Rusty, this doesn't play well with SIGHASH_SINGLE which is used in assurance contracts among other things. Sometimes the ordering is set by the signing logic itself... On Jun 5, 2015 9:43 PM, "Rusty Russell" <ru...@rustcorp.com.au> wrote:
> Title: Canonical Input and Output Ordering > Author: Rusty Russell <ru...@rustcorp.com.au> > Discussions-To: "Bitcoin Dev" <bitcoin-development@lists.sourceforge.net> > Status: Draft > Type: Standards Track > Created: 2015-06-06 > > Abstract > > This BIP provides a canonical ordering of inputs and outputs when > creating transactions. > > Motivation > > Most bitcoin wallet implementations randomize the outputs of > transactions they create to avoid trivial linkage analysis (especially > change outputs), however implementations have made mistakes in this area > in the past. > > Using a canonical ordering has the same effect, but is simpler, more > obvious if incorrect, and can eventually be enforced by IsStandard() and > even a soft-fork to enforce it. > > Specification > > Inputs should be ordered like so: > index (lower value first) > txid (little endian order, lower byte first) > > Outputs should be ordered like so: > amount (lower value first) > script (starting from first byte, lower byte first, shorter wins) > > Rationale > > Any single wallet is already free to implement this, but if other > wallets do not it would reduce privacy by making those transactions > stand out. Thus a BIP is appropriate, especially if this were to > become an IsStandard() rule once widely adopted. > > Because integers are fast to compare, they're sorted first, before the > lexographical ordering. > > The other input fields do not influence the sort order, as any valid > transactions cannot have two inputs with the same index and txid. > > Reference Implementation > > https://github.com/rustyrussell/bitcoin/tree/bip-in-out-ordering > > > ------------------------------------------------------------------------------ > _______________________________________________ > Bitcoin-development mailing list > Bitcoin-development@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bitcoin-development >
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