Physics / mechanism
The supplied source base does not describe the cryptographic mechanism of post-quantum schemes. What it provides is a commercialisation frame for protocol-level cryptography generally: a research result at the protocol layer (the source names fair exchange, threshold signing and succinct proofs as the examples it tracks), attached to a settlement or trust problem, emerging from a laboratory that already has a commercialisation vehicle.
Within that frame, the operative parameter is not a physical one but an adoption one: whether an incumbent buyer already carries a budget line for the function being replaced. The source treats this as the variable that determines whether an applied-cryptography lineage converts into acquisitions rather than remaining a capital-absorbing infrastructure bet. Any assessment of post-quantum cryptography as a commercial category, as opposed to a standards or security question, would need to be tested against the same criterion.
Competitive landscape
The one comparison the sources support is between adjacent applied-cryptography sub-fields, not between post-quantum schemes themselves. Multi-party computation and threshold signing is described as the sub-field with the most repeatable exit path, because key custody is an existing budget line at payments companies; cited transactions include Unbound to Coinbase (January 2022), Sepior to Blockdaemon (2022), Sodot to MoonPay at approximately $100M all-stock (29 April 2026) and Fordefi to Paxos at over $100M. Zero-knowledge and succinct proofs is characterised as high capital with almost no M&A, with StarkWare at $261M, Irreducible at a $24M Series A and Cysic at $12M, and is to be underwritten as a token or infrastructure bet.
Post-quantum cryptography does not appear in that conversion table in the material supplied. Its position relative to the MPC and ZK lineages, in terms of whether it maps onto an existing incumbent budget line, is undetermined by the current source base.
Evidence base
- A sourcing map dated 21 July 2026 sets out the reproducible pattern for applied-cryptography spinouts: a protocol-level result plus a settlement or trust problem plus a lab with an existing commercialisation vehicle.
- The same pass identifies 4Mica as a KU Leuven COSIC / 3MI Labs spinout applying cryptography research to payment infrastructure, and treats 3MI Labs itself as a repeat-spinout vehicle worth monitoring as a channel.
- MPC and threshold signing is assessed as the highest-converting lineage, with buyers being payments companies; Sodot to MoonPay is dated 29 April 2026 at approximately $100M all-stock.
- ZK and succinct proofs is assessed as high capital with almost no M&A, evidenced by StarkWare $261M, Irreducible $24M Series A and Cysic $12M.
Frontier (open questions)
- Does post-quantum cryptography map onto an existing incumbent budget line in the sense used by the sourcing map, and if so which one (key custody, HSM refresh, TLS termination, or none of these)?
- Have any post-quantum lineages produced acquisitions by payments or custody incumbents on the scale of the MPC exits cited (approximately $100M and above), or does the category follow the ZK pattern of capital in without M&A out?
- Which academic laboratories with existing commercialisation vehicles are producing post-quantum spinouts, and does the 3MI Labs style repeat-vehicle model appear in this sub-field?
- What migration timelines are actually contracted by financial infrastructure buyers, as opposed to announced, and what fraction of deployments are hybrid rather than pure post-quantum?
Synthesised 2026-08-31 from 1 KB sources by the resynth pipeline; citations are KB source slugs.