what are the existing design patterns for electronic signature? I've heard a

Spammy spam, oh so sly,
Filling inboxes, oh my, my.
Clickbait words and tricks they play,
Trying to lead us all astray.

Spammy spam, we’ll delete you,
No more tricks, we see right through.
Unwanted emails, be gone far,
Spammers, you won’t get too far.

Spammy spam, just a bother,
Trying to sell what we don’t want, brother.
We’ll report you, make you flee,
No more spamming, let us be free.

Spammy spam, it’s no game,
We won’t fall for your false claim.
Respect our inbox, hear our plea,
Spammers, now it's time to flee.

Spammy spam, oh so sly,
Filling inboxes, oh my, my.
Clickbait words and tricks they play,
Trying to lead us all astray.

Spammy spam, we’ll delete you,
No more tricks, we see right through.
Unwanted emails, be gone far,
Spammers, you won’t get too far.

Spammy spam, just a bother,
Trying to sell what we don’t want, brother.
We’ll report you, make you flee,
No more spamming, let us be free.

Spammy spam, it’s no game,
We won’t fall for your false claim.
Respect our inbox, hear our plea,
Spammers, now it's time to flee.