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From: Gregory Maxwell <greg@xiph.org>
To: Tomas <tomas@tomasvdw.nl>
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Using a storage engine without UTXO-index
Date: Fri, 7 Apr 2017 01:09:26 +0000	[thread overview]
Message-ID: <CAAS2fgR0t=QG6HfhF1MKW3k_4mjv7rjWE4T3-wdiL2fB6TVV4Q@mail.gmail.com> (raw)
In-Reply-To: <1491526132.723002.936945760.06A943C6@webmail.messagingengine.com>

On Fri, Apr 7, 2017 at 12:48 AM, Tomas <tomas@tomasvdw.nl> wrote:
> Bitcrust separates script validation (base load, when transaction come
> in) from order validation (peak load, when blocks come in).

How do you deal with validity rules changing based on block height?

> For script validation it would obviously need the ~2GB (or I think
> ~1.5GB) of outputs needed to validate these.

So it sounds like to work the software still needs an analog of a
(U)TXO database? I am confused by the earlier comments about thinking
the the resource consumption of the (U)TXO database is not a
consideration in your design.

> For order validation it
> needs ~200mb or the spent-index (for bit-lookups) and I would guess
> roughly ~500mb of the spent-tree (for scanning), though I don't think
> the 5.7GB full spend tree isn't worth pruning anytime soon.

If you get a transaction claiming to spend 0xDEADBEEFDEADBEEF, an
output that never existed how does your spent index reject this spend?


  reply	other threads:[~2017-04-07  1:09 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-06 22:12 [bitcoin-dev] Using a storage engine without UTXO-index Tomas
2017-04-06 23:38 ` Eric Voskuil
2017-04-07  0:17   ` Tomas
2017-04-08 22:37     ` Eric Voskuil
2017-04-08 23:58       ` Tomas
2017-04-11  1:44         ` Eric Voskuil
2017-04-11  8:43           ` Tomas
2017-04-11  9:41             ` Eric Voskuil
2017-04-11 10:04               ` Tomas
     [not found] ` <CAAS2fgTEMCkDWdhCWt1EsUrnt3+Z_8m+Y1PTsff5Rc0CBnCKWQ@mail.gmail.com>
2017-04-07  0:48   ` Tomas
2017-04-07  1:09     ` Gregory Maxwell [this message]
2017-04-07  1:29       ` Tomas
2017-04-07 18:52         ` Tom Harding
2017-04-07 19:42           ` Gregory Maxwell
2017-04-08 18:27             ` Tom Harding
2017-04-08 19:23               ` Tomas
2017-04-07  7:55 ` Marcos mayorga
2017-04-07  8:47   ` Tomas
2017-04-07 14:14     ` Greg Sanders
2017-04-07 16:02       ` Tomas
2017-04-07 18:18 ` Gregory Maxwell
2017-04-07 18:39   ` Bram Cohen
2017-04-07 19:55     ` Eric Voskuil
2017-04-07 21:44       ` Tomas
2017-04-07 23:51         ` Eric Voskuil
2017-04-07 21:14     ` Tomas
2017-04-08  0:44       ` Gregory Maxwell
2017-04-08  7:28         ` Tomas
2017-04-08 19:23           ` Johnson Lau
2017-04-08 19:56             ` Tomas
2017-04-08 20:21               ` Johnson Lau
2017-04-08 20:42                 ` Tomas
2017-04-08 22:12                 ` Gregory Maxwell
2017-04-08 22:34                   ` Tomas
2017-04-08 21:22     ` Troy Benjegerdes

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