Switch 2: XMSS
XMSS is a hash-based post-quantum secure signature scheme. XMSS is used to sign PSC-BL and BR-BCT.
XMSS is a stateful signing method where every signature has a unique number. XMSS can only sign finitely many signatures.
Signature Counters
| XMSS Signature Counter | Used by |
|---|---|
| 496 | [19.0.0+] PSC-BL |
| 497 | [19.0.0+] BR-BCT |
| 1335 | [20.0.0+] PSC-BL |
| 1336 | [20.0.0+] BR-BCT |
| 1477 | [21.0.0+] PSC-BL |
| 1478 | [21.0.0+] BR-BCT |