An on-chain transfer agent is a regulated transfer agent that uses a blockchain to maintain the record of who owns a security. Each share or fund unit is represented by a token, and the agent controls the smart contract that issues, cancels and transfers those tokens. The blockchain record either serves as the official register or mirrors one kept in the agent's own systems. The role is central to tokenised securities.
The agent's duties do not change: it must know each holder's identity, process issues and redemptions, pay distributions and correct errors. On a public blockchain this is done by restricting tokens to approved wallet addresses through token allowlisting, and by retaining powers to freeze, reissue or force-transfer tokens when keys are lost or a court orders it. These powers, and any ability to upgrade the contract, need controls of the kind described under smart contract governance. The function supports on-chain fund administration.