CoinJoin: Bitcoin privacy for the real world - page 8.

Carlton Banks

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Quote from: marcus_of_augustus on January 25, 2016, 06:12:12 PM

Quote from: mamadmankan on January 25, 2016, 11:26:26 AM

IMHO, it could be used as a load balancing device for a system with a fixed block size limit. CoinJoins happen automatically to help compress more transactions into the available block space. This could provide a good argument against a scheme with a continuously variable block size, or to a scheme with no limit at all (although I don't think anyone has yet made any serious proposal for the latter). It also illustrates that CoinJoin really is just that, joining inputs and outputs into single transactions, regardless of the utility you're seeking from doing so.

Interesting. What is the effective 'compression' of doing several individual TX versus a single CoinJoin containing the same TXs?

There's a fair proportion of header/data for single output -> pair of outputs, but mamadmankan is only identifying the first steps in the line of thinking that led to stuff like SegWit and Lightning.

marcus_of_augustus

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Eadem mutata resurgo

Quote from: mamadmankan on January 25, 2016, 11:26:26 AM

IMHO, it could be used as a load balancing device for a system with a fixed block size limit. CoinJoins happen automatically to help compress more transactions into the available block space. This could provide a good argument against a scheme with a continuously variable block size, or to a scheme with no limit at all (although I don't think anyone has yet made any serious proposal for the latter). It also illustrates that CoinJoin really is just that, joining inputs and outputs into single transactions, regardless of the utility you're seeking from doing so.

Interesting. What is the effective 'compression' of doing several individual TX versus a single CoinJoin containing the same TXs?

mamadmankan

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IMHO, it could be used as a load balancing device for a system with a fixed block size limit. CoinJoins happen automatically to help compress more transactions into the available block space. This could provide a good argument against a scheme with a continuously variable block size, or to a scheme with no limit at all (although I don't think anyone has yet made any serious proposal for the latter). It also illustrates that CoinJoin really is just that, joining inputs and outputs into single transactions, regardless of the utility you're seeking from doing so.

belcher

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Activity: 261

Merit: 523

The electrum plugin would work by having a sidecar daemon that the plugin sends transaction information to and obtains an unsigned coinjoin transaction. The files are electrum-plugin-daemon.py and electrum-plugin.py, although that branch is probably quite stale.

ABISprotocol

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ABISprotocol on Gist

Quote from: belcher on May 07, 2015, 07:11:26 PM

I'm pleased to announce the mainnet version of JoinMarket.

Expect glitches and a command line interface. But it works.

(...)

I will be working on an Electrum plugin to make it easy to use. Electrum doesn't have a testnet version which is one reason we've moved to the mainnet now.

At this point, do you have an Electrum plugin? If so, where to go to find it?
Am assuming at this point, it's probably here..
https://github.com/JoinMarket-Org/joinmarket/issues/44
and also
https://github.com/JoinMarket-Org/joinmarket/tree/electrum-plugin
If there's a particular file that needs attention/work pls. advise.

ABISprotocol

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ABISprotocol on Gist

Probably nobody will care, but....

1) https://github.com/bitcoin/bitcoin/issues/3226#issuecomment-164755098

2) https://github.com/bitcoin-dot-org/bitcoin.org/pull/1129#issuecomment-155241130

Cheers

bassmaster

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+1 for JoinMarket (and perhaps TailsJoin getting a small percentage as well)

Would love to have gmaxwell take a look at the implementation and provide feedback.

tailsjoin

newbie

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I can't see any reason for why JoinMarket development shouldn't be give some or all of this fund.

dooglus

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Quote from: tommorisonwebdesign on October 30, 2015, 03:24:30 PM

It is definitely an interesting idea. I would definitely like to see am implementation of the concept coded and implemented.

Check out JoinMarket.

It's an implementation of the concept coded and implemented.

tommorisonwebdesign

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It is definitely an interesting idea. I would definitely like to see am implementation of the concept coded and implemented.

phelix

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Quote from: dooglus on October 29, 2015, 12:26:45 PM

Quote from: phelix on October 29, 2015, 12:19:29 PM

Quote from: gmaxwell on August 21, 2013, 09:35:24 PM

The bounty fund will pay out [...] for completed work proposed in this thread that furthers the goal of making improved transaction privacy a practical reality for Bitcoin users.

Would this suite Joinmarket? https://bitcointalksearch.org/topic/ann-joinmarket-coinjoin-that-people-will-actually-use-919116

Was the work proposed in this thread?

I guess only gmaxwell knows the answer to this question. In my eyes Joinmarket is going further than what has been suggested in this thread as it adds the incentive necessary for CoinJoin to actually go somewhere.

dooglus

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Quote from: phelix on October 29, 2015, 12:19:29 PM

Quote from: gmaxwell on August 21, 2013, 09:35:24 PM

The bounty fund will pay out [...] for completed work proposed in this thread that furthers the goal of making improved transaction privacy a practical reality for Bitcoin users.

Would this suite Joinmarket? https://bitcointalksearch.org/topic/ann-joinmarket-coinjoin-that-people-will-actually-use-919116

Was the work proposed in this thread?

If so, JoinMarket definitely qualifies.

phelix

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Quote from: gmaxwell on August 21, 2013, 09:35:24 PM

In order to further incentivize work in this space there is now a multisignature escrow bounty fund:

3M8XGFBKwkf7miBzpkU3x2DoWwAVrD1mhk
(yes, Bitcoin addresses can also start with a 3)

This is a two-of-three multisignature escrow with myself, Theymos, and Pieter Wuille as signers. To release any coin sent to this address at least two of these people must sign the transaction.

The bounty fund will pay out as funds are available according to the signers best judgment for completed work proposed in this thread that furthers the goal of making improved transaction privacy a practical reality for Bitcoin users.

Please feel free to contribute to the above address to support work on this infrastructure.

Multisig address construction details:

Code:

Key from Theymos:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Here is a public key of mine, usable for the CoinJoin bounty fund:
02d5f2b9c68b22006161dfe58a78b37dc2b577e8bb4e4522940830264eb3b3a38b
-----BEGIN PGP SIGNATURE-----

iF4EAREIAAYFAlISs5MACgkQxlVWk9q1kednkgD/WvE3F1hSoKHIr+y7q3O6xbGp
FM+P/lVbi/nZugrlNKABALMhYih2Ov80OS1PLMX9UpONn2eE2Xu+ZkxZ2SkQFfCU
=lFI0
-----END PGP SIGNATURE-----

Key from Gmaxwell:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Here is a public key of mine, usable for the CoinJoin bounty fund:
027b48575c15712867a8a1e6c9f52f510946130bbdf3b1e2feb344b8b68232ffb1
-----BEGIN PGP SIGNATURE-----

iEYEARECAAYFAlIbCV4ACgkQrIWTYrBBO/ooAgCdG9twTEFH5q+5Pip9qDOGsoww
a7YAoLfVP4CBaxk5mnpMXVHpQXqgVwxL
=k1JR
-----END PGP SIGNATURE-----

Key from Pieter:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Here is a public key of mine, usable for the CoinJoin bounty fund:
0292782efcb08d621c360d055f407c8e75ffbbd06f6b7009c1432ca9eaa6732592
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
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=70Dh
-----END PGP SIGNATURE-----

2-of-3 Address construction:
$ bitcoind createmultisig 2 '["02d5f2b9c68b22006161dfe58a78b37dc2b577e8bb4e4522940830264eb3b3a38b","027b48575c15712867a8a1e6c9f52f510946130bbdf3b1e2feb344b8b68232ffb1","0292782efcb08d621c360d055f407c8e75ffbbd06f6b7009c1432ca9eaa6732592"]'
{
"address" : "3M8XGFBKwkf7miBzpkU3x2DoWwAVrD1mhk",
"redeemScript" : "522102d5f2b9c68b22006161dfe58a78b37dc2b577e8bb4e4522940830264eb3b3a38b21027b48575c15712867a8a1e6c9f52f510946130bbdf3b1e2feb344b8b68232ffb1210292782efcb08d621c360d055f407c8e75ffbbd06f6b7009c1432ca9eaa673259253ae"
}

Would this suite Joinmarket? https://bitcointalksearch.org/topic/ann-joinmarket-coinjoin-that-people-will-actually-use-919116

Mixles

member

Activity: 63

Merit: 11

Quote from: belcher on June 16, 2015, 08:28:04 AM

It looks like you might need to write some code, as the post says "for completed work proposed in this thread that furthers the goal of making improved transaction privacy a practical reality for Bitcoin users."

Just as well that it does not say "for completed code". Otherwise I would be going against the thing. In a knowledge economy, new knowledge (and new code) takes a lot of completed works. Anyway, the review is not complete yet so my claim might not be valid. And even if it is valid or invalid logically, the fund is ultimately at the discretion of two individuals. If they want to encourage or discourage this kind of research is up to them.

belcher

sr. member

Activity: 261

Merit: 523

Quote from: Mixles on June 12, 2015, 07:13:32 AM

Quote from: gmaxwell on August 21, 2013, 09:35:24 PM

In order to further incentivize work in this space there is now a multisignature escrow bounty fund:

3M8XGFBKwkf7miBzpkU3x2DoWwAVrD1mhk
(yes, Bitcoin addresses can also start with a 3)

This is a two-of-three multisignature escrow with myself, Theymos, and Pieter Wuille as signers. To release any coin sent to this address at least two of these people must sign the transaction.

The bounty fund will pay out as funds are available according to the signers best judgment for completed work proposed in this thread that furthers the goal of making improved transaction privacy a practical reality for Bitcoin users.

Please feel free to contribute to the above address to support work on this infrastructure.

I would like to make a claim on this fund for work done on Compact Confidential Transactions (subject to the ongoing peer review).

https://bitcointalksearch.org/topic/m.11597427

CoinJoin should 'just work' in this scheme, and has a similar interface to gmaxwell's Confidential Transactions for keeping participant's balances hidden from other participants.

Participants generate some random inputs, and same number of random outputs, to themselves with a zero sum, and ensure that they do not introduce any fuzz over/underflow, so the fee is fixed.

An alternative approach, is to let participants share only their fee delta, guaranteeing that everyone makes the same fee adjustment, in which case the number of outputs can also differ to the number of inputs for each participant.

If anyone puts in too much or too little, their sum, and the whole transaction sum, won't come out as zero and the transaction will be invalid.

It looks like you might need to write some code, as the post says "for completed work proposed in this thread that furthers the goal of making improved transaction privacy a practical reality for Bitcoin users."

Mixles

member

Activity: 63

Merit: 11

Quote from: gmaxwell on August 21, 2013, 09:35:24 PM

In order to further incentivize work in this space there is now a multisignature escrow bounty fund:

3M8XGFBKwkf7miBzpkU3x2DoWwAVrD1mhk
(yes, Bitcoin addresses can also start with a 3)

This is a two-of-three multisignature escrow with myself, Theymos, and Pieter Wuille as signers. To release any coin sent to this address at least two of these people must sign the transaction.

The bounty fund will pay out as funds are available according to the signers best judgment for completed work proposed in this thread that furthers the goal of making improved transaction privacy a practical reality for Bitcoin users.

Please feel free to contribute to the above address to support work on this infrastructure.

I would like to make a claim on this fund for work done on Compact Confidential Transactions (subject to the ongoing peer review).

https://bitcointalksearch.org/topic/m.11597427

CoinJoin should 'just work' in this scheme, and has a similar interface to gmaxwell's Confidential Transactions for keeping participant's balances hidden from other participants.

Participants generate some random inputs, and same number of random outputs, to themselves with a zero sum, and ensure that they do not introduce any fuzz over/underflow, so the fee is fixed.

An alternative approach, is to let participants share only their fee delta, guaranteeing that everyone makes the same fee adjustment, in which case the number of outputs can also differ to the number of inputs for each participant.

If anyone puts in too much or too little, their sum, and the whole transaction sum, won't come out as zero and the transaction will be invalid.

belcher

sr. member

Activity: 261

Merit: 523

I'm pleased to announce the mainnet version of JoinMarket.

Expect glitches and a command line interface. But it works.

Here's some CoinJoins people have already done
https://blockchain.info/tx/601d9c15bc1edd2fe3e5c853ed111d11e9c0a5fb66c75571c7f10fa0d8ab23bb 5-party coinjoin
https://blockchain.info/tx/b85a3b563474ca98ba1809460e61a50053899c21f9869afb6a3a6d4b4cb00b7c 4-party coinjoin
https://blockchain.info/tx/e8b793b3464641df9404993c3101f81208b2d774f51a1ec748a608fbc9e22629 3-party coinjoin
https://blockchain.info/tx/665a9d7848cc0d28869ef866ca9a1117f20358e1e372dbbb01f1b75054584e70 3-party coinjoin

Only pocket change amounts for now, if anyone found an exploit bug they could theoretically clean out your wallet. My yield generator bot is running happily right now, I've already earned about 25000 satoshi.

I will be working on an Electrum plugin to make it easy to use. Electrum doesn't have a testnet version which is one reason we've moved to the mainnet now.

molecular

donator

Activity: 2772

Merit: 1019

Quote from: belcher on January 09, 2015, 04:50:13 PM

Last few months I've been working on an implementation of my idea.

I'm calling it Joinmarket.

https://bitcointalksearch.org/topic/m.10096718

The coinjoiner bots meet in an IRC channel. The bots announce their orders in an open-outcry trading pit style. Transaction data is sent between users as IRC private messages. Encryption is a planned feature to stop the IRC server eavesdropping. I have plans one day to move away from IRC entirely and have the users meet in some kind of peer to peer network.

Github: https://github.com/chris-belcher/joinmarket
IRC: irc.freenode.net #joinmarket

I checked it out, it's a great idea that already works! Thank you!

Looking at the TODO and some of the code it seems there's still quite a bit of work to be done, though.

Seems to me electrum integration would be a rather low-hanging fruit, no?

belcher

sr. member

Activity: 261

Merit: 523

Last few months I've been working on an implementation of my idea.

I'm calling it Joinmarket.

https://bitcointalksearch.org/topic/m.10096718

The coinjoiner bots meet in an IRC channel. The bots announce their orders in an open-outcry trading pit style. Transaction data is sent between users as IRC private messages. Encryption is a planned feature to stop the IRC server eavesdropping. I have plans one day to move away from IRC entirely and have the users meet in some kind of peer to peer network.

Github: https://github.com/chris-belcher/joinmarket
IRC: irc.freenode.net #joinmarket

belcher

sr. member

Activity: 261

Merit: 523

Quote from: HostFat on November 23, 2014, 11:27:02 AM

Quote from: belcher on November 23, 2014, 10:28:47 AM

I'm coding an implementation of my idea. Stay tuned.

By the way, does anyone have any ideas for the name of the project?

Yup, I hope to see it implemented on Darkwallet

Yep I agree.
Hopefully something like this will be in many kinds of wallets. An Electrum plugin also seems like a low-hanging fruit.

Topic: CoinJoin: Bitcoin privacy for the real world - page 8. (Read 294649 times)