Protocol-scoped and versioned, mirroring NArk's Arkade-Boltz-Preimage-v1
(SwapsManagementService.cs:128), so any Arkade SDK implementing this
scheme reproduces the same preimage and can recover an artifact another
SDK created. Deliberately distinct from the Boltz tag: a shared tag would
make one wallet key derive one preimage for both corridors.
Domain separator for the preimage derivation.
Protocol-scoped and versioned, mirroring NArk's
Arkade-Boltz-Preimage-v1(SwapsManagementService.cs:128), so any Arkade SDK implementing this scheme reproduces the same preimage and can recover an artifact another SDK created. Deliberately distinct from the Boltz tag: a shared tag would make one wallet key derive one preimage for both corridors.