Deterministic Order ID

How DLN order IDs are derived, including inputs and hash format.

An order placed onto DLN is identified by a deterministic keccak256 hash derived from an array of bytes that contains all the properties of the order. The array is designed to be cross-chain compatible, so the smart contracts residing on both EVM and Solana can easily reproduce it. The smart contracts implementing the DLN protocol usually accept all these properties as a single data struct and derive an orderId programmatically to guarantee the order with the proper orderId is being managed.

To get the deterministic orderId of the order, the array of bytes should contain its following properties:

Bytes	Bits	Field
8	64	Salt
1	8	Maker Src Address Size (!=0)
N	8*N	Maker Src Address
32	256	Give Chain Id
1	8	Give Token Address Size (!=0)
N	8*N	Give Token Address
32	256	Give Amount
32	256	Take Chain Id
1	8	Take Token Address Size (!=0)
N	8*N	Take Token Address
32	256	Take Amount
1	8	Receiver Dst Address Size (!=0)
N	8*N	Receiver Dst Address
1	8	Give Patch Authority Address Size (!=0)
N	8*N	Give Patch Authority Address
1	8	Order Authority Address Dst Size (!=0)
N	8*N	Order Authority Address Dst
1	8	Allowed Taker Dst Address Size
N	8*N	* Allowed Taker Address Dst
1	8	Allowed Cancel Beneficiary Src Address Size
N	8*N	* Allowed Cancel Beneficiary Address Src
1	8	Is Hook Presented 0x0 - Not, != 0x0 - Yes
32	256	* Hook Envelope Hash