ISO/IEC 18014-3:2009

Information technology — Security techniques — Time-stamping services — Part 3: Mechanisms producing linked tokens

describes a general model for time-stamping services producing linked tokens,
describes the basic components used to construct a time-stamping service producing linked tokens,
defines the data structures used to interact with a time-stamping service producing linked tokens,
describes specific instances of time-stamping services producing linked tokens, and

defines a protocol to be utilized by time-stamping services producing linked tokens for the purpose of extending linked tokens to published values.