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Demos support use of the following Quantum safe signing algorithms for transaction and transmission signing:
  1. Falcon
  2. ML-DSA
You can sign transactions using Falcon by connecting your mnemonic as shown: 
import { Demos } from "@kynesyslabs/demosdk/websdk"

const demos = new Demos()
const mnemonic = demos.newMnemonic()
await demos.connectWallet(mnemonic, {
    algorithm: "falcon",
    dual_sign: true
})

const rawTx = {...}
const tx = await demos.sign(rawTx)

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PQC Identities

You can link your PQC identities to your ed25519 address on the Demos network, to allow you to only include the PQC signature on future transactions. 
import { Identities } from "@kynesyslabs/demosdk/abstraction"

const identities = new Identities()

// Bind every supported PQC algorithm to the connected ed25519 address.
const validityData = await identities.bindPqcIdentity(demos, "all")
const res = await demos.broadcast(validityData)

console.log(res)
You can also bind a specific subset of algorithms by passing a PQCAlgorithm[] array instead of "all": 
// Bind only Falcon, leaving ML-DSA unbound.
await identities.bindPqcIdentity(demos, ["falcon"])
For future wallet connections, you can connect your wallet without the dual_sign option. Transactions will not have the ed25519 signature and your ownership of the ed25519 address will be validated on the network.

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Removing PQC identities

To unbind PQC identities, use removePqcIdentity. It mirrors the binding shape — pass "all" to remove every algorithm, or a PQCAlgorithm[] to remove a subset. 
// Remove every PQC algorithm bound to the connected address.
const validityData = await identities.removePqcIdentity(demos, "all")
await demos.broadcast(validityData)

// Or remove just one algorithm.
await identities.removePqcIdentity(demos, ["falcon"])