See Sidechains[0], and Treechains[1]. But as always, without the proper incentives a block chain is unsustainable and vulnerable. [0]: http://sourceforge.net/p

See Sidechains[0], and Treechains[1]. But as always, without the proper incentives a block chain is unsustainable and vulnerable. [0]: http://sourceforge.net/p/bitcoin/mailman/message/32108143/ http://sourceforge.net/p/bitcoin/mailman/message/32108143/ [1]: https://www.mail-archive.com/bitcoin-development@lists.sourceforge.net/msg04388.html https://www.mail-archive.com/bitcoin-development@lists.sourc...