Bitcoin M-of-N Multisig P2SH implemented in Go
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README.md

go-bitcoin-multisig GoDoc

Bitcoin M-of-N Multisig Pay-to-ScriptHash (P2SH) Transaction Builder, built in Go

##Features

  • Generate public/private key pairs valid for use in P2PKH/Multisig Bitcoin transactions

    • Up to 100 key pairs generated in one command.
    • Disclaimer: These key pairs are cryptographically secure to the limits of the crypto/rand cryptography package in Golang. They should not be used without further security audit in production systems.
  • Generate M-of-N multisig P2SH addresses given a set of specified public keys, M and N.

    • Up to 7-of-7 multisig.
  • Fund a given multisig P2SH address from a standard Bitcoin wallet.

  • Spend funds from multisig address to standard Bitcoin wallet.

##Build instructions

First, follow the instructions at go-secp256k1 to compile bitcoin/c-secp256k1, which is required for go-bitcoin-multisig.

Next, if you have your Go environment set up in the usual way, simply run:

go get github.com/soroushjp/go-bitcoin-multisig

And that's it! Now you can run the binary:

go-bitcoin-multisig --help

Or, if you don't have $GOPATH/bin in your $PATH environment variable, try:

$GOPATH/bin/go-bitcoin-multisig --help

##Usage

Full list of subcommands can be seen using go-bitcoin-multisig --help. Flags for each subcommand can be seen using go-bitcoin-multisig --help

###Generate Keys

go-bitcoin-multisig keys <optional-flags>

Optional Flags:

  • --count=n
    • No. of key pairs to generate. Generates n key pairs.
  • --concise
    • Turn on concise output. Default is off (verbose output).

Example:

go-bitcoin-multisig keys --count 3 --concise

Generate P2SH Multisig Address

go-bitcoin-multisig address --m=M --n=N --public-keys=PUBLIC-KEYS(Comma separated, Hex format)

Example: (2-of-3 Multisig)

go-bitcoin-multisig address --m 2 --n 3 --public-keys 04a882d414e478039cd5b52a92ffb13dd5e6bd4515497439dffd691a0f12af9575fa349b5694ed3155b136f09e63975a1700c9f4d4df849323dac06cf3bd6458cd,046ce31db9bdd543e72fe3039a1f1c047dab87037c36a669ff90e28da1848f640de68c2fe913d363a51154a0c62d7adea1b822d05035077418267b1a1379790187,0411ffd36c70776538d079fbae117dc38effafb33304af83ce4894589747aee1ef992f63280567f52f5ba870678b4ab4ff6c8ea600bd217870a8b4f1f09f3a8e83 

Fund Multisig Address

go-bitcoin-multisig fund --private-key=PRIVATE-KEY --input-tx=INPUT-TX --amount=AMOUNT --destination=DESTINATION

Example:

go-bitcoin-multisig fund --input-tx 3ad337270ac0ba14fbce812291b7d95338c878709ea8123a4d88c3c29efbc6ac --private-key 5JJyqG4bb15zqi7fTA4b227aUxQhBo1Ux6qX69ngeXYLr7fk2hs --destination 347N1Thc213QqfYCz3PZkjoJpNv5b14kBd --amount 65600

Spend Multisig Funds

go-bitcoin-multisig spend --private-keys=PRIVATE-KEYS(Comma separated) --destination=DESTINATION --redeemScript=REDEEMSCRIPT --input-tx=INPUT-TX --amount=AMOUNT

Example:

go-bitcoin-multisig spend --input-tx 02b082113e35d5386285094c2829e7e2963fa0b5369fb7f4b79c4c90877dcd3d --amount 55600 --destination 18tiB1yNTzJMCg6bQS1Eh29dvJngq8QTfx --private-keys 5JruagvxNLXTnkksyLMfgFgf3CagJ3Ekxu5oGxpTm5mPfTAPez3,5JjHVMwJdjPEPQhq34WMUhzLcEd4SD7HgZktEh8WHstWcCLRceV --redeemScript 524104a882d414e478039cd5b52a92ffb13dd5e6bd4515497439dffd691a0f12af9575fa349b5694ed3155b136f09e63975a1700c9f4d4df849323dac06cf3bd6458cd41046ce31db9bdd543e72fe3039a1f1c047dab87037c36a669ff90e28da1848f640de68c2fe913d363a51154a0c62d7adea1b822d05035077418267b1a1379790187410411ffd36c70776538d079fbae117dc38effafb33304af83ce4894589747aee1ef992f63280567f52f5ba870678b4ab4ff6c8ea600bd217870a8b4f1f09f3a8e8353ae

Bonus: Above examples are real multisig transactions created with go-bitcoin-multisig. One lucky reader can redeem the balance in the real tx above with private key: 5Jmnhuc5gPWtTNczYVfL9yTbM6RArzXe3QYdnE9nbV4SBfppLc #tip :) ...And it's gone!

##Notes

  • Transaction Fees:

    • The transaction fee is the difference between the specified amount when funding/spending multisig and balance of unspent input.
  • Standardness:

    • Will generate up to 7-of-7 m-of-n addresses, but warning generated for suspected non-standard addresses.
    • m*73 + n*66 <= 496 is considered standard. Non-standard transactions may still get confirmed but may take much longer (testing with 7-of-7 multisig took 45 minutes with 60000 satoshi (~$0.22 current BTC price) transaction fee).
    • See Pieter Wuille's answer on Stack Exchange for validity and standardness rules of Bitcoin protocol.
  • Order of keys:

    • As per protocol rules, private keys provided to spend a multisig wallet have to be given in the same order (skipping keys is okay when m < n, but still in the same order) as given when the P2SH address was generated.

##Tests

go-bitcoin-multisig includes a full suite of tests to test low and high level functionality, including expected multisig funding and spending transactions. To run tests:

go test ./... -v

##License

go-bitcoin-multisig project is released under the terms of the MIT license. Thank you to prettymuchbryce for his hellobitcoin project which provided both early code and inspiration for this project.

##Find out more

Built as a working demonstration of the P2SH M-of-N multisig functionality in the Bitcoin protocol and to serve as a easy to read Go reference implementation of raw multisig transactions. If you would like to use this code or similar functionality in your application, I'd love to hear from you so I can extend the project in more useful ways for the Bitcoin community. Reach out on Twitter @soroushjp or email me_AT_soroushjp.com.