Meta issue

[0xbok]

System design: https://excalidraw.com/#json=curpA9Oidkvos4QTQHqET,KHZ4Y8j9aN3HbSmJ6N-kyw

Send flow

• 1. GraphQL (GQL from here on) endpoint for users to initiate send (I (sender) want to send x eth to receiver) user_balance db #3.
• 2. Check user balance is enough user_balance db #3.
  • a. Create a SQL table user_bal: (address, balance)
  • b. Query that sender.balance >= x user_balance db #3 .
• 3. Find relevant leaves in state merkle tree: Given sender and x eth, find the leaves owner by sender in merkle tree that have total balance >= x eth.
• 4. Prepare message for sender authorization and reply to the GQL request with these messages.
• 5. Send API to receive the leaf, coin and receiver info along with signature from sender add pre-image table with merkle tree #5 update pmtree dependency to arcpay org #7.
• 6. validate signature, update merkle tree, fetch merkle proofs add proofs to queue message #8.
• 7. Enqueue all information in "send request queue" add proofs to queue message #8.
• 8. API receive an ACK from queue and returns promise to the caller.
• 9. Collect n messages from queue and batch prove them.
• 10. Validate these messages.
• 11. Update the state of a "proven merkle tree" after these n messages.
• 12. Create a transaction object and call an Owner to sign it.
• 13. Broadcast this tx on chain.

Mint flow

• watch mint events.
• update "state merkle tree".
• push event to queue.

Withdraw flow

• API
• Update merkle tree and send to queue.
• Consume the message, prove it, and update the proven merkle tree.

Proving remains a blocker.

[0xbok]