[AddToken] `USDtb` to `MAINNET`

### Network

MAINNET

### Token Symbol

USDtb

### Token Name

USDtb

### Decimals

18

### Address

0xC139190F447e929f090Edeb554D95AbB8b18aC1C

### Image URL

https://usdtb.money/shared/usdtb.svg

### Reason

USDtb is the first GENIUS compliant stablecoin and has $2B TVL, issued by Ethena Labs and Anchorage Digital and backed by BlackRock BUIDL.