bundle property
OpenPGP-style ASCII-armored ciphertext of SealedPayloadV1. HPKE base mode,
X25519-HKDF-SHA256 KEM, ChaCha20-Poly1305 AEAD, info string
vta-sealed-transfer/v1. Recipient is the X25519 derivation of request.holder's
Ed25519 pubkey.
Implementation
final String bundle;