diff --git a/packages/bcp/src/address.ts b/packages/bcp/src/address.ts
index 1fc4ddb2..ce6aa25b 100644
--- a/packages/bcp/src/address.ts
+++ b/packages/bcp/src/address.ts
@@ -1,4 +1,4 @@
-import { CosmosBech32Prefix, decodeBech32Pubkey, encodeAddress, isValidAddress } from "@cosmwasm/sdk";
+import { CosmosBech32Prefix, decodeBech32Pubkey, encodeAddress, isValidAddress, types } from "@cosmwasm/sdk";
 import { Address, Algorithm, PubkeyBundle, PubkeyBytes } from "@iov/bcp";
 import { Secp256k1 } from "@iov/crypto";
 import { Encoding } from "@iov/encoding";
@@ -12,9 +12,9 @@ export function decodeCosmosPubkey(
 ): { readonly algo: Algorithm; readonly data: PubkeyBytes } {
   const sdkPubKey = decodeBech32Pubkey(encodedPubkey);
   switch (sdkPubKey.type) {
-    case "tendermint/PubKeySecp256k1":
+    case types.pubkeyType.secp256k1:
       return { algo: Algorithm.Secp256k1, data: fromBase64(sdkPubKey.value) as PubkeyBytes };
-    case "tendermint/PubKeyEd25519":
+    case types.pubkeyType.ed25519:
       return { algo: Algorithm.Ed25519, data: fromBase64(sdkPubKey.value) as PubkeyBytes };
     default:
       throw new Error("Unsupported Pubkey type: " + sdkPubKey.type);
@@ -23,22 +23,20 @@ export function decodeCosmosPubkey(
 
 // See https://github.com/tendermint/tendermint/blob/f2ada0a604b4c0763bda2f64fac53d506d3beca7/docs/spec/blockchain/encoding.md#public-key-cryptography
 export function pubkeyToAddress(pubkey: PubkeyBundle, prefix: CosmosBech32Prefix): Address {
-  let pubkeyType: "tendermint/PubKeySecp256k1" | "tendermint/PubKeyEd25519";
-  let pubkeyData: Uint8Array = pubkey.data;
-
+  let sdkKey: types.PubKey;
   if (pubkey.algo === Algorithm.Secp256k1) {
-    pubkeyType = "tendermint/PubKeySecp256k1";
-    if (pubkeyData.length > 33) {
-      pubkeyData = Secp256k1.compressPubkey(pubkey.data);
-    }
+    sdkKey = {
+      type: types.pubkeyType.secp256k1,
+      value: toBase64(pubkey.data.length > 33 ? Secp256k1.compressPubkey(pubkey.data) : pubkey.data),
+    };
   } else if (pubkey.algo === Algorithm.Ed25519) {
-    pubkeyType = "tendermint/PubKeyEd25519";
+    sdkKey = {
+      type: types.pubkeyType.ed25519,
+      value: toBase64(pubkey.data),
+    };
   } else {
     throw new Error(`Unsupported algorithm: ${pubkey.algo}`);
   }
-  const sdkKey = {
-    type: pubkeyType,
-    value: toBase64(pubkeyData),
-  };
+
   return encodeAddress(sdkKey, prefix) as Address;
 }
diff --git a/packages/bcp/src/decode.ts b/packages/bcp/src/decode.ts
index 77b3eb30..c68325ba 100644
--- a/packages/bcp/src/decode.ts
+++ b/packages/bcp/src/decode.ts
@@ -25,14 +25,12 @@ const { fromBase64 } = Encoding;
 
 export function decodePubkey(pubkey: types.PubKey): PubkeyBundle {
   switch (pubkey.type) {
-    // https://github.com/tendermint/tendermint/blob/v0.33.0/crypto/secp256k1/secp256k1.go#L23
-    case "tendermint/PubKeySecp256k1":
+    case types.pubkeyType.secp256k1:
       return {
         algo: Algorithm.Secp256k1,
         data: fromBase64(pubkey.value) as PubkeyBytes,
       };
-    // https://github.com/tendermint/tendermint/blob/v0.33.0/crypto/ed25519/ed25519.go#L22
-    case "tendermint/PubKeyEd25519":
+    case types.pubkeyType.ed25519:
       return {
         algo: Algorithm.Ed25519,
         data: fromBase64(pubkey.value) as PubkeyBytes,
diff --git a/packages/bcp/src/encode.ts b/packages/bcp/src/encode.ts
index 164fb867..479895b2 100644
--- a/packages/bcp/src/encode.ts
+++ b/packages/bcp/src/encode.ts
@@ -20,12 +20,12 @@ export function encodePubkey(pubkey: PubkeyBundle): types.PubKey {
   switch (pubkey.algo) {
     case Algorithm.Secp256k1:
       return {
-        type: "tendermint/PubKeySecp256k1",
+        type: types.pubkeyType.secp256k1,
         value: toBase64(pubkey.data),
       };
     case Algorithm.Ed25519:
       return {
-        type: "tendermint/PubKeyEd25519",
+        type: types.pubkeyType.ed25519,
         value: toBase64(pubkey.data),
       };
     default:
diff --git a/packages/sdk/src/address.ts b/packages/sdk/src/address.ts
index 5819dca3..9f553d5c 100644
--- a/packages/sdk/src/address.ts
+++ b/packages/sdk/src/address.ts
@@ -2,7 +2,7 @@ import { Ripemd160, Sha256 } from "@iov/crypto";
 import { Bech32, Encoding } from "@iov/encoding";
 import equal from "fast-deep-equal";
 
-import { Bech32PubKey, PubKey } from "./types";
+import { Bech32PubKey, PubKey, pubkeyType } from "./types";
 
 const { fromBase64, toBase64 } = Encoding;
 
@@ -40,7 +40,7 @@ export function decodeBech32Pubkey(bech: Bech32PubKey): PubKey {
       throw new Error("Invalid rest data length. Expected 33 bytes (compressed secp256k1 pubkey).");
     }
     return {
-      type: "tendermint/PubKeySecp256k1",
+      type: pubkeyType.secp256k1,
       value: toBase64(rest),
     };
   } else if (equal(aminoPrefix, pubkeyAminoPrefixEd25519)) {
@@ -48,7 +48,7 @@ export function decodeBech32Pubkey(bech: Bech32PubKey): PubKey {
       throw new Error("Invalid rest data length. Expected 32 bytes (Ed25519 pubkey).");
     }
     return {
-      type: "tendermint/PubKeyEd25519",
+      type: pubkeyType.ed25519,
       value: toBase64(rest),
     };
   } else if (equal(aminoPrefix, pubkeyAminoPrefixSr25519)) {
@@ -56,7 +56,7 @@ export function decodeBech32Pubkey(bech: Bech32PubKey): PubKey {
       throw new Error("Invalid rest data length. Expected 32 bytes (Sr25519 pubkey).");
     }
     return {
-      type: "tendermint/PubKeySr25519",
+      type: pubkeyType.sr25519,
       value: toBase64(rest),
     };
   } else {
@@ -81,7 +81,7 @@ export function isValidAddress(address: string): boolean {
 export function encodeAddress(pubkey: PubKey, prefix: string): string {
   const pubkeyBytes = fromBase64(pubkey.value);
   switch (pubkey.type) {
-    case "tendermint/PubKeySecp256k1": {
+    case pubkeyType.secp256k1: {
       if (pubkeyBytes.length !== 33) {
         throw new Error(`Invalid Secp256k1 pubkey length (compressed): ${pubkeyBytes.length}`);
       }
@@ -89,14 +89,14 @@ export function encodeAddress(pubkey: PubKey, prefix: string): string {
       const hash2 = new Ripemd160(hash1).digest();
       return Bech32.encode(prefix, hash2);
     }
-    case "tendermint/PubKeyEd25519": {
+    case pubkeyType.ed25519: {
       if (pubkeyBytes.length !== 32) {
         throw new Error(`Invalid Ed25519 pubkey length: ${pubkeyBytes.length}`);
       }
       const hash = new Sha256(pubkeyBytes).digest();
       return Bech32.encode(prefix, hash.slice(0, 20));
     }
-    case "tendermint/PubKeySr25519": {
+    case pubkeyType.sr25519: {
       if (pubkeyBytes.length !== 32) {
         throw new Error(`Invalid Sr25519 pubkey length: ${pubkeyBytes.length}`);
       }
diff --git a/packages/sdk/src/encoding.ts b/packages/sdk/src/encoding.ts
index 88844d26..ad3a4fa1 100644
--- a/packages/sdk/src/encoding.ts
+++ b/packages/sdk/src/encoding.ts
@@ -1,7 +1,7 @@
 import { Secp256k1 } from "@iov/crypto";
 import { Encoding } from "@iov/encoding";
 
-import { Msg, NonceInfo, StdFee, StdSignature, StdTx } from "./types";
+import { Msg, NonceInfo, pubkeyType, StdFee, StdSignature, StdTx } from "./types";
 
 const { toBase64, toUtf8 } = Encoding;
 
@@ -62,7 +62,7 @@ export function encodeSecp256k1Signature(pubkey: Uint8Array, signature: Uint8Arr
   return {
     // eslint-disable-next-line @typescript-eslint/camelcase
     pub_key: {
-      type: "tendermint/PubKeySecp256k1",
+      type: pubkeyType.secp256k1,
       value: toBase64(Secp256k1.compressPubkey(pubkey)),
     },
     // Recovery seems to be unused
diff --git a/packages/sdk/src/types.ts b/packages/sdk/src/types.ts
index 2e1ecbe8..c09e0130 100644
--- a/packages/sdk/src/types.ts
+++ b/packages/sdk/src/types.ts
@@ -110,11 +110,16 @@ export interface PubKey {
   readonly value: string;
 }
 
-export const pubkeyTypes: readonly string[] = [
-  "tendermint/PubKeySecp256k1",
-  "tendermint/PubKeyEd25519",
-  "tendermint/PubKeySr25519",
-];
+export const pubkeyType = {
+  /** @see https://github.com/tendermint/tendermint/blob/v0.33.0/crypto/ed25519/ed25519.go#L22 */
+  secp256k1: "tendermint/PubKeySecp256k1" as const,
+  /** @see https://github.com/tendermint/tendermint/blob/v0.33.0/crypto/secp256k1/secp256k1.go#L23 */
+  ed25519: "tendermint/PubKeyEd25519" as const,
+  /** @see https://github.com/tendermint/tendermint/blob/v0.33.0/crypto/sr25519/codec.go#L12 */
+  sr25519: "tendermint/PubKeySr25519" as const,
+};
+
+export const pubkeyTypes: readonly string[] = [pubkeyType.secp256k1, pubkeyType.ed25519, pubkeyType.sr25519];
 
 // bech32-encoded amino-binary encoded PubKey interface. oof.
 export type Bech32PubKey = string;
diff --git a/packages/sdk/types/types.d.ts b/packages/sdk/types/types.d.ts
index fc750bf8..c495126c 100644
--- a/packages/sdk/types/types.d.ts
+++ b/packages/sdk/types/types.d.ts
@@ -74,6 +74,14 @@ export interface PubKey {
   readonly type: string;
   readonly value: string;
 }
+export declare const pubkeyType: {
+  /** @see https://github.com/tendermint/tendermint/blob/v0.33.0/crypto/ed25519/ed25519.go#L22 */
+  secp256k1: "tendermint/PubKeySecp256k1";
+  /** @see https://github.com/tendermint/tendermint/blob/v0.33.0/crypto/secp256k1/secp256k1.go#L23 */
+  ed25519: "tendermint/PubKeyEd25519";
+  /** @see https://github.com/tendermint/tendermint/blob/v0.33.0/crypto/sr25519/codec.go#L12 */
+  sr25519: "tendermint/PubKeySr25519";
+};
 export declare const pubkeyTypes: readonly string[];
 export declare type Bech32PubKey = string;
 export interface BaseAccount {