Custodian

See e.g. automated custodian.
"A custodian is a corporation or a trust, it could be something like a bank, and it has the legal requirement of owning an asset as a proxy for some other actor in the system. These things are all over the commercial world, they handle, goodness knows, billions or trillions of transactions a year, there are an unenumerated number of these things, and different jurisdictions handle them in very different ways. So the job of the custodian is to look to the digital world as if it’s a smart contract, and to the analogue world as if it’s a paper contract. So it’s basically the structural equivalent of the Ricardian contract."
"The Ricardian contract, as invented by Ian Grigg in 1996, is a method of recording a document as a contract at law, and linking it securely to other systems, such as accounting, for the contract as an issuance of value.[1][2] It is robust through use of identification by cryptographic hash function, transparent through use of readable text for legal prose and efficient through markup language to extract essential information.[3]"
Category:Agency