MultiSig BUT with Bitcoin Addresses NOT Public Keys - page 2.

damianmontero

newbie

Activity: 9

Merit: 0

Quote from: edmundedgar on January 08, 2015, 05:39:26 PM

Code:

OP_IF
OP_DUP OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG.
OP_ELSE
OP_DUP OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG.
OP_ENDIF

1) Peter Todd. You say your version is better. But it seems to include the PubKeys. I need to include two (or at least one) Bitcoin Address (because I don't have the PubKey, they're not my addresses)
So will BIP19 help me here? and is it available now?

2) Edmundedgar: Thank you. So your solution should work once everyone moves to 0.10 bitcoin and if maybe the right pool catches my transaction. Did I understand that right? If the wrong pool gets it. does it go back in the queue until they THEY process the transaction?

I'm new at this. but hopefully your link for the bitcoin-branching-transaction-builder will help. but their "tests" and therefor only documentation keeps mentioning PubKeys. So I'm trying to make the code work right now and it's not easy.

I'll update this thread with my solution if I can get bitcoinJS-lib to build.

Peter Todd

legendary

Activity: 1120

Merit: 1168

edmundedgar is on the right track, but an even better way to do it is to adapt Luke-Jr's BIP19:
{pubkey} OP_CHECKSIG OP_SWAP {pubkey} OP_CHECKSIG OP_ADD OP_SWAP {pubkey} OP_CHECKSIG OP_ADD {n} OP_EQUAL
Replace {pubkey} OP_CHECKSIG as appropriate; you can even mix-n-match multiple forms.

https://github.com/bitcoin/bips/blob/master/bip-0019.mediawiki

edmundedgar

sr. member

Activity: 352

Merit: 252

https://www.realitykeys.com

Quote from: DeathAndTaxes on January 08, 2015, 05:07:48 PM

Technically an address can be created from the hash of a custom script (P2SH) but I am unsure if there are the necessary op_codes in the scripting language to allow you to validate against signature of one of many pubkeyhashes.

You can do "or" cases like this with branching OP_IFs (inside P2SH). Simplest case 1/2:

Code:

OP_IF
OP_DUP OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG.
OP_ELSE
OP_DUP OP_HASH160 OP_EQUALVERIFY OP_CHECKSIG.
OP_ENDIF

...then sign with an OP_1 or OP_0 flag on the end to say which branch should be used.

For JavaScript this may help:
https://github.com/edmundedgar/bitcoin-branching-transaction-builder
I haven't tried it for this specific case, but I think it would be OK.

This is currently non-standard, but it should become standard as people start running bitcoin 0.10. In the meantime you should be able to broadcast it with blockchain.info, and it should get mined by Discus Fish or Eligius, which will generally get it mined in an hour or two.

edmundedgar

sr. member

Activity: 352

Merit: 252

https://www.realitykeys.com

Quote from: damianmontero on January 08, 2015, 04:36:19 PM

Thank you DeathAndTaxes;

How can I make a multiSig address with just regular Bitcoin Addresses?

I'm trying to create a bitcoin address where any ONE of TWO (or THREE) bitcoin private addresses can SIGN a transaction.

You could make a special script to do this, but you'd probably need some special software to sign it. Is that an acceptable requirement? If so we can talk about the best way to script it.

DeathAndTaxes

donator

Activity: 1218

Merit: 1080

Gerald Davis

Once again "No there is no way to perform multisig with addresses."

You must have two or more public keys. Not addresses or pubkeyhashes.

Technically an address can be created from the hash of a custom script (P2SH) but I am unsure if there are the necessary op_codes in the scripting language to allow you to validate against signature of one of many pubkeyhashes.

damianmontero

newbie

Activity: 9

Merit: 0

Thank you DeathAndTaxes;

How can I make a multiSig address with just regular Bitcoin Addresses?

I'm trying to create a bitcoin address where any ONE of TWO (or THREE) bitcoin private addresses can SIGN a transaction.

DeathAndTaxes

donator

Activity: 1218

Merit: 1080

Gerald Davis

No there is no way to perform multisig with addresses.
No you can not compute a public key from an address.

An address is the pubkeyhash encoded in base58 with version and checksum. It can be decoded back to the pubkeyhash but you can get pubkey from the pubkeyhash because hashing functions are by their nature one way.

damianmontero

newbie

Activity: 9

Merit: 0

I'm building a Bitcoin ATM that will use Multi-Sig for security and I realized I can't create a MultiSig Account with ONLY the Bitcoin Addresses.

Why does MultiSig Use Public Key's as opposed to the compressed 1xxxxx Bitcoin address?

I feel that most of the time I'll be building MultiSig Accounts with other people. Most of whom will NOT have their public Key. Only their private key and bitcoin address.

If you have the android client. if you have a blockchain.info account. You DON'T have your public key.

Is there a way to build a multi sig with BITCOIN ADDRESSES only? (or at least ONE public key from one person (me) and a the bitcoin address of someone else?)

is there a way to CALCULATE the PUBLIC KEY (PUBKEY) from the Bitcoin Address?

Please help!

Topic: MultiSig BUT with Bitcoin Addresses NOT Public Keys - page 2. (Read 3086 times)