814f0bae89
This converts the IsUnspendable function to make use of a combination of raw script analysis and the new tokenizer instead of the far less efficient parseScript thereby significantly optimizing the function. It is important to note that this new implementation intentionally has a semantic difference from the existing implementation in that it will now report scripts that are larger than the max allowed script size are unspendable as well. Finally, the comment is modified to explicitly call out the script version semantics. Note: this function was recently optimized in master, so the gains here are less noticable than other optimizations. The following is a before and after comparison of analyzing a large script: benchmark old ns/op new ns/op delta BenchmarkIsUnspendable-8 656 584 -10.98% benchmark old allocs new allocs delta BenchmarkIsUnspendable-8 1 0 -100.00% benchmark old bytes new bytes delta BenchmarkIsUnspendable-8 1 0 -100.00% |
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|---|---|---|
| .. | ||
| data | ||
| bench_test.go | ||
| consensus.go | ||
| doc.go | ||
| engine.go | ||
| engine_test.go | ||
| error.go | ||
| error_test.go | ||
| example_test.go | ||
| hashcache.go | ||
| hashcache_test.go | ||
| log.go | ||
| opcode.go | ||
| opcode_test.go | ||
| pkscript.go | ||
| pkscript_test.go | ||
| README.md | ||
| reference_test.go | ||
| script.go | ||
| script_test.go | ||
| scriptbuilder.go | ||
| scriptbuilder_test.go | ||
| scriptnum.go | ||
| scriptnum_test.go | ||
| sigcache.go | ||
| sigcache_test.go | ||
| sign.go | ||
| sign_test.go | ||
| stack.go | ||
| stack_test.go | ||
| standard.go | ||
| standard_test.go | ||
| tokenizer.go | ||
| tokenizer_test.go | ||
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
-
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. -
Counting Opcodes in Scripts
Demonstrates creating a script tokenizer instance and using it to count the number of opcodes a script contains.
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:
-
Download the public key from the Conformal website at https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt
-
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.