Add signatory-only sign button to Bridge screen

Any of the USDT bridge multisig's 5 known signatories now sees a
status button on the Bridge screen: green when the automation key's
spending allowance is healthy, red with a Sign action once it drops
below threshold. Signing submits the renewal's as_multi approval
directly from the wallet, mirroring the same on-chain action already
available via pwap-web and pezbridge-sign.pex.mom - a third
independent channel for the same operation, none of which is a
single point of failure.

common/src/main/res/values/strings.xml

@@ -371,6 +371,12 @@
     <string name="bridge_hez_to_dot_blocked">HEZ→DOT swaps are temporarily unavailable. Please try again when DOT liquidity is sufficient.</string>
     <string name="bridge_wusdt_to_usdt_blocked">USDT(Pez)→USDT(Pol) swaps are temporarily unavailable. Waiting for 1:1 liquidity to be established.</string>
 
+    <string name="bridge_sign_status_ok">Bridge allowance OK (%s)</string>
+    <string name="bridge_sign_button">Sign renewal (%s)</string>
+    <string name="bridge_sign_waiting_others">Signed — waiting for other signers</string>
+    <string name="bridge_sign_in_progress">Signing…</string>
+    <string name="bridge_sign_error">Signing failed, tap to retry</string>
+
     <string name="wallet_asset_buy_sell">Buy/Sell</string>
 
 

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/domain/bridge/multisig/BridgeMultisigCalls.kt

@@ -0,0 +1,73 @@
+package io.novafoundation.nova.feature_assets.domain.bridge.multisig
+
+import io.novafoundation.nova.common.address.AccountIdKey
+import io.novafoundation.nova.common.data.network.runtime.binding.WeightV2
+import io.novafoundation.nova.common.utils.Modules
+import io.novafoundation.nova.common.utils.argumentType
+import io.novafoundation.nova.common.utils.composeCall
+import io.novafoundation.nova.feature_account_api.data.multisig.model.MultisigTimePoint
+import io.novafoundation.nova.runtime.util.constructAccountLookupInstance
+import io.novasama.substrate_sdk_android.runtime.RuntimeSnapshot
+import io.novasama.substrate_sdk_android.runtime.definitions.types.generics.GenericCall
+import io.novasama.substrate_sdk_android.runtime.metadata.call
+import java.math.BigInteger
+
+/**
+ * `Assets.approve_transfer(id, delegate, amount)` - field names verified against the actual
+ * pallet_assets source this ecosystem runs (bizinikiwi/pezframe/assets/src/lib.rs), not guessed:
+ * `pub fn approve_transfer(origin, id: T::AssetIdParameter, delegate: AccountIdLookupOf<T>,
+ * #[compact] amount: T::Balance)`. `delegate` is a lookup/MultiAddress field, so it goes through
+ * `constructAccountLookupInstance` - this chain uses non-standard numeric MultiAddress variant
+ * names in places (see runtime/util/AccountLookup.kt's own comment), so hand-rolling this
+ * wrapping instead of reusing the app's existing helper would be a real risk of a silently wrong
+ * encoding.
+ */
+fun RuntimeSnapshot.composeAssetsApproveTransfer(
+    assetId: Int,
+    delegate: AccountIdKey,
+    amount: BigInteger,
+): GenericCall.Instance {
+    val delegateType = metadata.module(Modules.ASSETS).call("approve_transfer").argumentType("delegate")
+
+    return composeCall(
+        moduleName = Modules.ASSETS,
+        callName = "approve_transfer",
+        arguments = mapOf(
+            "id" to assetId.toBigInteger(),
+            "delegate" to delegateType.constructAccountLookupInstance(delegate.value),
+            "amount" to amount,
+        )
+    )
+}
+
+/**
+ * `Multisig.as_multi(threshold, other_signatories, maybe_timepoint, call, max_weight)` - a plain
+ * threshold/signatory-list version of feature-account-api's `composeMultisigAsMulti`, which
+ * requires a full `MultisigMetaAccount` (only ever reads its `.threshold`/`.otherSignatories`,
+ * but constructing one would mean either building a throwaway implementation of the whole
+ * `MetaAccount` interface chain or going through this app's "add multisig wallet" import flow -
+ * neither is needed here since this screen's multisig is fully known/hardcoded ahead of time).
+ * Passing the full call (never just its hash) is always correct regardless of whether this
+ * signature is the first, an intermediate, or the final approval - pallet_multisig's own
+ * `operate()` only actually dispatches the call once threshold is reached with this vote,
+ * otherwise it just records the approval, so there is no "hash-only" branch needed on this side.
+ */
+fun RuntimeSnapshot.composeBridgeMultisigAsMulti(
+    threshold: Int,
+    otherSignatories: List<AccountIdKey>,
+    maybeTimePoint: MultisigTimePoint?,
+    call: GenericCall.Instance,
+    maxWeight: WeightV2,
+): GenericCall.Instance {
+    return composeCall(
+        moduleName = Modules.MULTISIG,
+        callName = "as_multi",
+        arguments = mapOf(
+            "threshold" to threshold.toBigInteger(),
+            "other_signatories" to otherSignatories.map { it.value },
+            "maybe_timepoint" to maybeTimePoint?.toEncodableInstance(),
+            "call" to call,
+            "max_weight" to maxWeight.toEncodableInstance(),
+        )
+    )
+}

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/domain/bridge/multisig/BridgeMultisigConstants.kt

@@ -0,0 +1,38 @@
+package io.novafoundation.nova.feature_assets.domain.bridge.multisig
+
+/**
+ * Everything needed to identify the USDT bridge's 3-of-5 multisig and let any of its 5 real
+ * signatories renew the automation key's spending allowance directly from this app's Bridge
+ * screen - a third independent channel alongside pwap-web's `/multisig/pending` and
+ * pezbridge-sign.pex.mom, all three ultimately doing the same on-chain thing (a signer's own
+ * wallet contributing one `Multisig.as_multi` approval), so none of them is a single point of
+ * failure for "how do signers actually sign."
+ *
+ * See res/validators-tiki.md "USDT Bridge Custody Multisig" (not in this repo) for how these
+ * were derived/verified on-chain.
+ */
+object BridgeMultisigConstants {
+
+    const val WUSDT_ASSET_ID = 1000
+
+    const val MULTISIG_ADDRESS = "5GvwxmCDp3PC33KHoeWSgj3S7ocE7nzk1jiCCZMPSDBFeNcj"
+    const val AUTOMATION_KEY_ADDRESS = "5GQu4PFUb1f3MTJ7i7c1CtLgDk3TVvpSW1VbQCRmfkMoC8cM"
+
+    const val THRESHOLD = 3
+
+    /** Renewal is offered once the remaining allowance drops below this (6 decimals). */
+    const val RENEWAL_THRESHOLD = 3_000_000_000L // 3,000 wUSDT
+
+    /** The standard amount a renewal tops the allowance back up to (6 decimals). */
+    const val TOPUP_AMOUNT = 10_000_000_000L // 10,000 wUSDT
+
+    data class Signatory(val role: String, val address: String)
+
+    val SIGNATORIES = listOf(
+        Signatory("Serok", "5EfUVZ4HXG65WuqeG24z4Pmt11cNQTUacR3CKymKcsv1UTFU"),
+        Signatory("SerokiMeclise", "5CrB5BWJfLNWEZAsAXDKXdJUGzFMXKvYnwRX4DVMcgBwxSdx"),
+        Signatory("Xezinedar", "5GipBJs2uNWTCazyZQ2vG3DEqLz4tXNmNZtBAT1Mtm1orZ5i"),
+        Signatory("Berdevk", "5HWFZbhkZuTUySXu6ZXYKrTHBnWXHvWRKLozE22zhnwXGGxk"),
+        Signatory("Noter", "5ELgySrX5ZyK7EWXjj6bAedyTCcTNWDANbiiipsT5gnpoCEp"),
+    )
+}

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/domain/bridge/multisig/BridgeMultisigInteractor.kt

@@ -0,0 +1,153 @@
+package io.novafoundation.nova.feature_assets.domain.bridge.multisig
+
+import io.novafoundation.nova.common.address.AccountIdKey
+import io.novafoundation.nova.common.address.intoKey
+import io.novafoundation.nova.common.address.toHexWithPrefix
+import io.novafoundation.nova.common.data.network.runtime.binding.WeightV2
+import io.novafoundation.nova.common.di.scope.FeatureScope
+import io.novafoundation.nova.common.utils.callHash
+import io.novafoundation.nova.feature_account_api.data.ethereum.transaction.TransactionOrigin
+import io.novafoundation.nova.feature_account_api.data.extrinsic.ExtrinsicService
+import io.novafoundation.nova.feature_account_api.data.extrinsic.execution.ExtrinsicExecutionResult
+import io.novafoundation.nova.feature_account_api.data.extrinsic.execution.requireOk
+import io.novafoundation.nova.feature_account_api.domain.interfaces.SelectedAccountUseCase
+import io.novafoundation.nova.feature_account_api.domain.model.accountIdIn
+import io.novafoundation.nova.feature_account_api.domain.multisig.intoCallHash
+import io.novafoundation.nova.runtime.di.REMOTE_STORAGE_SOURCE
+import io.novafoundation.nova.runtime.ext.ChainGeneses
+import io.novafoundation.nova.runtime.multiNetwork.ChainRegistry
+import io.novafoundation.nova.runtime.multiNetwork.chain.model.Chain
+import io.novafoundation.nova.runtime.multiNetwork.getRuntime
+import io.novafoundation.nova.runtime.storage.source.StorageDataSource
+import io.novasama.substrate_sdk_android.ss58.SS58Encoder.toAccountId
+import java.math.BigInteger
+import javax.inject.Inject
+import javax.inject.Named
+
+data class BridgeSignerState(
+    val signatoryRole: String,
+    val remainingAllowance: BigInteger,
+    val needsRenewal: Boolean,
+    val alreadySignedPendingRenewal: Boolean,
+    val approvalsSoFar: Int,
+)
+
+interface BridgeMultisigInteractor {
+
+    /** Null if the currently selected wallet isn't one of the 5 known bridge signatories - the
+     *  Bridge screen shows nothing in that case, this feature doesn't exist for anyone else. */
+    suspend fun getSignerState(): BridgeSignerState?
+
+    suspend fun submitRenewalSignature(): Result<ExtrinsicExecutionResult>
+}
+
+@FeatureScope
+class RealBridgeMultisigInteractor @Inject constructor(
+    private val chainRegistry: ChainRegistry,
+    private val selectedAccountUseCase: SelectedAccountUseCase,
+    @Named(REMOTE_STORAGE_SOURCE) private val storageDataSource: StorageDataSource,
+    private val extrinsicService: ExtrinsicService,
+) : BridgeMultisigInteractor {
+
+    override suspend fun getSignerState(): BridgeSignerState? {
+        val chain = chainRegistry.getChain(ChainGeneses.PEZKUWI_ASSET_HUB)
+        val metaAccount = selectedAccountUseCase.getSelectedMetaAccount()
+        val myAccountId = metaAccount.accountIdIn(chain)?.intoKey() ?: return null
+
+        val signatory = BridgeMultisigConstants.SIGNATORIES.firstOrNull {
+            it.address.toAccountId().intoKey() == myAccountId
+        } ?: return null
+
+        val remaining = queryRemainingAllowance(chain)
+        val needsRenewal = remaining < BigInteger.valueOf(BridgeMultisigConstants.RENEWAL_THRESHOLD)
+
+        var alreadySigned = false
+        var approvalsSoFar = 0
+        if (needsRenewal) {
+            val pending = queryPendingRenewal(chain)
+            if (pending != null) {
+                approvalsSoFar = pending.approvals.size
+                alreadySigned = pending.approvals.contains(myAccountId)
+            }
+        }
+
+        return BridgeSignerState(
+            signatoryRole = signatory.role,
+            remainingAllowance = remaining,
+            needsRenewal = needsRenewal,
+            alreadySignedPendingRenewal = alreadySigned,
+            approvalsSoFar = approvalsSoFar,
+        )
+    }
+
+    override suspend fun submitRenewalSignature(): Result<ExtrinsicExecutionResult> = runCatching {
+        val chain = chainRegistry.getChain(ChainGeneses.PEZKUWI_ASSET_HUB)
+        val metaAccount = selectedAccountUseCase.getSelectedMetaAccount()
+        val myAccountId = requireNotNull(metaAccount.accountIdIn(chain)?.intoKey()) {
+            "Selected account has no address on Pezkuwi Asset Hub"
+        }
+
+        val otherSignatories = BridgeMultisigConstants.SIGNATORIES
+            .map { it.address.toAccountId().intoKey() }
+            .filter { it != myAccountId }
+            .sortedBy { it.toHexWithPrefix() }
+
+        val pending = queryPendingRenewal(chain)
+        check(pending == null || !pending.approvals.contains(myAccountId)) {
+            "Already signed this renewal - waiting for other signers"
+        }
+
+        extrinsicService.submitExtrinsicAndAwaitExecution(
+            chain = chain,
+            origin = TransactionOrigin.WalletWithId(metaAccount.id)
+        ) {
+            val approveTransferCall = runtime.composeAssetsApproveTransfer(
+                assetId = BridgeMultisigConstants.WUSDT_ASSET_ID,
+                delegate = BridgeMultisigConstants.AUTOMATION_KEY_ADDRESS.toAccountId().intoKey(),
+                amount = BigInteger.valueOf(BridgeMultisigConstants.TOPUP_AMOUNT),
+            )
+
+            val multisigCall = runtime.composeBridgeMultisigAsMulti(
+                threshold = BridgeMultisigConstants.THRESHOLD,
+                otherSignatories = otherSignatories,
+                maybeTimePoint = pending?.timePoint,
+                call = approveTransferCall,
+                maxWeight = WeightV2(BigInteger.valueOf(1_000_000_000L), BigInteger.valueOf(200_000L)),
+            )
+
+            call(multisigCall)
+        }.requireOk()
+    }
+
+    private suspend fun queryRemainingAllowance(chain: Chain): BigInteger {
+        val multisigAccountId = BridgeMultisigConstants.MULTISIG_ADDRESS.toAccountId().intoKey()
+        val delegateAccountId = BridgeMultisigConstants.AUTOMATION_KEY_ADDRESS.toAccountId().intoKey()
+
+        return storageDataSource.query(chain.id) {
+            runtime.metadata.bridgeAssets().approvalAmount.query(
+                BridgeMultisigConstants.WUSDT_ASSET_ID.toBigInteger(),
+                multisigAccountId,
+                delegateAccountId,
+            )
+        } ?: BigInteger.ZERO
+    }
+
+    private suspend fun queryPendingRenewal(chain: Chain): BridgeOnChainMultisig? {
+        val multisigAccountId = BridgeMultisigConstants.MULTISIG_ADDRESS.toAccountId().intoKey()
+        val callHash = renewalCallHash(chain)
+
+        return storageDataSource.query(chain.id) {
+            runtime.metadata.bridgeMultisig().multisigs.query(multisigAccountId, callHash)
+        }
+    }
+
+    private suspend fun renewalCallHash(chain: Chain): AccountIdKey {
+        val runtime = chainRegistry.getRuntime(chain.id)
+        val call = runtime.composeAssetsApproveTransfer(
+            assetId = BridgeMultisigConstants.WUSDT_ASSET_ID,
+            delegate = BridgeMultisigConstants.AUTOMATION_KEY_ADDRESS.toAccountId().intoKey(),
+            amount = BigInteger.valueOf(BridgeMultisigConstants.TOPUP_AMOUNT),
+        )
+        return call.callHash(runtime).intoCallHash()
+    }
+}

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/domain/bridge/multisig/BridgeMultisigRuntimeApi.kt

@@ -0,0 +1,78 @@
+package io.novafoundation.nova.feature_assets.domain.bridge.multisig
+
+import io.novafoundation.nova.common.address.AccountIdKey
+import io.novafoundation.nova.common.data.network.runtime.binding.bindAccountIdKey
+import io.novafoundation.nova.common.data.network.runtime.binding.bindList
+import io.novafoundation.nova.common.data.network.runtime.binding.bindNumber
+import io.novafoundation.nova.common.data.network.runtime.binding.castToStruct
+import io.novafoundation.nova.common.utils.Modules
+import io.novafoundation.nova.feature_account_api.data.multisig.model.MultisigTimePoint
+import io.novafoundation.nova.feature_account_api.domain.multisig.CallHash
+import io.novafoundation.nova.runtime.storage.source.query.StorageQueryContext
+import io.novafoundation.nova.runtime.storage.source.query.api.QueryableModule
+import io.novafoundation.nova.runtime.storage.source.query.api.QueryableStorageEntry2
+import io.novafoundation.nova.runtime.storage.source.query.api.QueryableStorageEntry3
+import io.novafoundation.nova.runtime.storage.source.query.api.converters.scaleDecoder
+import io.novafoundation.nova.runtime.storage.source.query.api.converters.scaleEncoder
+import io.novafoundation.nova.runtime.storage.source.query.api.storage2
+import io.novafoundation.nova.runtime.storage.source.query.api.storage3
+import io.novasama.substrate_sdk_android.runtime.metadata.RuntimeMetadata
+import io.novasama.substrate_sdk_android.runtime.metadata.module.Module
+import java.math.BigInteger
+
+/**
+ * Minimal, Bridge-screen-local mirrors of the equivalents already used by the multisig-operations
+ * feature (feature-account-impl's `MultisigRuntimeApi`/`OnChainMultisig`) - duplicated here rather
+ * than imported because feature-assets depends on feature-account-api, not feature-account-impl
+ * (standard module-boundary convention in this app: features don't reach into each other's impl
+ * modules). Only what this screen actually needs is modeled.
+ */
+
+@JvmInline
+value class BridgeAssetsApi(override val module: Module) : QueryableModule
+
+context(StorageQueryContext)
+fun RuntimeMetadata.bridgeAssets(): BridgeAssetsApi = BridgeAssetsApi(module(Modules.ASSETS))
+
+/** `Assets.Approvals(asset_id, owner, delegate) -> Approval { amount, deposit }` - only `amount`
+ *  (the remaining spendable allowance) is needed here. */
+context(StorageQueryContext)
+val BridgeAssetsApi.approvalAmount: QueryableStorageEntry3<BigInteger, AccountIdKey, AccountIdKey, BigInteger>
+    get() = storage3(
+        name = "Approvals",
+        binding = { decoded, _, _, _ -> bindNumber(decoded.castToStruct()["amount"]) },
+        key2ToInternalConverter = AccountIdKey.scaleEncoder,
+        key3ToInternalConverter = AccountIdKey.scaleEncoder,
+        key2FromInternalConverter = AccountIdKey.scaleDecoder,
+        key3FromInternalConverter = AccountIdKey.scaleDecoder,
+    )
+
+@JvmInline
+value class BridgeMultisigApi(override val module: Module) : QueryableModule
+
+context(StorageQueryContext)
+fun RuntimeMetadata.bridgeMultisig(): BridgeMultisigApi = BridgeMultisigApi(module(Modules.MULTISIG))
+
+class BridgeOnChainMultisig(
+    val approvals: List<AccountIdKey>,
+    val timePoint: MultisigTimePoint,
+)
+
+/** `Multisig.Multisigs(multisig_account, call_hash) -> Multisig { approvals, when, ... }` -
+ *  mirrors `OnChainMultisig` but only carries what this screen needs (not deposit/depositor). */
+context(StorageQueryContext)
+val BridgeMultisigApi.multisigs: QueryableStorageEntry2<AccountIdKey, CallHash, BridgeOnChainMultisig>
+    get() = storage2(
+        name = "Multisigs",
+        binding = { decoded, _, _ ->
+            val struct = decoded.castToStruct()
+            BridgeOnChainMultisig(
+                approvals = bindList(struct["approvals"], ::bindAccountIdKey),
+                timePoint = MultisigTimePoint.bind(struct["when"]),
+            )
+        },
+        key1ToInternalConverter = AccountIdKey.scaleEncoder,
+        key1FromInternalConverter = AccountIdKey.scaleDecoder,
+        key2ToInternalConverter = CallHash.scaleEncoder,
+        key2FromInternalConverter = CallHash.scaleDecoder,
+    )

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/presentation/bridge/BridgeFragment.kt

@@ -50,6 +50,17 @@ class BridgeFragment : BaseFragment<BridgeViewModel, FragmentBridgeBinding>() {
         binder.bridgeSwapButton.setOnClickListener {
             viewModel.swapClicked()
         }
+
+        // Multisig signatory-only sign button
+        binder.bridgeSignButton.setOnClickListener {
+            viewModel.signClicked()
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+
+        viewModel.refreshBridgeStatus()
     }
 
     override fun inject() {
@@ -104,6 +115,27 @@ class BridgeFragment : BaseFragment<BridgeViewModel, FragmentBridgeBinding>() {
                 binder.bridgeHezToDotWarning.text = text
             }
         }
+
+        viewModel.signButtonVisible.observe { visible ->
+            binder.bridgeSignButton.visibility = if (visible) View.VISIBLE else View.GONE
+        }
+
+        viewModel.signButtonRed.observe { red ->
+            val color = if (red) {
+                resources.getColor(R.color.error_border, null)
+            } else {
+                resources.getColor(R.color.text_positive, null)
+            }
+            binder.bridgeSignButton.setButtonColor(color)
+        }
+
+        viewModel.signButtonEnabled.observe { enabled ->
+            binder.bridgeSignButton.isEnabled = enabled
+        }
+
+        viewModel.signButtonLabel.observe { label ->
+            binder.bridgeSignButton.text = label
+        }
     }
 
     private fun updatePairUI(pair: BridgePair) {

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/presentation/bridge/BridgeViewModel.kt

@@ -6,6 +6,8 @@ import io.novafoundation.nova.common.base.BaseViewModel
 import io.novafoundation.nova.common.resources.ResourceManager
 import io.novafoundation.nova.common.view.ButtonState
 import io.novafoundation.nova.feature_assets.R
+import io.novafoundation.nova.feature_assets.domain.bridge.multisig.BridgeMultisigInteractor
+import io.novafoundation.nova.feature_assets.domain.bridge.multisig.BridgeSignerState
 import io.novafoundation.nova.feature_assets.presentation.AssetsRouter
 import io.novafoundation.nova.feature_assets.presentation.send.amount.SendPayload
 import io.novafoundation.nova.feature_wallet_api.presentation.model.AssetPayload
@@ -24,7 +26,8 @@ import java.net.URL
 class BridgeViewModel(
     private val router: AssetsRouter,
     private val resourceManager: ResourceManager,
-    private val chainRegistry: ChainRegistry
+    private val chainRegistry: ChainRegistry,
+    private val bridgeMultisigInteractor: BridgeMultisigInteractor
 ) : BaseViewModel() {
 
     companion object {
@@ -76,6 +79,18 @@ class BridgeViewModel(
     private val _warningText = MutableLiveData<String>()
     val warningText: LiveData<String> = _warningText
 
+    private val _signButtonVisible = MutableLiveData(false)
+    val signButtonVisible: LiveData<Boolean> = _signButtonVisible
+
+    private val _signButtonRed = MutableLiveData(false)
+    val signButtonRed: LiveData<Boolean> = _signButtonRed
+
+    private val _signButtonEnabled = MutableLiveData(false)
+    val signButtonEnabled: LiveData<Boolean> = _signButtonEnabled
+
+    private val _signButtonLabel = MutableLiveData("")
+    val signButtonLabel: LiveData<String> = _signButtonLabel
+
     private var currentAmount: Double = 0.0
     private var dotToHezRate: Double = FALLBACK_RATE
     private var isHezToDotActive: Boolean = false
@@ -84,6 +99,7 @@ class BridgeViewModel(
     init {
         fetchExchangeRate()
         fetchBridgeStatus()
+        refreshSignerState()
     }
 
     fun setPair(newPair: BridgePair) {
@@ -321,5 +337,55 @@ class BridgeViewModel(
 
     fun refreshBridgeStatus() {
         fetchBridgeStatus()
+        refreshSignerState()
+    }
+
+    fun refreshSignerState() {
+        launch {
+            val state = bridgeMultisigInteractor.getSignerState()
+            applySignerState(state)
+        }
+    }
+
+    fun signClicked() {
+        if (_signButtonEnabled.value != true) return
+
+        _signButtonEnabled.postValue(false)
+        _signButtonLabel.postValue(resourceManager.getString(R.string.bridge_sign_in_progress))
+
+        launch {
+            bridgeMultisigInteractor.submitRenewalSignature()
+                .onFailure {
+                    _signButtonLabel.postValue(resourceManager.getString(R.string.bridge_sign_error))
+                }
+            refreshSignerState()
+        }
+    }
+
+    private fun applySignerState(state: BridgeSignerState?) {
+        if (state == null) {
+            _signButtonVisible.postValue(false)
+            return
+        }
+
+        _signButtonVisible.postValue(true)
+
+        when {
+            !state.needsRenewal -> {
+                _signButtonRed.postValue(false)
+                _signButtonEnabled.postValue(false)
+                _signButtonLabel.postValue(resourceManager.getString(R.string.bridge_sign_status_ok, state.signatoryRole))
+            }
+            state.alreadySignedPendingRenewal -> {
+                _signButtonRed.postValue(true)
+                _signButtonEnabled.postValue(false)
+                _signButtonLabel.postValue(resourceManager.getString(R.string.bridge_sign_waiting_others))
+            }
+            else -> {
+                _signButtonRed.postValue(true)
+                _signButtonEnabled.postValue(true)
+                _signButtonLabel.postValue(resourceManager.getString(R.string.bridge_sign_button, state.signatoryRole))
+            }
+        }
     }
 }

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/presentation/bridge/di/BridgeModule.kt

@@ -9,22 +9,40 @@ import dagger.multibindings.IntoMap
 import io.novafoundation.nova.common.di.viewmodel.ViewModelKey
 import io.novafoundation.nova.common.di.viewmodel.ViewModelModule
 import io.novafoundation.nova.common.resources.ResourceManager
+import io.novafoundation.nova.feature_account_api.data.extrinsic.ExtrinsicService
+import io.novafoundation.nova.feature_account_api.domain.interfaces.SelectedAccountUseCase
+import io.novafoundation.nova.feature_assets.domain.bridge.multisig.BridgeMultisigInteractor
+import io.novafoundation.nova.feature_assets.domain.bridge.multisig.RealBridgeMultisigInteractor
 import io.novafoundation.nova.feature_assets.presentation.AssetsRouter
 import io.novafoundation.nova.feature_assets.presentation.bridge.BridgeViewModel
+import io.novafoundation.nova.runtime.di.REMOTE_STORAGE_SOURCE
 import io.novafoundation.nova.runtime.multiNetwork.ChainRegistry
+import io.novafoundation.nova.runtime.storage.source.StorageDataSource
+import javax.inject.Named
 
 @Module(includes = [ViewModelModule::class])
 class BridgeModule {
 
+    @Provides
+    fun provideBridgeMultisigInteractor(
+        chainRegistry: ChainRegistry,
+        selectedAccountUseCase: SelectedAccountUseCase,
+        @Named(REMOTE_STORAGE_SOURCE) storageDataSource: StorageDataSource,
+        extrinsicService: ExtrinsicService
+    ): BridgeMultisigInteractor {
+        return RealBridgeMultisigInteractor(chainRegistry, selectedAccountUseCase, storageDataSource, extrinsicService)
+    }
+
     @Provides
     @IntoMap
     @ViewModelKey(BridgeViewModel::class)
     fun provideViewModel(
         router: AssetsRouter,
         resourceManager: ResourceManager,
-        chainRegistry: ChainRegistry
+        chainRegistry: ChainRegistry,
+        bridgeMultisigInteractor: BridgeMultisigInteractor
     ): ViewModel {
-        return BridgeViewModel(router, resourceManager, chainRegistry)
+        return BridgeViewModel(router, resourceManager, chainRegistry, bridgeMultisigInteractor)
     }
 
     @Provides

feature-assets/src/main/res/layout/fragment_bridge.xml

@@ -330,6 +330,17 @@
                 android:textSize="12sp"
                 android:visibility="gone" />
 
+            <!-- Multisig signatory-only bridge allowance sign button. Only visible to a wallet
+                 that is one of the bridge multisig's 5 known signatories. -->
+            <io.novafoundation.nova.common.view.PrimaryButton
+                android:id="@+id/bridgeSignButton"
+                style="@style/Widget.Nova.Button.Primary"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:text="@string/bridge_sign_button"
+                android:visibility="gone" />
+
         </LinearLayout>
 
     </ScrollView>