%lang starknet
‍
from starkware.cairo.common.math import signed_div_rem
from starkware.cairo.common.math_cmp import RC_BOUND

@viewfunc sum(arr_len : felt, arr : felt*) -> (res : felt):
if arr_len == 0:
return (0)
end
‍
let (sum_of_rest) = sum(arr_len=arr_len - 1, arr=arr + 1)
return ([arr] + sum_of_rest)
end

VOYAGER

The window to Starknet

Voyager is a block explorer for Starknet, developed by Nethermind. It provides a window for anyone to interact with the most cutting edge ZK-rollup. With its clean and minimal UI, Voyager brings transparency and convenience to all Starknet trailblazers.

Explore Voyager

%lang starknet
‍
from starkware.cairo.common.math import signed_div_rem
from starkware.cairo.common.math_cmp import RC_BOUND

@viewfunc sum(arr_len : felt, arr : felt*) -> (res : felt):
if arr_len == 0:
return (0)
end
‍
let (sum_of_rest) = sum(arr_len=arr_len - 1, arr=arr + 1)
return ([arr] + sum_of_rest)
end

%lang starknet

from starkware.cairo.common.math import
signed_div_rem
from starkware.cairo.common.math_cmp
import RC_BOUND

@view
func sum(arr_len : felt, arr : felt*) ->
(res : felt):
if arr_len == 0:
return (0)

Explore Starknet with Voyager

Use the menu tabs to navigate the latest Starknet data, or type in any address, transaction, block, or message hash in Voyager’s search bar, and you'll be taken straight there.

Blocks

Shows latest blocks and their status, along with pending and accepted blocks.

Transactions

Shows transactions in reverse chronological order.

Contracts

Shows deployed contracts in reverse chronological order.

Classes

Shows declared classes in reverse chronological order.

Messages

Displays latest messages following the Starknet L1-L2 messaging protocol.

Events

Shows events emitted by contracts to notify applications about changes in their state.

Analytics

Displays transaction trends, contract and class growth over time, and Cairo 1 adoption statistics.

Network

Voyager allows browsing Starknet in Mainnet, Goerli testnet 1 and 2.

Contract view

The Contract view is packed with contract specific details. See its transactions, messages, events and get a rundown of the ERC20 tokens held in that contract. Since Starknet implements account abstraction by default, all accounts are smart contracts, and the contract view provides deep insight on those properties.

Contract view

Read contract view

In the tab Read contract, you can see and trigger the view functions of the contract, to check its state. With the Write Contract tab, our partnership with ArgentX wallet enables you to start transactions to trigger functions that change the contract's state.

Code section

In the Code section, Voyager displays the bytecode of that contract, and can also show the contract’s human-readable source code. In order to show the source code, Voyager provides the Contract Verification Tool, where anyone can upload the source code for a contract deployed to a specific address. Voyager compiles and verifies it against the on-chain bytecode and after that, the source code is available to read in the Code tab, with source code verification status at the top of the page.

Verifying a smart contract

Transaction view

The Transaction view provides deep insights into the anatomy of a transaction. Users land on the overview tab which provides essential information. Explore the transaction more in-depth by browsing to its internal calls, the included events or messages!

PS: Voyager comes with a slick dark-mode!

Transaction view

Tools for Starknet builders

Voyager is full of features for power users. The team is currently working on deeper integration with Starknet, partner collaborations and more advanced functionality. Check out our other Starknet tooling!

Juno Starknet Client

A Golang Starknet full-node client implementation.

Starknet Remix Plugin

A workspace for Starknet developers to write, compile, and deploy their code.

Cairo VM in Go

A virtual machine for Cairo written in Go.

Starknet Unity SDK

A toolkit for integrating Starknet functionalities into Unity projects.

Starknet.GO

A Go library for interacting with Starknet RPC.

Starkweb

SDK for front-end development on Starknet.

Tools for Starknet builders

Voyager is full of features for power users. The team is currently working on deeper integration with Starknet, partner collaborations and more advanced functionality. Check out our other Starknet tooling!

Juno Starknet Client

A Golang Starknet full-node client implementation.

Starknet Remix Plugin

A workspace for Starknet developers to write, compile, and deploy their code.

Cairo VM in Go

A virtual machine for Cairo written in Go.

Starknet Unity SDK

A toolkit for integrating Starknet functionalities into Unity projects.

Starknet.GO

A Go library for interacting with Starknet RPC.

Starkweb

SDK for front-end development on Starknet.

Building blocks for the decentralized future

Solutions
Blockchain-as-a-Service
New
Nethermind ResearchCryptography ResearchDeFi ResearchProtocol ResearchResearch SolutionsNethermind SecuritySmart Contract AuditsFormal VerificationZK AuditsBlockchain Core EngineeringInfrastructure ManagementdApps & Enterprise EngineeringBiometric IdentityAI Agents & Infrastructure
Tools
Nethermind ClientSedgeClearAuditAgentJuno ClientVoyagerStarkweb
Company
About UsInternship ProgramBlogOpen RolesEventsContact UsLegalNethermind Media KitCookies Policy
Community
Nethermind
NethermindStark
NethermindSec
LinkedIn
GitHub
Discord
YouTube

Nethermind © 2026