Add Canton Network POC

[pegvin]

Canton Transaction POC in JS and C/C++:

1. Create keypair at this derivation path from mnemonic: Derivation path: m/44’/6767’/0’/0’/0’ (use ed25519)
2. Derive partyId from public key
3. Run a local dev net using docker on your local machine. Ref: https://docs.dev.sync.glocbal/app_dev/testing/localnet.html
4. Allocate external party on participant node: Ref: https://docs.digitalasset.com/integrate/devnet/party-management/index.html. partyId needs to be allocated on participant node in order to be able to use the network.
   Steps:
   • Prepare txn in JS
   • Parse (proto deserialise) the prepared txn in C/C++
   • Validate, hash the proto serialized transactions (see multihashing from canton-wallet-sdk) and sign using the private key
5. Send/Tap some CC in your partyId
6. Implement Send from your account to some other account: Ref: https://docs.digitalasset.com/integrate/devnet/preparing-and-signing-transactions/index.html. Steps:
   • Prepare send txn in JS
   • Parse (proto deserialise) the prepared txn in C/C++
   • Validate and extract data to be displayed: sender, receiver, amount, expiry etc
   • Encode and hash the txn: Ref: https://docs.digitalasset.com/build/3.3/explanations/external-signing/external_signing_hashing_algorithm.html
   • Sign the txn hash using private key
7. Implement Accept choice on any pending txn: Ref: https://docs.digitalasset.com/integrate/devnet/token-standard/index.html#accepting-or-rejecting-a-2-step-transfer
   • Prepare Accept txn in JS
   • Rest steps same as Send: Show txn type as well.

General References:

1. https://docs.digitalasset.com/index.html
2. https://docs.dev.sync.global/app_dev/testing/localnet.html
3. https://github.com/hyperledger-labs/splice-wallet-kernel (Wallet SDK/Lib to be used, Can check source code for better understanding)
4. Protobuf docs: https://protobuf.dev/
5. Prepared Transaction (Send, Accept, Tap) Proto: https://github.com/hyperledger-labs/splice-wallet-kernel/blob/main/core/ledger-proto/src/_proto/com/daml/ledger/api/v2/interactive/interactive_submission_service.ts
6. Topology txn Proto: https://github.com/hyperledger-labs/splice-wallet-kernel/blob/main/core/ledger-proto/src/_proto/com/digitalasset/canton/topology/admin/v30/topology_manager_write_service.d.ts