Sync BEP2 and BEP20 Token Supply

Prerequisite

This BEP20 token is mirrored to a BEP2 token.

Motivation

For a BEP20 token which has been mirrored to BC, anyone can call the sync method to balance the total supply on BC and BSC. Thus, the total supply among two Blockchains will remain the same.

What happens under the hood

• Verify there is already mirrored
• Check the total supply and token symbol is valid
• Send a cross-chain package to modify a BEP2 token total supply on BNB Beacon Chain

After syncing, the total supply on BC and BSC are the same.

Fee Table

Fee Name	Pay in BNB
syncFee	it's 0.002BNB on mainnet now
relayFee	it's 0.002BNB on mainnet now

Both syncFee and relayFee can be changed by on-chain governance

To query syncFee from system contract;

• Call Tokenmanager Contract with the latest ABI

• Query syncFee function

Fee= result/1e18

To query relayFee from system contract;

• Call TokenHub Contract with the latest ABI

• Query getMiniRelayFee function

Fee= result/1e18

Mirror With MyEtherWallet

• Call Tokenmanager Contract

Use the latest ABI

• Select sync function and fill-in with your BEP20 address

The value here should be no less than syncFee+ relayFee.

Time stamp should be greater than unix_timestamp(now()). The difference should be between 120 and 86400. It's recommended to use unix_timestamp(now())+1000

All set!