How to Create a Multisig Address

To receive payment you must first create a multisig payment address. This example shows a "2 of 3" address, however it can be generalized to any "m of n" scenario.

Create the Public Keys

From three random seeds, generate three private keys and corresponding public keys.

$ echo [user entropy] | bx ec-new | bx ec-to-public

6b3f9712911f3262fe72de340f0cbb8d (seed #1)
9d695afea1c3ab99e11248e4b74e698332b11f5c5c051e6e80da61aa19ae7c89 (private key #1)
02b66fcb1064d827094685264aaa90d0126861688932eafbd1d1a4ba149de3308b (public key #1)

$ echo [user entropy] | bx ec-new | bx ec-to-public

ca5167e564d813d6011ce02679a2c252 (seed #2)
68ebab45a918444d7e088c49bda76d7df89b9ea6ba5ddeb1aab5945391828b83 (private key #2)
025cab5e31095551582630f168280a38eb3a62b0b3e230b20f8807fc5463ccca3c (public key #2)

$ echo [user entropy] | bx ec-new | bx ec-to-public

d4ec97842cf63764ed261ea80f221a69 (seed #3)
d1a7069b6057195545d4d9048887dd22be97f16bf463c201b76f8bb05ed423ee (private key #3)
021098babedb3408e9ac2984adcf2a8e4c48e56a785065893f76d0fa0ff507f010 (public key #3)

Create the Multisig Address

Use the public keys to define the multisig redeem script and use it to create the script hash address. The "2" represents the number signatures required to spend money received at the address and the "3" represents the number of possible signatures.

$ bx script-to-address "2 [02b66fcb1064d827094685264aaa90d0126861688932eafbd1d1a4ba149de3308b] [025cab5e31095551582630f168280a38eb3a62b0b3e230b20f8807fc5463ccca3c] [021098babedb3408e9ac2984adcf2a8e4c48e56a785065893f76d0fa0ff507f010] 3 checkmultisig"

3A6oGpJ5MzABAj9PofXKjcpTJCgYrdGBNJ

This example is a continued in How to Spend From a Multisig Address.