Blockchain & Web3 Development Company in San Francisco

Where you land depends on which of these you commission: a DeFi MVP, RWA tokenization platform, NFT marketplace, or wallet with account abstraction, or a custom L1, app chain on Cosmos SDK or OP Stack, or institutional-grade settlement and custody rail. Scope drivers include custody hooks, oracle integration, OFAC screening, and the first audit pass. SF blockchain budgets cluster in those three bands. A production-grade smart contract audit with a top-tier firm (Trail of Bits, OpenZeppelin, Certora, Zellic, Spearbit via Cantina) lands USD 30,000 to USD 150,000 depending on contract complexity, lines of Solidity or Rust reviewed, and whether formal verification is in scope. We quote in USD, fixed-fee against a signed statement of work.

The SEC applies the Howey Test (an investment of money, in a common enterprise, with an expectation of profit, derived from the efforts of others) to determine whether a token is a security. SF founders shipping tokens face the most aggressive SEC enforcement posture in the world, with prior actions against LBRY, Telegram, Kik, and the ongoing Coinbase, Ripple, and Binance cases shaping the live precedent. We design tokens around the SEC's enforcement signals, document utility and decentralization milestones for the Hinman framework, and produce the technical evidence (contract immutability, governance distribution, validator decentralization) your securities counsel uses to argue against security classification. We do not give legal advice, but we deliver the operational record Cooley, Fenwick, Latham, or Wilson Sonsini will rely on.

If your platform serves any New York-resident users, the answer is almost always yes. The New York Department of Financial Services BitLicense (23 NYCRR Part 200) covers virtual currency business activity, and the NY Attorney General has aggressively pursued non-licensed platforms that take East Coast users. SF founders typically deal with the BitLicense the moment they grow past a friends-and-family Bay Area user base. We build the geofencing, IP and wallet address screening, and KYC tiering needed to either block New York users cleanly or operate under a BitLicense affiliate. We coordinate with NY counsel (Lowenstein, Davis Polk, Sullivan Cromwell) on the application package, including system descriptions, custody architecture, and cyber program documentation.

California SB 39, the Digital Financial Assets Law, was signed by Governor Newsom in October 2023 and takes effect July 1, 2025. It creates a licensing regime under the California Department of Financial Protection and Innovation (DFPI) for digital financial asset business activity in the state, with capital, custody, disclosure, and consumer protection obligations that parallel the NY BitLicense framework. SF and broader California crypto platforms need to either qualify for an exemption, register for the new license, or restructure operations before the effective date. We help map your platform against the SB 39 scope, design custody architecture that meets the DFPI requirements, and prepare technical and operational evidence for your DFPI application package alongside your securities counsel.

California's Money Transmission Act applies to anyone receiving money or monetary value for transmission to a third party, which generally captures fiat on-ramp and off-ramp activity. The DFPI has taken the position that certain crypto activities (custodial wallets, custodial exchanges, certain stablecoin issuance) require a California Money Transmitter License unless an exemption applies. After SB 39 takes effect in July 2025, the DFPI is also the regulator for digital financial assets activity, so the regulatory overlap is real. We work with your money transmission counsel (Lewis Brisbois, BCLP, Cooley) to scope the license requirement, build the operational controls (BSA program, surety bond support, capital adequacy) and the technical evidence DFPI examiners ask for during licensing and examination.

We coordinate audits with Trail of Bits (deep cryptography and bridge work), OpenZeppelin (EVM and governance-heavy protocols), Certora (formal verification on critical invariants), Zellic (Solana and EVM), Spearbit via Cantina (competitive review across firms), Halborn (bridges and cross-chain), and OtterSec (Solana and Move). Every SF engagement runs a pre-audit internal review with Slither, Mythril, and Foundry-based invariant testing, applies formal verification on the highest-risk invariants where the protocol economics warrant it, and includes a remediation sprint before the public audit report is published. For institutional plays we coordinate a follow-up bug bounty on Immunefi at launch.

OFAC compliance is non-negotiable for any US-touching crypto platform. We wire Chainalysis Reactor or TRM Labs at multiple choke points: wallet creation (KYC plus address screening), deposit and withdrawal, and on-chain interactions through covered counterparties. The Tornado Cash precedent makes block-list discipline a board-level issue, so we build the audit trail your compliance officer can defend in front of FinCEN and OFAC examiners. For the FinCEN travel rule we implement TRP, IVMS 101 messaging, or Notabene integrations depending on counterparty mix. SAR reporting pipelines flow into your compliance officer's case management system (Hummingbird, Unit21, or in-house).

A focused DeFi MVP (AMM, lending market, vault, or RWA tokenization) ships in fourteen to twenty-two weeks from kickoff to mainnet, assuming standard Solidity and a single L2 target. Week 1 to 3 is regulatory discovery and protocol design. Week 4 to 12 is contract engineering, invariant testing in Foundry, and pre-audit hardening. Week 13 to 16 is the third-party audit and remediation sprint. Week 17 to 22 is testnet deployment, governance bootstrap, oracle and custody integration, and the controlled mainnet launch. Cross-chain protocols, app chains on OP Stack or Cosmos SDK, and institutional custody integrations add four to eight weeks. We coordinate with your securities counsel, audit firm, and custody partner so the launch sequence does not slip on regulatory dependencies.