diff --git a/services/identity/Cargo.lock b/services/identity/Cargo.lock
--- a/services/identity/Cargo.lock
+++ b/services/identity/Cargo.lock
@@ -119,6 +119,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
 dependencies = [
+ "block-padding",
  "generic-array",
 ]
 
@@ -131,6 +132,12 @@
  "generic-array",
 ]
 
+[[package]]
+name = "block-padding"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8d696c370c750c948ada61c69a0ee2cbbb9c50b1019ddb86d9317157a99c2cae"
+
 [[package]]
 name = "bumpalo"
 version = "3.9.1"
@@ -260,6 +267,18 @@
  "cfg-if",
 ]
 
+[[package]]
+name = "crypto-bigint"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f83bd3bb4314701c568e340cd8cf78c975aa0ca79e03d3f6d1677d5b0c9c0c03"
+dependencies = [
+ "generic-array",
+ "rand_core 0.6.3",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "crypto-common"
 version = "0.1.3"
@@ -293,6 +312,12 @@
  "zeroize",
 ]
 
+[[package]]
+name = "der"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79b71cca7d95d7681a4b3b9cdf63c8dbc3730d0584c2c74e31416d64a90493f4"
+
 [[package]]
 name = "derive_more"
 version = "0.99.17"
@@ -358,12 +383,39 @@
  "syn",
 ]
 
+[[package]]
+name = "ecdsa"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43ee23aa5b4f68c7a092b5c3beb25f50c406adc75e2363634f242f28ab255372"
+dependencies = [
+ "der",
+ "elliptic-curve",
+ "hmac",
+ "signature",
+]
+
 [[package]]
 name = "either"
 version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
+[[package]]
+name = "elliptic-curve"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "beca177dcb8eb540133e7680baff45e7cc4d93bf22002676cec549f82343721b"
+dependencies = [
+ "crypto-bigint",
+ "ff",
+ "generic-array",
+ "group",
+ "rand_core 0.6.3",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "fastrand"
 version = "1.7.0"
@@ -373,6 +425,16 @@
  "instant",
 ]
 
+[[package]]
+name = "ff"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d0f40b2dcd8bc322217a5f6559ae5f9e9d1de202a2ecee2e9eafcbece7562a4f"
+dependencies = [
+ "rand_core 0.6.3",
+ "subtle",
+]
+
 [[package]]
 name = "fixedbitset"
 version = "0.4.1"
@@ -523,6 +585,17 @@
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "group"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c363a5301b8f153d80747126a04b3c82073b9fe3130571a9d170cacdeaf7912"
+dependencies = [
+ "ff",
+ "rand_core 0.6.3",
+ "subtle",
+]
+
 [[package]]
 name = "h2"
 version = "0.3.13"
@@ -699,6 +772,7 @@
  "rusoto_core",
  "rusoto_dynamodb",
  "sha2",
+ "siwe",
  "tokio",
  "tonic",
  "tonic-build",
@@ -725,6 +799,15 @@
  "cfg-if",
 ]
 
+[[package]]
+name = "iri-string"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f0f7638c1e223529f1bfdc48c8b133b9e0b434094d1d28473161ee48b235f78"
+dependencies = [
+ "nom",
+]
+
 [[package]]
 name = "itertools"
 version = "0.10.3"
@@ -749,6 +832,24 @@
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "k256"
+version = "0.9.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "903ae2481bcdfdb7b68e0a9baa4b7c9aff600b9ae2e8e5bb5833b8c91ab851ea"
+dependencies = [
+ "cfg-if",
+ "ecdsa",
+ "elliptic-curve",
+ "sha3",
+]
+
+[[package]]
+name = "keccak"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9b7d56ba4a8344d6be9729995e6b06f928af29998cdf79fe390cbf6b1fee838"
+
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -787,6 +888,12 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "mio"
 version = "0.8.2"
@@ -834,6 +941,16 @@
  "tempfile",
 ]
 
+[[package]]
+name = "nom"
+version = "7.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8903e5a29a317527874d0402f867152a3d21c908bb0b933e416c65e301d4c36"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
 [[package]]
 name = "ntapi"
 version = "0.3.7"
@@ -1386,6 +1503,18 @@
  "opaque-debug",
 ]
 
+[[package]]
+name = "sha3"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f81199417d4e5de3f04b1e871023acea7389672c4135918f05aa9cbf2f2fa809"
+dependencies = [
+ "block-buffer 0.9.0",
+ "digest 0.9.0",
+ "keccak",
+ "opaque-debug",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.4"
@@ -1410,6 +1539,32 @@
  "libc",
 ]
 
+[[package]]
+name = "signature"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2807892cfa58e081aa1f1111391c7a0649d4fa127a4ffbe34bcbfb35a1171a4"
+dependencies = [
+ "digest 0.9.0",
+ "rand_core 0.6.3",
+]
+
+[[package]]
+name = "siwe"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86f2d8ae2d4ae58df46e173aa496562ea857ac6a4f0d435ed30fcd19da0aaa79"
+dependencies = [
+ "chrono",
+ "hex",
+ "http",
+ "iri-string",
+ "k256",
+ "rand",
+ "sha3",
+ "thiserror",
+]
+
 [[package]]
 name = "slab"
 version = "0.4.6"
diff --git a/services/identity/Cargo.toml b/services/identity/Cargo.toml
--- a/services/identity/Cargo.toml
+++ b/services/identity/Cargo.toml
@@ -22,6 +22,7 @@
 chrono = "0.4.19"
 rand = "0.8"
 bytes = "1.1"
+siwe = "0.3"
 
 [build-dependencies]
 tonic-build = "0.6"
diff --git a/services/identity/src/service.rs b/services/identity/src/service.rs
--- a/services/identity/src/service.rs
+++ b/services/identity/src/service.rs
@@ -1,3 +1,4 @@
+use chrono::{DateTime, Utc};
 use futures_core::Stream;
 use opaque_ke::{
   errors::ProtocolError, CredentialFinalization, CredentialRequest,
@@ -6,9 +7,10 @@
   ServerLoginStartResult, ServerRegistration,
 };
 use rand::{CryptoRng, Rng};
+use siwe::{Message, ParseError, VerificationError};
 use std::pin::Pin;
 use tokio::sync::mpsc::{error::SendError, Sender};
-use tonic::{Request, Response, Status};
+use tonic::{codegen::http::uri::Authority, Request, Response, Status};
 
 use crate::{
   config::Config,
@@ -144,6 +146,19 @@
       )?)
       .map_err(Error::Pake)
   }
+
+  fn wallet_login(
+    &self,
+    message: String,
+    signature: [u8; 65],
+    domain: Option<&Authority>,
+    nonce: Option<&str>,
+    timestamp: Option<&DateTime<Utc>>,
+  ) -> Result<(), Error> {
+    let message: Message = message.parse()?;
+    message.verify(signature, domain, nonce, timestamp)?;
+    Ok(())
+  }
 }
 
 #[derive(
@@ -158,4 +173,8 @@
   Database(DatabaseError),
   #[display(...)]
   MissingRegistration,
+  #[display(...)]
+  WalletSignature(VerificationError),
+  #[display(...)]
+  WalletMessage(ParseError),
 }