nested.fi
Nested helps track crypto portfolios, balances, transactions, taxes, or DeFi positions.
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osec.io
OtterSec provides blockchain security audits and research. The firm audits Layer 1 foundations, wallets, DeFi protocols, bridges, and related infrastructure, and publishes past audits, findings, research notes, and team talks.
oxygen.org
Oxygen is a DeFi prime brokerage service built on Solana and powered by Serum's on-chain infrastructure. It lets users earn yield, borrow from peers, trade directly out of their pools and get trading leverage against a portfolio of assets. It uses multiple uses of the same collateral, cross-collateralization and order-book-based pricing.
quantstamp.com
Quantstamp is a blockchain security company that works on smart contracts, L1s and web infrastructure. It describes itself as a global leader in blockchain security and says it has worked with web3 projects.
rockawayx.com
RockawayX is a venture capital and infrastructure firm working with Web3 projects, offering capital, engineering and liquidity support. It runs blockchains via validators and provides on-chain liquidity to DeFi protocols. It operates its own data centers and develops hardware for network launches.
sherlock.xyz
Sherlock is a web3 security platform that combines private audits, audit contests, AI-assisted analysis and bug bounties. It describes an audit engine that coordinates AI security approaches into one validated result, and collaborative audits staffed by security researchers. The site states it has conducted over 1,000 audits and reports more than 11,000 security researchers.
sigmaprime.io
Sigma Prime performs blockchain security audits and research, auditing offchain code, ZK systems, blockchain infrastructure, and smart contracts. It also offers an embedded security engineer role, security training, and blockchain infrastructure operations, and publishes audit case studies.
softstack.io
Softstack is a Germany-based Web3 service partner offering smart contract audits, software development and consulting. Its services include smart contract auditing, penetration testing, dApp development and Web3 regulations consulting. The company presents itself as a service partner for software development, cybersecurity and consulting in Web3.
starkware.co
StarkWare develops STARK proof technology and core technology for the Starknet blockchain. The company states it was founded by co-inventors of STARKs. Its work covers scaling, privacy and quantum-resistant proofs, and the Cairo language for STARK-provable programs and Starknet smart contracts. STRK20 provides shielded balances and private transfers on Starknet.
statemind.io
Statemind is a blockchain security firm offering smart contract audits and security work, with stated expertise in Solidity and Vyper. Its audit process is described in five steps, from project review and code checks through interim reports and final verification.