feat: apply view tag to reduce sync time

[thanhdanh]

Summary

One of the most common complaints around using Monero day-to-day is the time that it can take to sync up a wallet before being able to send Monero. As a solution to help reduce the synchronization time for Monero wallets, a researcher named UkoeHB came up with a novel approach – add a 1-byte “tag” to each transaction using a shared secret known only to the sender and receiver of that transaction.

Article: link

To apply view_tag:

• Download each block to get a list of transactions (
• Go through each transaction and get its view_tag if have (for all blocks that exist before the HF 16, no have view_tag filed in the transaction)
• Derive the view tag from the wallet account and then check with the tx's view_tag
• If the output's view tag does not match the derived view tag, the output should not belong to the account.

Depending on:

• mymonero-core-cpp
• monero-core-custom
• monero-asset

[feri42]

utACK