>> (p.1)
    Author Topic: Multi-owned coins  (Read 1392 times)

    • fabianhjr (OP)
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    March 24, 2011, 11:30:31 PM
     #1
    Hey, I am just thinking that an added feature might be the ability for a coin to be "owned" by multiple addresses. So in order to make a payment with this keys the owners, all of them, must agree. This could also increase the security against fraud in the following scenario:

    A wants to buy from B
    A adds B's public key to the owner list of the involved coins so now A and B own the coins
    B delivers the goods and services and then A removes his key from the owner list
    Now B can use the coin freely

    Please discuss. Cheesy
    Public Key
    https://keyserver.pgp.com/vkd/DownloadKey.event?keyid=0x1A3011671C382664
    http://pgp.mit.edu/pks/lookup?op=get&fingerprint=on&search=0x1A3011671C382664

  • theymos
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    March 24, 2011, 11:36:16 PM
     #2
    That's already supported by the protocol with transaction scripts.

    Satoshi described that escrow use of multi-owner coins here:
    http://bt.irlbtc.com/view/750.0
    1NXYoJ5xU91Jp83XfVMHwwTUyZFK64BoAD

  • fabianhjr (OP)
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    March 24, 2011, 11:49:31 PM
     #3
    Well, the last message was by august. It is a shame it didn't continue.

    Now: What about 3 or four owners? Say for instance that I operate a bank and want to exchange Bitcoins. As a precaution there is the cashier's key, the vault-master's key and my key. So neither the cashier or the vault-master can get the Bitcoins to disappear and only if we all agree the Bitcoins can be release. Of course, neither the cashier or the vault-master can disappear the key because you keep a backups. Tongue
    Public Key
    https://keyserver.pgp.com/vkd/DownloadKey.event?keyid=0x1A3011671C382664
    http://pgp.mit.edu/pks/lookup?op=get&fingerprint=on&search=0x1A3011671C382664

  • theymos
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    March 25, 2011, 12:11:10 AM
     #4
    Up to 20 keys can be required.
    1NXYoJ5xU91Jp83XfVMHwwTUyZFK64BoAD

  • fabianhjr (OP)
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    March 25, 2011, 12:24:50 AM
     #5
    Then what this:
    A buys from B
    A uses the multi-own feature to escrow the Bitcoins to B
    B then buys from C and uses the multi-own feature to add him
    B never gives the goods to A
    C delivers goods to C who keeps them

    The coins never really get released and are still owned by A , who got scammed.
    Public Key
    https://keyserver.pgp.com/vkd/DownloadKey.event?keyid=0x1A3011671C382664
    http://pgp.mit.edu/pks/lookup?op=get&fingerprint=on&search=0x1A3011671C382664

  • theymos
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    March 25, 2011, 01:30:36 AM
     #6
    You can't add owners without making a new transaction.
    1NXYoJ5xU91Jp83XfVMHwwTUyZFK64BoAD

  • Mike Hearn
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    March 25, 2011, 11:45:29 AM
     #7
    Look at OP_CHECKMULTISIG for how to do this.

  • Nefario
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    March 25, 2011, 12:07:08 PM
     #8
    Posting here just to make it easier for me to find.
    PGP key id at pgp.mit.edu 0xA68F4B7C

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