I remember watching Adam Back's talk about this concept when he was in Israel at a meeting I think sponsored by Meni Rosenfeld.
Request for comments
http://voxelsoft.com/dev/sumcoin.pdf
CT and Anon MiniChain in one coin? Impressive tech and elegant implementation! Do want.
Any thoughts on which PoW is a good fit? My favorite ATM is BBR's Wild Keccak (http://boolberry.com/files/Block_Chain_Based_Proof_of_Work.pdf).
I see Coloured Coins aren't compatible. If implemented independently, are there more trade-offs with other trendy functions like CIYAM's AT, OP_RETURN, or CHECKLOCKTIMEVERIFY? What about proof of stake?
If the Monero folk decide to put Sumcoin under their hood, would you help the core devs with integration?
Sumcoin is work/stake agnostic (stake may require disclosure), and does not break the core scripting language; so the opcodes remain possible.
It is early yet, want to get this out for review to the people who can - very possible I've made some mistakes.
Off-top-my-head, Monero seems like the easiest fit because it already has a view key, but I have not looked in detail.
Thanks for WK. Long term, it might be possible to auto-generate equivalent-difficulty hash functions. A new hash function for every block. That would fix things back down to FPGA technology level, and contribute better to generic hardware development.