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Title: Non-standard transactions in the block chain Post by: genjix on July 09, 2011, 07:33:44 AM Hi,
I noticed that BitcoinJ doesn't verify non standard transactions. Are there any non standard transactions in the current block chain? When I say standard transactions, I mean only [sig] [pubkey] OP_DUP OP_HASH160 <pubkeyhash> OP_EQUALVERIFY OP_CHECKSIG And, [sig] [pubkey] OP_CHECKSIG Thanks Title: Re: Non-standard transactions in the block chain Post by: hashcoin on July 09, 2011, 07:42:12 AM Does bitcoinj verify any transactions?
http://code.google.com/p/bitcoinj/source/browse/trunk/src/com/google/bitcoin/core/Script.java opCheckSig just returns true... Title: Re: Non-standard transactions in the block chain Post by: theymos on July 09, 2011, 07:42:49 AM There are. BitcoinJ only does SPV, though, so it doesn't need to verify everything.
Title: Re: Non-standard transactions in the block chain Post by: genjix on July 10, 2011, 02:48:06 AM Are we talking about a huge list here or just a select few?
If not, would someone link a random selection of them? Anything that uses more than: OP_PUSHDATA1 OP_PUSHDATA2 OP_PUSHDATA4 OP_DUP OP_DROP OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG Title: Re: Non-standard transactions in the block chain Post by: Mike Hearn on July 10, 2011, 01:19:04 PM See the "strange transactions" list on blockexplorer.com
Title: Re: Non-standard transactions in the block chain Post by: genjix on July 10, 2011, 02:21:19 PM Hhahaha! That's why IsStandard exists :)
Are those 3 the only non-standard transactions? They're very old it seems. Thanks for that. EDIT: How did that transaction not fail? OP_CHECKSIG pops twice from the stack and after the first pass, the stack would be 0 and then fail. Title: Re: Non-standard transactions in the block chain Post by: Mike Hearn on July 10, 2011, 02:24:00 PM There are more on the testnet. Also depending on how you define "standard" there's a tx somewhere that has lots of zero value outputs that steganographically encodes the Bitcoin logo. It passes the IsStandard checks but is not financial in nature.
Title: Re: Non-standard transactions in the block chain Post by: genjix on July 10, 2011, 02:49:07 PM That's fine. As long as they don't use more than:
OP_PUSHDATA1 OP_PUSHDATA2 OP_PUSHDATA4 OP_DUP OP_DROP OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG (for the time being at least ;D) |