Brevis + EigenLayer

Run as an Operator

1. The brevis binary and brevis.toml are required to run as an operator. The brevis binary should be run under Linux AMD64 system. It can also be built from source with command: go build -o brevis
2. Make sure the total stake > 0.01 eth in Eigen Layer, we support same strategies as Eigen DA
3. Add bls and ecdsa key of Eigenlayer info to the brevis.toml config file, both are required to join Brevis. Also recommend to change ethereum gateway RPC in the config file to a private one
4. Run brevis join --chainid 1 --quorums 0x01 cmd to opt-in Brevis AVS
5. Add operator id printed by last brevis join command (bytes32 hex string) to config file, note it's NOT your ETH addr
6. (optional but recommended): Remove ecdsa key info from config file as it's not needed for normal operation. only bls key is needed
7. Operator runs brevis run cmd which monitors Brevis contract for new requests, and signs w/ BLS key, then posts to Brevis gateway. Brevis operator process by default uses port 8081 to accept imcoming requests, such as health check. If the port already has been used by other process, please run the cmd with --port param to specify another one
8. Operator can monitor the process alive by checking api: GET /eigen/node/health, http status 200 means OK

Suggested hardware configuration: AWS C5/C6 2x large equivalent, 500GB disk.

Contact Brevis team for any issue or questions.

Run the binary as a systemd service (optional but recommended)

It is strongly advised to execute the binary in the context of a systemd service, enabling it to operate as a background process or daemon. This configuration ensures that the binary initiates automatically upon system startup or reboot.

1. Make sure to have followed step 1 to 5 from the Run as an Operator section
2. Create a new systemd service file using your preferred text editor. For example, using vim:

sudo vim /etc/systemd/system/brevis.service

3. Add the following content to the brevis.service file. If necessary, adjust the ExecStart and WorkingDirectory paths as well as the User and Group.

[Unit]
Description=Brevis Service
After=network.target

[Service]
User=ubuntu
Group=ubuntu
WorkingDirectory=/home/ubuntu/brevis-avs
ExecStart=/home/ubuntu/brevis-avs/brevis run
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target

4. Reload the systemd manager configuration to read your newly created service file:

sudo systemctl daemon-reload

5. Enable the service to start at boot:

 sudo systemctl enable brevis

6. Start the service immediately:

sudo systemctl start brevis

7. To check the status of your service:

sudo systemctl status brevis

8. To view the logs of your service:

journalctl -u brevis -f

Gateway Functions（Gateway is Run by Brevis Team）

• brevis gw cmd, needs a different config eg. gateway.toml
• accepts sig requests from eigenlayer operators, aggregate sigs, then send onchain
• accepts query requests from eigelayer operators, to query the original request data of a request ID
• accepts query requests from user, to query request ID and fee

How the Brevis AVS works

1. Dev App queries request ID and fee amount from Brevis Gateway for a set of slots, receipts, and transactions from a supported chain to be certified by Brevis AVS. Gateway retrieves the storage slot value, receipt log value, or raw tx data etc from chain RPC node, and generates the request ID, which is a hash of the data. Refer to API Prepare Query.
2. Dev App then sends a request with the request ID, required fee to the BrevisRequest contract. Refer to BrevisContract.sendRequest. In AVS mode, _callback and _option params are not taking effect.
3. Gateway monitors the request event emitted by the BrevisRequest contract, checks that the fee is sufficient, and updates the request status to FEE_PAID.
4. Brevis Operators respectively monitor the request event emitted by the BrevisRequest contract, retrieve the original request info from Brevis Gateway, and recalculate the request ID based on the data onchain. If the request ID matches, then operators respectively sign the request ID and send signature to Brevis Gateway.
5. The gateway aggregates the signatures after the aggregation task is done, then submits to BrevisEigen contract to check signatures. BrevisEigen will record the verification status. Refer to BrevisEigen contract.
6. The gateway calls BrevisRequest contract to fulfill the request. BrevisRequest will check with BrevisEigen contract if the request ID is verified, and store the request ID to BrevisProof contract.
7. Finally, the Brevis App can use the reqeust filled data (Refer to ExtractInfos), if the data hash is the same with the stored request ID in BrevisProof contract. Refer to BrevisApp for an abstract contract that can be inherited by Dev team.

Gateway API Reference

Endpoint

1. Holesky Testnet - https://testnet-api.brevis.network
2. Ethereum Mainnet - https://api.brevis.network

Prepare Query

To start a data usage process, the user sends PrepareQueryRequest to the gateway and receives PrepareQueryResponse

• POST /brvgw/prepareQuery
• Content-Type: application/json; charset=UTF-8

PrepareQueryRequest

Name	Type	Description
chain_id	uint64	the data from chain id
target_chain_id	uint64	the chain uses the data
receipt_query_infos	Array	list of receipts *optional
storage_query_infos	Array	list of storage slots *optional
transaction_query_infos	Array	list of txs *optional

ReceiptQueryInfo

Name	Type	Description
tx_hash	string	tx hash of the receipt
log_query_infos	Array	list of logs in the receipt

LogQueryInfo

Name	Type	Description
log_index	uint64	index of the log in the receipt, start from 0
is_value_from_topic	bool	true if the value is retrieved from log topic
value_index	uint64	index of the value in the log, splitted per each 32 bytes if the value is in the log data field

StorageQueryInfo

Name	Type	Description
blk_hash	string	from which block
account	string	address of the account to retrieve storage slot value from
slot	string	slot key

TransactionQueryInfo

Name	Type	Description
tx_hash	string	tx hash

PrepareQueryResponse

Name	Type	Description
query_hash	string	the generated request id
fee	string	fee, charge gas token in WEI

Deployment

Holesky Testnet

1. BrevisRequest - 0xe0A61C0CAa3D8DE34bE6D31Bc4429ff1D51893A8
2. BrevisProof - 0xFF71BA4db245F08c739492b67e65D77C5B04B325
3. BrevisEigen - 0x7A46219950d8a9bf2186549552DA35Bf6fb85b1F

Ethereum Mainnet

1. BrevisRequest - 0x63A825ADD2129410628a8561dDD059646FB49aB0
2. BrevisProof - 0x9E10764042A2168dE8B8Aab8E7862eF98E759F90
3. BrevisEigen - 0x9FC952BdCbB7Daca7d420fA55b942405B073A89d