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一. 什么是 COSMOSusdt钱包

严格来说，COSMOS 是一个独立并行区块链的分散网络，每个区块链都由BFT共识算法（如Tendermint共识）提供支持。

换句话说，COSMOS 是一个新的区块链生态系统，可以相互扩展和互操作。 在 COSMOS 之前，区块链是孤立的，无法相互沟通。 它们很难构建，每秒只能处理少量事务。 COSMOS 通过新的技术愿景解决了这些问题。

二. COSMOS 相关资料

参考原文

三. COSMOS 节点搭建

四. COSMOS 钱包开发

1.生成地址和私钥

1.1. python 生成地址和私钥

import?hashlib from?secp256k1?import?PrivateKey import?bech32

def?generate_wallet(): ????privkey?=?PrivateKey().serialize() ????return?{ ????????"private_key":?privkey, ????????"public_key":?privkey_to_pubkey(privkey), ????????"address":?privkey_to_address(privkey), ????}

def?privkey_to_pubkey(privkey:?str)?->?str: ????privkey_obj?=?PrivateKey(bytes.fromhex(privkey)) ????return?privkey_obj.pubkey.serialize().hex()

def?pubkey_to_address(pubkey:?str)?->?str: ????pubkey_bytes?=?bytes.fromhex(pubkey) ????s?=?hashlib.new("sha256",?pubkey_bytes).digest() ????r?=?hashlib.new("ripemd160",?s).digest() ????return?bech32.bech32_encode("cosmos",?bech32.convertbits(r,?8,?5))

def?privkey_to_address(privkey:?str)?->?str: ????pubkey?=?privkey_to_pubkey(privkey) ????return?pubkey_to_address(pubkey)

wallet?=?generate_wallet() print(wallet)

执行结果如下：

{'private_key':?'bfbc2e98d50325b8783bb8c2188d1a92aa7d0fbec9feec304a9eb887115c354f',?'public_key':?'020a6be4ed72a3317bc8d148a2604a2b31c2d2c07405cacfcd175b68b9445ce42e',?'address':?'cosmos1zmja29jn8cqcf59yy968ze3tdet2zyl6gxh4e8'}

1.2. python 交易签名

import?base64 import?json from?secp256k1?import?PrivateKey from?address?import?privkey_to_address,?privkey_to_pubkey

class?Transaction: ????def?__init__(self,?*,?privkey:?str,?account_num:int,?sequence:int,?fee:int,?gas:int,?memo:str?=?"",?chain_id:?str?=?"cosmoshub-2",sync_mode?=?"sync"): ????????self.privkey?=?privkey ????????self.account_num?=?account_num ????????self.sequence?=?sequence ????????self.fee?=?fee ????????self.gas?=?gas ????????self.memo?=?memo ????????self.chain_id?=?chain_id ????????self.sync_mode?=?sync_mode ????????self.msgs?=?[] ????def?add_atom_transfer(self,?recipient:?str,?amount:?int)?->?None: ????????self.msgs.append( ????????????{ ????????????????"type":?"cosmos-sdk/MsgSend", ????????????????"value":?{ ????????????????????"from_address":?privkey_to_address(self.privkey), ????????????????????"to_address":?recipient, ????????????????????"amount":?[{"denom":?"uatom",?"amount":?str(amount)}], ????????????????}, ????????????} ????????)

def?_get_sign_message(self): ????????return?{ ????????????"chain_id":?self.chain_id, ????????????"account_number":?str(self.account_num), ????????????"fee":?{"gas":?str(self.gas),?"amount":?[{"amount":?str(self.fee),?"denom":?"uatom"}]}, ????????????"memo":?self.memo, ????????????"sequence":?str(self.sequence), ????????????"msgs":?self.msgs, ????????}

def?_sign(self)?->?str: ????????message_str?=?json.dumps(self._get_sign_message(),?separators=(",",?":"),?sort_keys=True) ????????message_bytes?=?message_str.encode("utf-8") ????????privkey?=?PrivateKey(bytes.fromhex(self.privkey)) ????????signature?=?privkey.ecdsa_sign(message_bytes) ????????signature_compact?=?privkey.ecdsa_serialize_compact(signature) ????????signature_base64_str?=?base64.b64encode(signature_compact).decode("utf-8") ????????return?signature_base64_str

def?get_pushable_tx(self)?->?str: ????????pubkey?=?privkey_to_pubkey(self.privkey) ????????base64_pubkey?=?base64.b64encode(bytes.fromhex(pubkey)).decode("utf-8") ????????pushable_tx?=?{ ????????????"tx":?{ ????????????????"msg":?self.msgs, ????????????????"fee":?{ ????????????????????"gas":?str(self.gas), ????????????????????"amount":?[{"denom":?"uatom",?"amount":?str(self.fee)}], ????????????????}, ????????????????"memo":?self.memo, ????????????????"signatures":?[ ????????????????????{ ????????????????????????"signature":?self._sign(), ????????????????????????"pub_key":?{"type":?"tendermint/PubKeySecp256k1",?"value":?base64_pubkey}, ????????????????????????"account_number":?str(self.account_num), ????????????????????????"sequence":?str(self.sequence), ????????????????????} ????????????????], ????????????}, ????????????"mode":?self.sync_mode, ????????} ????????return?json.dumps(pushable_tx,?separators=(",",?":"))

tx?=?Transaction( ????privkey="26d167d549a4b2b66f766b0d3f2bdbe1cd92708818c338ff453abde316a2bd59", ????account_num=11335, ????sequence=0, ????fee=1000, ????gas=37000, ????memo="", ????chain_id="cosmoshub-2", ????sync_mode="sync", )

tx.add_atom_transfer(recipient="cosmos103l758ps7403sd9c0y8j6hrfw4xyl70j4mmwkf",?amount=387000) pushable_tx?=?tx.get_pushable_tx() print(pushable_tx)

执行结果如下：

{"tx":{"msg":[{"type":"cosmos-sdk/MsgSend","value":{"from_address":"cosmos1lgharzgds89lpshr7q8kcmd2esnxkfpwvuz

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