Dero Virtual machines documentation.
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DERO Virtual Machine (DVM)

DERO Virtual Machine represents entire DERO Smart Contracts eco-system which runs on the DERO block chain.


DVM is a decentralized platform that runs both public and private smart contracts: applications that run exactly as programmed without any possibility of downtime, censorship, fraud or third-party interference.Public Smart contracts are open versions. However, the DVM is being designed to support Private Smart Contracts where everything is hidden, eg parties, and information involved. Smart Contracts are nothing but rules which apply on transacting parties.

Current version of DVM is an interpretor based system to avoid security vulneribilities, issues and compiler backdoors. This also allows easy audits of Smart Contracts for quality,bug-testing and security assurances. DVM supports a new language DVM-BASIC.

DVM apps run on a from scratch custom built privacy supporting, encrypted blockchain, an enormously powerful shared global infrastructure that can move value around and represent the ownership of assets/property without leaking any information.No one knows who owns what and who transferred to whom.

  • This enables developers to create puzzles, games, voting, markets, store registries of debts or promises, move funds in accordance with instructions given long in the past (like a will or a futures contract) and many other ideas/things that have not been invented yet, all without a middleman or counterparty risk.

  • DVM-BASIC is a contract-oriented, high-level language for implementing smart contracts. It is influenced by GW-BASIC, Visual Basic and C and is designed to target the DERO Virtual Machine (DVM). It is very easy to program and very readable.

  • DVM runs Smart Contracts which are a collection of functions written in DVM-BASIC. These functions can be invoked over the blockchain to do something. SCs can act as libraries for other SCs.

  • DVM supports number of comments formats such as ‘, // , /* */ as good documentation is necessary.

Example Factorial program

' This is a comment
// This comment is supported
/* this is multi-line comment  */
// printf is not supported in latest DVM. Please comment or remove printf from all old Smart Contracts.
 Function Factorial(s Uint64) Uint64   // this is a commment
	10  DIM result,scopy as Uint64     /* this is also comment */
	15  LET scopy =  s
	20  LET result = 1
	30  LET result = result * s
	40  LET s = s - 1
	50  IF s >= 2 THEN GOTO 30
	//60  PRINTF "FACTORIAL of %d = %d" scopy result // printf is not supported in latest DVM.
	70  RETURN result
End Function

DVM are written in a DVM-BASIC custom BASIC style language with line numbers.

DVM supports uint64 and string data-types.

DVM interprets the smart-contract and processes the SC line-line

  • uint64 supports almost all operators namely +,-,*,/,%

  • uint64 support following bitwise operators & ,|, ^, ! , >> , <<

  • uint64 supports following logical operators >, >= , <, <=, == , !=

  • string supports only + operator. string support concatenation with a uint64.

  • string supports ==, != logical operators.

  • All DVM variables are mandatory to define and are initialized to default values namely 0 and “”.

A SC execution must return 0 to persist any changes made during execution. During execution, no panics should occur.