Deploying a security token is the step where your legal structure becomes running code - and it must be done carefully, because the contract will hold real value and enforce real rules. The sequence is: choose a compliance-aware standard, configure the whitelist and transfer restrictions, get an independent audit, then deploy and verify. This is advanced work that assumes the legal wrapper is already sound. Here is the path at a high level.

Step 1: Choose the token standard

Use a compliance-aware standard, not a plain ERC-20. ERC-3643 and the ERC-1400 family bake eligibility checks and transfer restrictions into the token, which is exactly what a regulated security needs.

The choice depends on your requirements - identity-first enforcement, partitions, or specific features. The standards comparison covers the trade-offs; pick before you build, since it shapes the whole contract.

Step 2: Configure compliance rules

Set up the whitelist (identity registry) and the transfer rules the contract enforces: only approved, verified wallets can hold the token, and transfers to ineligible addresses are rejected. Connect it to your KYC process so approvals flow to the on-chain list.

This configuration is your on-chain compliance. Get it wrong and the token either blocks legitimate holders or admits ineligible ones - both serious. Test every rule against real scenarios.

Step 3: Audit before anything real

Before the contract touches real value, have it independently audited. The audit checks vulnerability classes and confirms the compliance logic enforces correctly - that the token truly cannot be transferred in ways that break the rules.

Never deploy an unaudited security token to production. Fix all findings, re-review, and only then proceed. This is non-negotiable, given the contract holds investor funds.

Step 4: Deploy and verify

Deploy to a testnet first and exercise the full flow - whitelisting, transfers, rejections, distributions. Only when it behaves correctly do you deploy to mainnet, verify the source code publicly, and record the addresses.

After deployment, re-audit after any change and monitor the contract. The investor experiences the result of this as whitelisting from the investor's side; your job is to make that enforcement correct and safe.

Where to go next

• Next: whitelisting & transfer restrictions in code.
• The investor's view: whitelisting from the investor's side.
• Glossary: ERC-3643.

Sources: token-standard specifications; audit-firm methodologies, as of 2026.