make block number optional

Sources/XMTPiOS/Client.swift

@@ -248,7 +248,11 @@ public final class Client {
 					do {
 						let signedData = try await signingKey.sign(message: signatureRequest.signatureText())
 						if signingKey.isSmartContractWallet {
-							try await signatureRequest.addScwSignature(signatureBytes: signedData.rawData, address: signingKey.address, chainId: signingKey.chainId, blockNumber: signingKey.blockNumber)
+							try await signatureRequest.addScwSignature(signatureBytes: signedData.rawData,
+																	   address: signingKey.address,
+																	   chainId: UInt64(signingKey.chainId),
+																	   blockNumber: signingKey.blockNumber.flatMap { $0 >= 0 ? UInt64($0) : nil })
+
 						} else {
 							try await signatureRequest.addEcdsaSignature(signatureBytes: signedData.rawData)
 						}

Sources/XMTPiOS/SigningKey.swift

@@ -24,10 +24,10 @@ public protocol SigningKey {
 	var isSmartContractWallet: Bool { get }
 
 	/// The name of the chainId for example "1"
-	var chainId: UInt64 { get }
+	var chainId: Int64 { get }
 
 	/// The blockNumber of the chain for example "1"
-	var blockNumber: UInt64 { get }
+	var blockNumber: Int64? { get }
 
 	/// Sign the data and return a secp256k1 compact recoverable signature.
 	func sign(_ data: Data) async throws -> Signature
@@ -42,12 +42,12 @@ extension SigningKey {
 		return false
 	}
 
-	public var chainId: UInt64 {
+	public var chainId: Int64 {
 		return 1
 	}
 
-	public var blockNumber: UInt64 {
-		return 1
+	public var blockNumber: Int64? {
+		return nil
 	}
 
 	func createIdentity(_ identity: PrivateKey, preCreateIdentityCallback: PreEventCallback? = nil) async throws -> AuthorizedIdentity {

XMTP.podspec

@@ -16,7 +16,7 @@ Pod::Spec.new do |spec|
   #
 
   spec.name         = "XMTP"
-  spec.version      = "0.15.1"
+  spec.version      = "0.15.1-alpha0"
   spec.summary      = "XMTP SDK Cocoapod"
 
   # This description is used to generate tags and improve search results.