cosmospy

Version 6.0.0

Tools for Cosmos wallet management and offline transaction signing

Table of Contents generated with mdformat-toc

• Installing
• Usage
  • Generating a wallet
  • Converter functions
    • Mnemonic seed to private key
    • Private key to public key
    • Public key to address
    • Private key to address
  • Signing transactions

Installing

Installing from PyPI repository (https://pypi.org/project/cosmospy):

pip install cosmospy

Usage

Generating a wallet

from cosmospy import generate_wallet

wallet = generate_wallet()

The value assigned to wallet will be a dictionary just like:

{
    "seed": "arch skill acquire abuse frown reject front second album pizza hill slogan guess random wonder benefit industry custom green ill moral daring glow elevator",
    "derivation_path": "m/44'/118'/0'/0/0",
    "private_key": b"\xbb\xec^\xf6\xdcg\xe6\xb5\x89\xed\x8cG\x05\x03\xdf0:\xc9\x8b \x85\x8a\x14\x12\xd7\xa6a\x01\xcd\xf8\x88\x93",
    "public_key": b"\x03h\x1d\xae\xa7\x9eO\x8e\xc5\xff\xa3sAw\xe6\xdd\xc9\xb8b\x06\x0eo\xc5a%z\xe3\xff\x1e\xd2\x8e5\xe7",
    "address": "cosmos1uuhna3psjqfxnw4msrfzsr0g08yuyfxeht0qfh",
}

Converter functions

Mnemonic seed to private key

from cosmospy import BIP32DerivationError, seed_to_privkey

seed = (
    "teach there dream chase fatigue abandon lava super senior artefact close upgrade"
)
try:
    privkey = seed_to_privkey(seed, path="m/44'/118'/0'/0/0")
except BIP32DerivationError:
    print("No valid private key in this derivation path!")

Private key to public key

from cosmospy import privkey_to_pubkey

privkey = bytes.fromhex(
    "6dcd05d7ac71e09d3cf7da666709ebd59362486ff9e99db0e8bc663570515afa"
)
pubkey = privkey_to_pubkey(privkey)

Public key to address

from cosmospy import pubkey_to_address

pubkey = bytes.fromhex(
    "03e8005aad74da5a053602f86e3151d4f3214937863a11299c960c28d3609c4775"
)
addr = pubkey_to_address(pubkey)

Private key to address

from cosmospy import privkey_to_address

privkey = bytes.fromhex(
    "6dcd05d7ac71e09d3cf7da666709ebd59362486ff9e99db0e8bc663570515afa"
)
addr = privkey_to_address(privkey)

Signing transactions

from cosmospy import Transaction

tx = Transaction(
    privkey=bytes.fromhex(
        "26d167d549a4b2b66f766b0d3f2bdbe1cd92708818c338ff453abde316a2bd59"
    ),
    account_num=11335,
    sequence=0,
    fee=1000,
    gas=70000,
    memo="",
    chain_id="cosmoshub-4",
    sync_mode="sync",
)
tx.add_transfer(
    recipient="cosmos103l758ps7403sd9c0y8j6hrfw4xyl70j4mmwkf", amount=387000
)
tx.add_transfer(recipient="cosmos1lzumfk6xvwf9k9rk72mqtztv867xyem393um48", amount=123)


# Submit the transaction
rpc_url = "https://rpc.cosmos.network/"

# Method 1
r = tx.broadcast(url=rpc_url)

# Method 2
import requests

pushable_tx = tx.get_pushable()
r = requests.post(rpc_url, data=pushable_tx)

One or more token transfers can be added to a transaction by calling the add_transfer method.

When the transaction is fully prepared, calling get_pushable will return a signed transaction in the form of a JSON string. This can be used as request body when calling the POST /txs endpoint of the Cosmos REST API.