Early Bitcoin Privacy Ideas

EARLY BITCOIN PRIVACY IDEAS

2008
	PSEUDONYMITY
		Satoshi Nakamoto - Bitcoin Whitepaper: 10. Privacy: https://bitcoin.org/bitcoin.pdf
			"The traditional banking model achieves a level of privacy by limiting access to information to the parties involved and the trusted third party."
			"The public can see that someone is sending an amount to someone else, but without information linking the transaction to anyone."

	ADDRESS REUSE
		Satoshi Nakamoto - Bitcoin Whitepaper: 10. Privacy: https://bitcoin.org/bitcoin.pdf
			"As an additional firewall, a new key pair should be used for each transaction to keep them from being linked to a common owner."

	MULTI-INPUT HEURISTICS
		Satoshi Nakamoto - Bitcoin Whitepaper, 10. Privacy: https://bitcoin.org/bitcoin.pdf
			"Some linking is still unavoidable with multi-input transactions, which necessarily reveal that their inputs were owned by the same owner."

	CHAUMIAN E-CASH
		James A. Donald - Cryptography Mailing List Thread, Bitcoin P2P e-cash paper:
		https://satoshi.nakamotoinstitute.org/emails/cryptography/threads/1/#014834
		https://satoshi.nakamotoinstitute.org/emails/cryptography/threads/1/#014865
			"We will need a layer of account money on top of the bitcoins
				- supporting transactions of a hundred thousandth the size of the smallest coin,
				- and to support anonymity, chaumian money on top of the account money."

	RICOCHET
		Ray Dillinger - Cryptography Mailing List Thread, Bitcoin P2P e-cash paper: https://satoshi.nakamotoinstitute.org/emails/cryptography/threads/1/#014859
			"The owner of the coin needs to make a transaction... (sock puppet "spend")... This has to be done a random number of times."

2009
	P2EP
		Satoshi Nakamoto - Cryptography Mailing List Thread, Bitcoin v0.1 released: https://satoshi.nakamotoinstitute.org/emails/cryptography/threads/2/#014994
			"There are two ways to send money. If the recipient is online, you can enter their IP address and it will connect, get a new public key and send the transaction with comments."

2011
	CHAUMIAN MIXERS
		Duncan Townsend - Bitcointalk, Blindbitcoin.com
		https://bitcointalk.org/index.php?topic=12751.0
		https://bitcointalk.org/index.php?topic=12751.msg410033#msg410033
		https://bitcointalk.org/index.php?topic=12751.msg410631#msg410631
		https://bitcointalk.org/index.php?topic=12751.msg411292#msg411292
			"The site charges a 0.02BTC commission."
			"The potential liability of somebody finding an exploit and stealing from my customers, plus the potential legal liability is too much to shoulder for the amount of money that I could potentially make on that sort of thing. It makes me very sad to have to close the site""

	CENTRALIZED MIXERS
		Akemashite Omedetou - Bitcointalk, BitcoinFog: https://bitcointalk.org/index.php?topic=50037.0
			Today, it's a selective scam.

	COINJOIN
		hashcoin - Bitcointalk, https://bitcointalk.org/index.php?topic=12751.msg315793#msg315793
			"N people who want to mix coins get together and build a TX.  We get together in a circle and, starting from a blank piece of paper, pass it around the circle, each step adding our input and our output to a random location.  After it has been passed around once, it gets passed around again.  This time, assuming my input and output is still there, I sign the tx and pass it on.  If everyone signs it, it is broadcast and we're done."

		casascius - Bitcointalk, https://bitcointalk.org/index.php?topic=50037.msg609100#msg609100
			"The most secure way to anonymize funds I can think of, would be to offer a service that attempts to aggregate the funds being anonymized into one HUGE transaction"

		Meni Rosenfeld - Bitcointalk, https://bitcointalk.org/index.php?topic=54266.0
			"In this post I will discuss what I call a "mixing transaction", which allows you to move bitcoins from one of your addresses A1 to another address of yours A2, without a clear trace linking the two addresses."