Cross-chain

These guides cover an asset that is active on satellite chains: opening a satellite, moving positions to it and back, transferring there, and operating the validations that authorize those transfers. In every one of them the reference chain decides and the satellite executes.

Order	ID	Guide	What it does	Who
1	33	Open an asset on a satellite	Sets the route, the peer and the windows for one satellite.	Issuer
2	30	Delegate a position out to a satellite	Makes a holder's position active on a satellite, for the same owner.	Investor
3	31	Transfer on a satellite	Authorizes, executes and settles a transfer out of a satellite wallet.	Investor
4	34	Transfer between two satellites	The same, when the recipient is on another satellite: two reports.	Investor
5	32	Recall a position to the reference chain	Returns a position to the reference chain, for the same owner.	Investor, or Token Agent
6	35	Discard or resolve a validation	Releases the reservation of a validation that will not settle.	Validation Keeper
7	36	Handle a late reconciliation or a halt	Responds to the alarms of the cross-chain layer and resumes operation.	Issuer

The "Order" column follows the life of a position on a satellite, then the operations around it. The "ID" column is the permanent reference number of each guide. See How guides are numbered.

Three things to know before reading them.

• What is described on the satellite side. These guides give the calls on the reference chain in full. On a satellite, they state what T-REX Lite does and what it checks. Its interface is covered under Build: Implement T-REX Lite on a new chain.

• Which movement to use. A delegation-out and a recall move a position between the reference chain and a satellite for one owner. A transfer changes the owner, and always starts from a wallet on a satellite. See Movement types.

• Where the concepts are. The validation is explained in Authorization before execution, and its states in The dual-state lifecycle.