# GRIN Papyrus - a collection of important GRIN documents since Day-0

**URL:** <https://forum.grin.mw/t/grin-papyrus-a-collection-of-important-grin-documents-since-day-0/7053>\
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**Created:** [February 12, 2020, 1:05pm UTC](https://forum.grin.mw/t/grin-papyrus-a-collection-of-important-grin-documents-since-day-0/7053 "2020-02-12T13:05:01Z")\
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**Author:** ![tromp](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.grin.mw/tromp/32/22_2.png) [@tromp](https://forum.grin.mw/u/tromp)\
**Post date:** [February 14, 2020, 4:32pm UTC](https://forum.grin.mw/t/grin-papyrus-a-collection-of-important-grin-documents-since-day-0/7053/7 "2020-02-14T16:32:28Z")

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> [@mcm-mike](#):
>
> - IRC logs from 02.Aug.2016; the first appearance of Tom who submitted the first MW documents

Regarding the remark

> [@](#):
>
> Later, Shen Noether combined the two approaches to obtain “confidential transactions” of Maxwell AND the darkening of van Saberhagen [4].

from mimblewimble.txt, note that where Maxwell wanted the transaction excess to be an unblinded zero:

> [@](#):
>
> If the author of a transaction takes care in picking their blinding factors so that they add up correctly

Noether required it to not to be:

> [@](#):
>
> This is undesirable, since it removes the anonymity provided by the ring signatures.

And it’s easy to see how Jedusor was inspired by Noether’s

> [@](#):
>
> Thus, the above summation becomes a commitment to 0, with sk =  
> z, and pk = zG, rather than an actual equation summing to zero.

In Monero’s RingCT, the recipient blinding factor and hence this excess, is determined by the sender, while use of Diffie-Helmann allows for secure sharing with the receiver.

Jedusor’s insight was to instead let the receiver pick their own blinding factor, making the excess a 2-of-2 multiparty key shared by sender and receiver.

[4] [https://eprint.iacr.org/2015/1098.pdf](https://eprint.iacr.org/2015/1098.pdf) Shen Noether, Ring Confidential Transactions

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