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tempdir crate has been deprecated; use tempfile instead

The tempdir crate has been deprecated
and the functionality is merged into tempfile.

See advisory page for additional details.

https://github.com/cosmos/cosmos-sdk/blob/master/docs/architecture/adr-036-arbitrary-signature.md

cosmos clients are divided into 3 categories(different port)

design the main api facade for handling different port

the gRPC server (default port: 9090),
the REST server (default port: 1317),
the Tendermint RPC endpoint (default port: 26657)

log and env_logger could be used.

gcc link error

add an example for chainmain

1. make wallet
2. sign tx
3. broadcast tx

it's a dependency of CosmRS:
https://github.com/RustCrypto/elliptic-curves/tree/master/k256#%EF%B8%8F-security-warning

it's used in some production software, e.g. Hermes: https://github.com/informalsystems/ibc-rs/blob/e793e28a6da160c2439b929826580b6681397b97/relayer/Cargo.toml#L44

• the implementation uses https://www.microsoft.com/en-us/research/wp-content/uploads/2016/06/complete-2.pdf .

We could possibly investigate switching to https://github.com/rust-bitcoin/rust-secp256k1

We can investigate the use of https://rust-diplomat.github.io/book/intro.html
which supports C++, C and JS... before switching to it from CXX and wasm-bindgen, it'll probably be good to document the consequences in ADR

create basic cargo project

refer to

https://github.com/cosmos/cosmos-rust/tree/main/cosmrs
https://github.com/forbole/cosmos-rust-wallet

1. write bindings for webassembly
2. add sample nodejs program which uses web-assembly

add multi-sig

cosmos-rust MsgDelegate struct: https://github.com/cosmos/cosmos-rust/blob/main/cosmrs/src/staking.rs#L9

crypto.org protocol: https://crypto.org/docs/resources/cosmos-grpc-docs.html#msgdelegate

add multi-signature tx

add api for wallet verification
whether specific address is truly belongs to the user
after that, user can fetch his NFT from server

to prevent replay attack, input should be random or given by the server.
refer to related ethereum NFT protocols

check diplotmat(rust) for c binding and check in unity3d
or other productive way to support unity3d

add basic python bindings
useful for testing bindings

ref:
https://github.com/PyO3/pyo3

there are some breaking changes:
https://github.com/mozilla/uniffi-rs/blob/main/CHANGELOG.md#v0160---2021-12-15

add NFT minting

write basic binding in C

1. write rust framework
2. export C binding automatically
3. write sample C which use that binding

create cronos rpc client facade (8545 port)
wrap ethermint tx broadcasting

add binding for dart
which can be used in flutter

add interface for multiple chain
chainmain
cronos
etc

signing + verification as per
https://eips.ethereum.org/EIPS/eip-4361

create cosmos rpc client facade
wrap cosmos tx broadcasting through 9090 grpc port

write an example for NFT creation, minting
in cpp example

in c++14

add NFT creation in chainmain

add ibc tx

add tx broadcast in cpp example
refer to javascript

add wallet management
should handle these key types, also can be extendible.

cosmos secp256k1
eth secp256k1

use bech32, eth address

Add automatic code generation and compilation scripts for Android, IOS, and wasm.

add cpp binding via cxx.rs

add nft api

Android build takes from 30 to 60 minutes: https://github.com/crypto-com/defi-wallet-core-rs/actions/workflows/android-build.yml
iOS build takes about 15 minutes: https://github.com/crypto-com/defi-wallet-core-rs/actions/workflows/ios-build.yml

there are currently a few obvious optimisations that could dramatically reduce this time:

1. there's no need to run cargo build... in the whole workspace -- Android and iOS only need the defi-wallet-core-common crate to be built... so running cargo build -p defi-wallet-core-common ... will speed up things
2. there are some repeated steps that download or build the same dependencies, e.g. openssl, uniffi_bindgen... these can be cached: https://docs.github.com/en/actions/advanced-guides/caching-dependencies-to-speed-up-workflows

https://github.com/crypto-com/defi-wallet-core-rs/actions/runs/1580505913

add basic tx
sending amount with specific denom

pub fn get_default_address(&self, coin: WalletCoin) -> Result<String, HdWrapError> {

only returns index=0

add this api to wallet
pub fn get_address(&self, coin: WalletCoin,index:i32) -> Result<String, HdWrapError> {