Quote from: buddhamangler on July 07, 2015, 03:17:24 AM

Does bitcoin have this? Obviously the math would differ in bitcoin possibly, i'm speaking only in the functionality. I would think this would be a good addition to multisignature...the idea of one key having more 'importance/relevance' than another with differing numbers of keys required based on their 'level'.

There isn't a single opcode to do it.

If you wanted one master key and 2 of 3 of the other keys, you could use the following scriptPubKey

Code:

OP_CHECKSIGVERIFY OP_2

OP_3 OP_CHECK OP_CHECKMULTISIG

To spend it, you use the following scriptSig

Code:

OP_0

The OP_CHECKSIGVERIFY checks the master sig and then the OP_CHECKMULTISIG checks the 2 out of 3 for the sub-signatures.

You can use OP_IF / OP_ELSE to have multiple options.

Code:

OP_IF OP_CHECKSIG OP_ELSE OP_2

OP_2 OP_CHECKMULTISIG OP_ENDIF

This means either you sign using the private key associated with pub-keyA or you can sign with the private key associated with (2 of 2) pub-keyB1 and pub-keyB2.