-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 01/06/2014 10:13 AM, Peter Todd wrote: > On Sun, Jan 05, 2014 at 07:43:58PM +0100, Thomas Voegtlin wrote: >> I have written a Python-levelDB implementation of this UTXO >> hashtree, which is currently being tested, and will be added to >> Electrum servers. > > Along the lines of my recent post on blockchain data: > > Is it going to be possible to do partial prefix queries on that > tree?
There's really two tree structures being talked about here. Correct me if I'm wrong Thomas, but last time I looked at your code it was still implementing a 256-way PATRICIA trie, correct? This structure lends itself to indexing either scriptPubKey or H(scriptPubKey) with approximately the same performance characteristics, and in the "Ultimate blockchain compression" thread there is much debate about which to use. In the process of experimentation I've since moved from a 256-way PATRICIA trie to a bitwise, non-level-compressed trie structure - what I call proof-updatable trees in the BIP. These have the advantage of allowing stateless application of one proof to another, and as consequence enable mining & mempool operations without access to the UTXO set, so long as proofs are initially provided in the transaction & block wire format. The "disadvantage" is that performance is closely tied to key length, making H(scriptPubKey) the much more desirable option. I'm sure you see that as an advantage, however :) > Also have you considered creating per-block indexes of all > scriptPubKeys, spent or unspent, queryable via the same partial > prefix method? This would be quite easy to do, separate from the UTXO structure but using the same trie format. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJSy0iFAAoJEAdzVfsmodw434MQAIA/fDYT7SfMtfLEgDQKhXCn slRqFEx/HXjvgHHSYnbr9V+8LrGzNvT2ImebbV9ge8VlziAFNGIUq2EYhFs4kHWu GVm9aL8Jj/27SvM0tRwr9n2XIifKOh2sVINAjbv+UwPv/O+cULU95/b53DEF6aqI OWxioOR50TPe4t9AevAGVypNLm1DsyDdymhO9xyBN92xGTNj5QKL5hHG3kcsLIl1 7KaxO0w4UC2sdSGj9FeyH1b0zYg8FlzjJHc1CUshHwUwyYo8LRJtRypL5lrayERg Er/kIGEDovcenNBW8G79l+8VKPfB/lMTssT2pDiQL+1e1fg46CIQxHSyap2JSFTE jgleRk/+1NK/ZjOQ8dEBPZK3TE1WY3qlm/ekjG/8W5kXqcxzFBoAkeBNXuJ/8UMi mKe+DTmbp0xnvLO1p+hpugXKfrQSpcFL+ZvJHlFS1lz7O1N3WvuDCNP9El+L6ueM nFzjr1NTnX0z4vYtscI7qBKVqUrB7Z84c3O/lSYpw4Jilxl4trzV4cn7+AF7KWGM ktR9JJeIoNcJ2Zx4EpRp6OSwhtLkWZyLpPnidQ2p6ev2ytXpTpGsW/i5XS2w57UD 2IG5E0Q7Xzvd58lI/YollWQcagVOZdyzYXa+wVZoFQ6gLF47andpUmtUJOhI7gxv T/rWhPhkTMUn8TdvUcV/ =N9zM -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
