Special Operands

The following lists show the special operands supported by Beo instructions.

Table of Special Operands​

Name	Description
block.height	Returns height of the block within the finalize scope
self.signer	Returns the user address that originated the transition
self.caller	Returns the address of the immediate caller of the program
network.id	Returns the ID of the network on which the program is executed

Specification​

The following is the specification for each special operands in the Beo Virtual Machine (AVM).

network.id​

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Description​

Returns the ID of the network on which the program is executed. This can be useful for managing network-specific program behavior. The network.id command must be called within a finalize block.

Currently supported network IDs are:

• 0: Mainnet

• 1: Testnet

• 2: Canarynet

Example Usage​

assert.eq network.id 0u64;  // For mainnet

block.height​

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Description​

Returns the height of the block within the finalize scope. The block.height command must be called within a finalize block.

Example Usage​

assert.eq block.height 100u64;

self.signer​

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Description​

Returns the user address that originated the transition.

Example Usage​

assert.eq self.signer beo1...;

self.caller​

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Description​

Returns the address of the immediate caller of the program.

Example Usage​

assert.eq self.caller beo1...;