins is INSTANT. Another insists it is a FUTIRISTIC event.

Questions
1. Do forgiveness/remission/blotting of sins mean the same thing?
2. If they don't, what does each term mean?
3. When do forgiveness/remission/blotting happens,INSTANTLY or in FUTURE?
4. How do I know that my sins are forgiven/remitted/blotted?

 

[vooks]

And as the typical cleansing of the earthly was accomplished by the removal of the sins by which it had been polluted, so the actual cleansing of the heavenly is to be accomplished by
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the removal, or blotting out, of the sins which are there recorded. But before this can be accomplished, there must be an examination of the books of record to determine who, through repentance of sin and faith in Christ, are entitled to the benefits of His atonement. The cleansing of the sanctuary therefore involves a work of investigation--a work of judgment.

At the time appointed for the judgment--the close of the 2300 days, in 1844--began the work of investigation and blotting out of sins.

According to this source, blotting out ALL the sins of the world began in 1844. But this is actually removing of the RECORDS of sin.