[bitcoin-dev] [Bitcoin Advent Calendar] Payment Pools/ Coin Pools

[Jeremy via bitcoin-dev]

This post showcases building payment pools / coin pools* in Sapio!

https://rubin.io/bitcoin/2021/12/10/advent-13/

There will be many more posts in the series that will take this concept a
lot further and showcase some more advanced things that can be built.

I think that payment pools are incredibly exciting -- we know that it's
going to be tough to give every human a UTXO, even with Lightning. Payment
Pools promise to help compress that chain load into single utxos so that
users can be perfectly secure with a proof root and just need to do some
transactions to recover their coins. While channels could live inside of
payment pools, scaling via payment pools without nested channels can be
nice because there is no degradation of assumptions for the coins inside
being able to broadcast transactions quickly.

Payment pools in Sapio also provide a natural evolution path for things
like Rollups (they're essentially federated rollups with unilateral exits),
where state transitions in pools could one day be enforced by either
covenants or some sort of ZK system in place of N-of-N signatures.

Hopefully this stimulates some folks to muck around with Sapio and
experiment creating their own custom Payment Pools! I'd love to see someone
hack some kind of EVM into the state transition function of a payment pool
;)

Cheers,

Jeremy

* we should probably nail down some terminology -- I think Payment Pools /
Coin Pools are kinda "generic" names for the technique, but we should give
specific protocols more specific names like payment channels : lightning
network.

--
@JeremyRubin 

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[bitcoin-dev] Rebroadcast mechanism in Bitcoin P2P network

[Prayank via bitcoin-dev]

Hello World,

I had started working on this blog dedicated to Hal Finney in August: 
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2021-August/019367.html

I have been able to track more than 10 Issues and Pull Requests from different 
Bitcoin projects that are focused on privacy. Wrote 3 blog posts and will write 
more often as I learn new things. There is a section called 'Hall of Fame' and 
7 developers are listed in hof who worked on one or more pull requests that 
helped improve privacy in Bitcoin projects: Andrew Chow, chimp1984, jmacxx, 
Luke Dashjr, Samuel Dobson, Vasil Dimov and wpaulino.

Last post is about 'Rebroadcast mechanism' used in Bitcoin full node 
implementations: https://prayank23.github.io/camouflage//blog/rebroadcast/

Problem: Rebroadcast mechanism used in Bitcoin Core and Knots, rebroadcasts 
only our transactions. This helps spy nodes to link bitcoin addresses with IP 
addresses and also know that wallets are enabled for a node.

Solution by Amiti Uttarwar: New rebroadcast mechanism in which transactions are 
re-broadcasted based on fee rate and mempool age.

I have shared other details, my opinion and links to comments by Suhas Daftuar 
in the blog post since related pull request has been in draft mode for some 
time now.

-- 
Prayank

A3B1 E430 2298 178F
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