6b802379ec
This modifies calcSignatureHash to use a shallow copy of the transaction versus a deep copy since the actual scripts themselves are not modified and therefore don't need to be copied. This is being done because profiling the most overall allocated space shows that the deep copy performed in calcSignatureHash accounts for nearly 20% of all allocations on a synced running instance. Also, copying all of the additional data makes it more time consuming as well. With this change, that figure drops from ~20% to ~5% of all allocations. The following benchmark shows the relative speedups and allocation reduction as a result of the optimization on my system. In particular, the changes result in approximately a 15% speedup and a whopping 99.89% reduction in allocations when using a large transaction with thousands of inputs which was the worst case scenario. benchmark old allocs new allocs delta -------------------------------------------------------------------- BenchmarkCalcSignatureHash 11151 12 -99.89% benchmark old ns/op new ns/op delta -------------------------------------------------------------------- BenchmarkCalcSignatureHash 3599845 3056359 -15.10%
txscript
Package txscript implements the bitcoin transaction script language. There is a comprehensive test suite.
This package has intentionally been designed so it can be used as a standalone package for any projects needing to use or validate bitcoin transaction scripts.
Bitcoin Scripts
Bitcoin provides a stack-based, FORTH-like language for the scripts in the bitcoin transactions. This language is not turing complete although it is still fairly powerful. A description of the language can be found at https://en.bitcoin.it/wiki/Script
Installation and Updating
$ go get -u github.com/btcsuite/btcd/txscript
Examples
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Standard Pay-to-pubkey-hash Script
Demonstrates creating a script which pays to a bitcoin address. It also prints the created script hex and uses the DisasmString function to display the disassembled script. -
Extracting Details from Standard Scripts
Demonstrates extracting information from a standard public key script. -
Manually Signing a Transaction Output
Demonstrates manually creating and signing a redeem transaction.
GPG Verification Key
All official release tags are signed by Conformal so users can ensure the code has not been tampered with and is coming from the btcsuite developers. To verify the signature perform the following:
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Download the public key from the Conformal website at https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt
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Import the public key into your GPG keyring:
gpg --import GIT-GPG-KEY-conformal.txt -
Verify the release tag with the following command where
TAG_NAMEis a placeholder for the specific tag:git tag -v TAG_NAME
License
Package txscript is licensed under the copyfree ISC License.