8.1 KiB
Multisig
Learn how to generate, sign and broadcast a transaction using the keyring multisig {synopsis}
A multisig account is a Ethermint account with a special key that can require more than one signatures to sign transactions. This can be useful for increasing the security of the account or for requiring the consent of multiple parties to make transactions. Multisig accounts can be created by specifying:
- threshold number of signatures required
- the public keys involved in signing
To sign with a multisig account, the transaction must be signed individually by the different keys specified for the account. Then, the signatures will be combined into a multisignature which can be used to sign the transaction. If fewer than the threshold number of signatures needed are present, the resultant multisignature is considered invalid.
Generate a Multisig key
ethermintd keys add --multisig=name1,name2,name3[...] --multisig-threshold=K new_key_name
K is the minimum number of private keys that must have signed the transactions that carry the public key's address as signer.
The --multisig flag must contain the name of public keys that will be combined into a public key that will be generated and stored as new_key_name in the local database. All names supplied through --multisig must already exist in the local database.
Unless the flag --nosort is set, the order in which the keys are supplied on the command line does not matter, i.e. the following commands generate two identical keys:
ethermintd keys add --multisig=p1,p2,p3 --multisig-threshold=2 multisig_address
ethermintd keys add --multisig=p2,p3,p1 --multisig-threshold=2 multisig_address
Multisig addresses can also be generated on-the-fly and printed through the which command:
ethermintd keys show --multisig-threshold=K name1 name2 name3 [...]
Signing a transaction
Step 1: Create the multisig key
Let's assume that you have test1 and test2 want to make a multisig account with test3.
First import the public keys of test3 into your keyring.
ethermintd keys add \
test3 \
--pubkey=ethmpub1addwnpepqgcxazmq6wgt2j4rdfumsfwla0zfk8e5sws3p3zg5dkm9007hmfysxas0u2
Generate the multisig key with 2/3 threshold.
ethermintd keys add \
multi \
--multisig=test1,test2,test3 \
--multisig-threshold=2
You can see its address and details:
ethermintd keys show multi
- name: multi
type: multi
address: ethm1e0fx0q9meawrcq7fmma9x60gk35lpr4xk3884m
pubkey: ethmpub1ytql0csgqgfzd666axrjzq3mxw59ys6yqcd3ydjvhgs0uzs6kdk5fp4t73gmkl8t6y02yfq7tvfzd666axrjzq3sd69kp5usk492x6nehqjal67ynv0nfqapzrzy3gmdk27la0kjfqfzd666axrjzq6utqt639ka2j3xkncgk65dup06t297ccljmxhvhu3rmk92u3afjuyz9dg9
mnemonic: ""
threshold: 0
pubkeys: []
Let's add 10 PHOTON to the multisig wallet:
ethermintd tx send \
test1 \
ethm1e0fx0q9meawrcq7fmma9x60gk35lpr4xk3884m \
10000000000000000000aphoton \
--chain-id=ethermint_9000-1 \
--gas=auto \
--fees=1000000aphoton \
--broadcast-mode=block
Step 2: Create the multisig transaction
We want to send 5 PHOTON from our multisig account to ethm1rgjxswhuxhcrhmyxlval0qa70vxwvqn2e0srft.
ethermintd tx send \
ethm1rgjxswhuxhcrhmyxlval0qa70vxwvqn2e0srft \
ethm157g6rn6t6k5rl0dl57zha2wx72t633axqyvvwq \
5000000000000000000aphoton \
--gas=200000 \
--fees=1000000aphoton \
--chain-id=ethermint_9000-1 \
--generate-only > unsignedTx.json
The file unsignedTx.json contains the unsigned transaction encoded in JSON.
{
"body": {
"messages": [
{
"@type": "/cosmos.bank.v1beta1.MsgSend",
"from_address": "ethm1rgjxswhuxhcrhmyxlval0qa70vxwvqn2e0srft",
"to_address": "ethm157g6rn6t6k5rl0dl57zha2wx72t633axqyvvwq",
"amount": [
{
"denom": "aphoton",
"amount": "5000000000000000000"
}
]
}
],
"memo": "",
"timeout_height": "0",
"extension_options": [],
"non_critical_extension_options": []
},
"auth_info": {
"signer_infos": [],
"fee": {
"amount": [
{
"denom": "aphoton",
"amount": "1000000"
}
],
"gas_limit": "200000",
"payer": "",
"granter": ""
}
},
"signatures": []
}
Step 3: Sign individually
Sign with test1 and test2 and create individual signatures.
ethermintd tx sign \
unsignedTx.json \
--multisig=ethm1e0fx0q9meawrcq7fmma9x60gk35lpr4xk3884m \
--from=test1 \
--output-document=test1sig.json \
--chain-id=ethermint_9000-1
ethermintd tx sign \
unsignedTx.json \
--multisig=ethm1e0fx0q9meawrcq7fmma9x60gk35lpr4xk3884m \
--from=test2 \
--output-document=test2sig.json \
--chain-id=ethermint_9000-1
Step 4: Create multisignature
Combine signatures to sign transaction.
ethermintd tx multisign \
unsignedTx.json \
multi \
test1sig.json test2sig.json \
--output-document=signedTx.json \
--chain-id=ethermint_9000-1
The TX is now signed:
{
"body": {
"messages": [
{
"@type": "/cosmos.bank.v1beta1.MsgSend",
"from_address": "ethm1rgjxswhuxhcrhmyxlval0qa70vxwvqn2e0srft",
"to_address": "ethm157g6rn6t6k5rl0dl57zha2wx72t633axqyvvwq",
"amount": [
{
"denom": "aphoton",
"amount": "5000000000000000000"
}
]
}
],
"memo": "",
"timeout_height": "0",
"extension_options": [],
"non_critical_extension_options": []
},
"auth_info": {
"signer_infos": [
{
"public_key": {
"@type": "/cosmos.crypto.multisig.LegacyAminoPubKey",
"threshold": 2,
"public_keys": [
{
"@type": "/cosmos.crypto.secp256k1.PubKey",
"key": "ApCzSG8k7Tr4aM6e4OJRExN7cNtvH21L9azbh+uRrvt4"
},
{
"@type": "/cosmos.crypto.secp256k1.PubKey",
"key": "Ah91erz8ChNanqLe9ea948rvAiXMCRlR5Ka7EE/c0xUK"
},
{
"@type": "/cosmos.crypto.secp256k1.PubKey",
"key": "A0OjtIUCFJM3AobJ9HJTWKP9RZV2+WPcwVjLgsAidrZ/"
}
]
},
"mode_info": {
"multi": {
"bitarray": {
"extra_bits_stored": 3,
"elems": "wA=="
},
"mode_infos": [
{
"single": {
"mode": "SIGN_MODE_LEGACY_AMINO_JSON"
}
},
{
"single": {
"mode": "SIGN_MODE_LEGACY_AMINO_JSON"
}
}
]
}
},
"sequence": "1"
}
],
"fee": {
"amount": [
{
"denom": "aphoton",
"amount": "1000000"
}
],
"gas_limit": "200000",
"payer": "",
"granter": ""
}
},
"signatures": [
"CkCEeIbeGc+I1ipZuhp/0KhVNnWAv2tTlvgo5x61lzk1KHmLPV38m/YFurrFt5cm5+fqIXrn+FlOjrJuzBhw8ogYCkCawm9mpXsBHk0CFsE5618fVnvScEkfrzW0c2jCcjqV8EPuj3ut74UWzZyQkwtJGxUWtro9EgnGsB7Di1Gzizst"
]
}
Step 5: Broadcast transaction
ethermintd tx broadcast signedTx.json \
--chain-id=ethermint_9000-1 \
--broadcast-mode=block