# One shared bridge per chain

Pangea v4: how a coin launches today. Every new launch is a v4 launch. A v4 coin lives on up to six chains: Robinhood Chain, Base, Ethereum, BNB Chain (BSC), Solana and Elysium. The four EVM chains and Solana carry LayerZero and Hyperlane; Elysium carries Hyperlane only. This tab is all of v4: creating a coin, chains and pairs, fees and holder rewards, opening a chain later, handing over, launching from your own wallet, the Bundle Kit, bridging, contracts and the API. Coins launched before v4 are in the v3 and v2 tabs.

A v4 coin is not its own bridge. Each chain has one shared Pangea bridge that carries every v4 coin. The coin's token is a plain token that only that bridge mints and burns, and every message names the coin it carries by its coin id.

- Routes, verifier settings and delivery are set once per chain pair, for all v4 coins together. A new v4 launch sends no route-opening transactions, and no one pays a one-time route setup on a v4 coin's first transfer.
- The coin id is fixed at launch from the coin's chain list, its transport list and the routes of each listed chain and transport. The bridge refuses a message for a chain or a transport outside those lists, and no setting added later reaches a coin launched before it.
- The bridge, its transport adapters and the tokens cannot be changed after they are set. No admin function can mint, burn or move anyone's tokens.
- A pause stops only new sends. A message already sent can always be received: credited, or held and later released or refunded.
- Peers are chain-neutral 32-byte ids and the message carries the amount in shared decimals and the recipient as 32 bytes, so a chain of another kind can be added later without new EVM contracts.

## What a message can carry

- A plain transfer: tokens you hold, burned here and credited there.
- A buy and bridge: cash in, the coin bought from its pool on this chain and sent in the same transaction.
- A creator role update: the current creator wallets, copied from the coin's home chain to its other open chains.
- An open authorisation: the home chain's permission for a named wallet to open one listed chain.
- A refund: a held transfer sent back to the sender's chain, credited in full.

## Held transfers and refunds

- An arrival is held, never lost, when its chain is not open yet, when it would credit less than the recipient's minimum, or when a buy and bridge waits for Pangea's delivery to land it at the price.
- Anyone may release a held transfer once it can be credited. The recipient can also accept one held below its minimum now, at the current credit.
- A held transfer can be refunded to the sender's chain, credited there in full; whoever asks pays the return fee. The recipient may ask any time. A transfer held below its minimum: also its original sender, after 1 day. A transfer held for a chain still not open: anyone, after 1 day. Once the coin is open on that chain, or while the hold waits for Pangea's delivery: only the recipient.

> **Note:** v3 coins keep their own bridges: [The bridge price-gap fee →](https://www.pangea.trade/app/docs/v3#v3-gap-fee)

Part of the Pangea documentation, v4 tab: https://www.pangea.trade/app/docs.md