Abstract: A multi-version database includes user-defined blockchain containers, where each of the user-defined blockchain containers is configured based on a type of data to be stored in a corresponding user-defined blockchain container. Each of the user-defined blockchain containers includes a set of one or more fields defined by a user. A command to write data to the multi-version database is received, where the command includes an identification of a first blockchain container of the user-defined blockchain containers, an identification of at least one of the set of one or more fields of the first blockchain container, and a value to write for at least one field of the set of one or more fields. A record is generated for the first blockchain container, the record including the value to write for the at least one field. A current state of the first blockchain container is then updated to include the record.

Abstract: A user relational blockchain database includes a set of system-defined user blockchains and user-defined blockchains. The set of system-defined user blockchains includes metadata for managing the user-defined blockchains. Each user-defined blockchain includes a set of fields defined by a user and at least some of the fields are relatable. A command is received to write data that includes an identification of a first user-defined blockchain, a field, and a value. A new block is generated that includes the value set for the field. The new block is transmitted to a network of servers for consensus to add to the first user-defined blockchain. The new block is persisted to the first user-defined blockchain. A command is received to read data from the user relational blockchain database that includes an identification of the first user-defined blockchain and an identification of a field. The value corresponding to the field is accessed and returned.