Token state check with Y, cashubtc/nuts#93

src/CashuWallet.ts

@@ -500,9 +500,10 @@ class CashuWallet {
 	 * @returns
 	 */
 	async checkProofsSpent<T extends { secret: string }>(proofs: Array<T>): Promise<Array<T>> {
+		const enc = new TextEncoder();
 		const payload = {
-			// array of secrets of proofs to check
-			secrets: proofs.map((p) => p.secret)
+			// array of Ys of proofs to check
+			Ys: proofs.map((p) => dhke.hashToCurve(enc.encode(p.secret)).toHex(true))
 		};
 		const { states } = await this.mint.check(payload);
 

src/model/types/index.ts

@@ -306,10 +306,9 @@ export type PostMintResponse = {
  */
 export type CheckStatePayload = {
 	/**
-	 * array of proofs. Only the secret is strictly needed.
-	 * If the whole object is passed, it will be stripped of other objects before sending it to the mint.
+	 * The Y = hash_to_curve(secret) of the proofs to be checked.
 	 */
-	secrets: Array<string>;
+	Ys: Array<string>;
 };
 
 /**

test/wallet.test.ts

@@ -185,7 +185,7 @@ describe('checkProofsSpent', () => {
 	test('test checkProofsSpent - get proofs that are NOT spendable', async () => {
 		nock(mintUrl)
 			.post('/v1/checkstate')
-			.reply(200, { states: [{ secret: "asd", state: "UNSPENT", witness: "witness-asd" }] });
+			.reply(200, { states: [{ Y: "asd", state: "UNSPENT", witness: "witness-asd" }] });
 		const wallet = new CashuWallet(mint);
 
 		const result = await wallet.checkProofsSpent(proofs);