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Author Topic: New Service: (amost) trust free tor based blind bitcoin mixer -- TESTNET only  (Read 5802 times)
BlindMixerDR
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April 13, 2013, 09:44:36 PM
 #1

I am announcing a new bitcoin mixing service using Chaum's blind signature scheme. Since it is not allowed to announce tor urls on bitcointalk, you can view the url on reddit here.
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April 13, 2013, 10:38:43 PM
 #2

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

The website has a "Certificate Authority" signing key to certify the RSA keys used on the site. Here it is:

- -----BEGIN CERTIFICATE-----
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- -----END CERTIFICATE-----

There is one master PGP encryption key, and all other keys get authority from that. Here it is:

- -----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.10 (GNU/Linux)

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=DMTs
- -----END PGP PUBLIC KEY BLOCK-----
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)

iQIcBAEBCgAGBQJRad2RAAoJEHnPByiWPIV3s+oQAK5s9mBlyldsOCmeab+vEiSX
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FpQN/vxwYiVgPHmAo5YU
=25dx
-----END PGP SIGNATURE-----
BlindMixerDR
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April 15, 2013, 06:55:12 PM
 #3

I need to say more about this service. The system operates on the basis of minimum trust. From the time you receive a MixAddress from the mixer, until the time you receive your new mixed coins, you need almost zero trust in the mixer.

The mix address you receive is signed by a key which can be traced to the PGP key posted here in the forum. So if you send coins there, we cannot deny the address belongs to us.

When you claim the transaction and send your new address to the mixer (the 'SinkAddress') this is also signed (blind signed) by the mixer. If you have the unblinded signature and we do not send you the new mixed coins, you can prove that we are scammers.
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April 15, 2013, 07:07:04 PM
 #4

Somebody has successfully sent coins to the mixer, and redeemed the new mixed coins. If they post the two transaction IDs (sending and receiving) and the value of RandomPrime to the reddit thread, they can have a reward of 0.01BTC.

edit: Really, all they need to post is the RandomPrime - I already know the two transaction IDs (only because there were only two transactions mixed and I made one of them. In the future when many people use the mixer this would not be possible).

The mixer has received 1.0, 0.5, 0.2, 0.1 and 0.05 BTC transactions (always testnet) - is it all the same person? The 0.05BTC transaction is now redeemed.
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