Chain ID
A chain ID is a unique identifier that represents a blockchain network. We use it to distinguish different blockchain
networks from each other and to ensure that transactions and messages are sent to the correct network. Evmos network
follows the format of identifier_EIP155-version format.
Official Chain IDs
NOTE: The latest Chain ID (i.e highest Version Number) is the latest version of the software and mainnet. Also note, that the following upgrades technically did not require a Chain ID change:
evmos_9001-1->evmos_9001-2evmos_9000-3->evmos_9000-4
Mainnet
| Name | Chain ID | Identifier | EIP155 Number | Version Number | Active |
|---|---|---|---|---|---|
| Evmos 2 | evmos_9001-2 | evmos | 9001 | 2 | ✅ |
| Evmos 1 | evmos_9001-1 | evmos | 9001 | 1 | 🚫 |
Testnet
| Name | Chain ID | Identifier | EIP155 Number | Version Number | Active |
|---|---|---|---|---|---|
| Evmos Public Testnet | evmos_9000-4 | evmos | 9000 | 4 | ✅ |
| Evmos Public Testnet | evmos_9000-3 | evmos | 9000 | 3 | 🚫 |
| Olympus Mons Incentivized Testnet | evmos_9000-2 | evmos | 9000 | 2 | 🚫 |
| Arsia Mons Testnet | evmos_9000-1 | evmos | 9000 | 1 | 🚫 |
You can also lookup the EIP155 Chain ID by referring
to chainlist.org.
The Chain Identifier
Every chain must have a unique identifier or chain-id. Tendermint requires each application to
define its own chain-id in the genesis.json fields.
However, in order to comply with both EIP155 and Cosmos standard for chain upgrades, Evmos-compatible chains must implement
a special structure for their chain identifiers.
Structure
The Evmos Chain ID contains 3 main components
- Identifier: Unstructured string that defines the name of the application.
- EIP155 Number: Immutable EIP155
CHAIN_IDthat defines the replay attack protection number. - Version Number: Is the version number (always positive) that the chain is currently running. This number MUST be incremented every time the chain is upgraded or forked in order to avoid network or consensus errors.
Format
The format for specifying and Evmos compatible chain-id in genesis is the following:
{identifier}_{EIP155}-{version}
The following table provides an example where the second row corresponds to an upgrade from the first one:
| ChainID | Identifier | EIP155 Number | Version Number |
|---|---|---|---|
evmos_9000-1 | evmos | 9000 | 1 |
evmos_9000-2 | evmos | 9000 | 2 |
... | ... | ... | ... |
evmos_9000-N | evmos | 9000 | N |