Top upcoming proposals

[MadGamer]

It's starting to get hard to keep an eye with all the proposals and improvements being developed currently.

Aside from the lightning network and Atomic swaps, I'm not sure how active the development is for other proposals such as MimbleWimble, TumbleBit, Schnorr Signatures, Confidential transactions, and others.

If possible, could anyone experience tell share what is the estimated time to see these things live on bitcoin? (whether It's a beta or stable release)

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[Pmalek]

Grin is a blockchain and a cryptocurrency focused on privacy and scalability. Grin is also an implementation of the MimbleWimble transaction format with the extensions required for a complete blockchain.

http://grin-tech.org/

They have released their 4th testnet hoping that is the last one before the Mainnet is launched.
https://www.grin-forum.org/t/grin-testnet-4-launch-announcement/993


Regarding TumbleBit I managed to find this info below.

TumbleBit Successfully Integrated Into Breeze
https://stratisplatform.com/2017/08/10/bitcoin-privacy-tumblebit-integrated-into-breeze/

And the newest announcement:
Breeze with Privacy Protocol Mainnet Release
https://stratisplatform.com/2018/08/01/breeze-with-privacy-protocol-mainnet-release/


Regarding Schnorr Signatures I was only able to find out that they are far from being integrated into Bitcoin and need further testing and examining.
https://cryptovest.com/features/schnorr-signature-the-next-step-in-bitcoin-evolution-and-why-is-it-so-important/

Apparently one project that is researching Schnorr Signatures is called Elements Project

Schnorr Signatures are currently being researched and are not enabled within Elements at present.

https://elementsproject.org/features#schnorr

[ABCbits]

1. MimbleWimble is actively developed, but not for Bitcoin. It lacks support from Bitcoin community, mainly because it's not popular and not compatible with bitcoin script
2. TumbleBit already available today on Breeze Wallet
3. Schnorr Signatures is actively developed, but it took long time since there's no standard for it
4. Confidential Transactions won't coming to Bitcoin since it has scalability trade-off (bigger transaction size and longer verification time). Most privacy-based cryptocurrency use it though

Also, there are few upcoming proposal which are interesting

• Dandelion
• MAST
• Eltoo
• Bulletproof (useless unless CT is used as well)

Edit : looks like Pmalek already answer your question while i verify my memory

[cellard]

1. MimbleWimble is actively developed, but not for Bitcoin. It lacks support from Bitcoin community, mainly because it's not popular and not compatible with bitcoin script
2. TumbleBit already available today on Breeze Wallet
3. Schnorr Signatures is actively developed, but it took long time since there's no standard for it
4. Confidential Transactions won't coming to Bitcoin since it has scalability trade-off (bigger transaction size and longer verification time). Most privacy-based cryptocurrency use it though

Also, there are few upcoming proposal which are interesting

• Dandelion
• MAST
• Eltoo
• Bulletproof (useless unless CT is used as well)

Edit : looks like Pmalek already answer your question while i verify my memory

I remember reading that Bulletproof proposal solved the block space cluttering by bigger CT transactions. Peter Wuile said on reddit that he was working on it and tests look good but is far too premature to add in Bitcoin.

I think the nearest around the corner addition will be Schnorr sigs. Apparently it should be easier to add than segwit so no miners drama.

You can also look for the most "crazy" stuff (requires a hardfork) in here: https://bitcoinhardforkresearch.github.io/