I believe tx have to be ordered sequentially within a block. Also since a tx is referenced by it's hash, it's practically impossible to make a self referential tx.
Aaron Voisine breadwallet.com On Sun, Jul 13, 2014 at 4:32 PM, Richard Moore <m...@ricmoo.com> wrote: > Hey all, > > I'm working on the UTXO database for my Python implementation of bitcoind > and have found a situation I did not realize was valid, but since it seems > to be, had a quick question. > > If you look at block #546 the 4th transaction's first input uses its own > block's 3rd transaction as an input. > https://blockchain.info/block/000000005a4ded781e667e06ceefafb71410b511fe0d5adc3e5a27ecbec34ae6 > > My question is, would the other way be valid, that is, could the 3rd > transaction of a block, use the 4th transaction from the same block as an > input? Or are transactions processed strictly top to bottom? > > Thanks, > RicMoo > > P.S. If it is valid, another question; what would happen if a transaction > was self-referencing? I realize it would be very difficult to find one, but > if I could find a transaction X whose input was X and had an output Y, would > Y be a new valid utxo, without being a generation transaction input? > > .·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸><(((º> > > Richard Moore ~ Founder > Genetic Mistakes Software inc. > phone: (778) 882-6125 > email: ric...@geneticmistakes.com > www: http://GeneticMistakes.com > > > ------------------------------------------------------------------------------ > Want fast and easy access to all the code in your enterprise? Index and > search up to 200,000 lines of code with a free copy of Black Duck® > Code Sight™ - the same software that powers the world's largest code > search on Ohloh, the Black Duck Open Hub! Try it now. > http://p.sf.net/sfu/bds > _______________________________________________ > Bitcoin-development mailing list > Bitcoin-development@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bitcoin-development > ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck® Code Sight™ - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
