3 files changed, 14 insertions, 1 deletions
diff --git a/src/ark/manager.js b/src/ark/manager.js
index 01de06f..f9819a0 100644
--- a/src/ark/manager.js
+++ b/src/ark/manager.js
@@ -1270,6 +1270,11 @@ export class ArkManager {
     const tip = await this.chain.tipHeight();
     const totalSat = inputs.reduce((n, v) => n + v.amountSat, 0);
     const feeSat = this.refreshFee(inputs, tip);
+    // The server refuses round outputs under P2TR dust (330), so a wallet
+    // this small can't renew — fail before the action marks coins pending.
+    if (totalSat - feeSat < 330) {
+      throw new Error(`balance too small to refresh: ${totalSat} sat minus ${feeSat} sat fee is under the 330 sat minimum`);
+    }
     const action = {
       id: `refresh-${Date.now()}`, type: 'refresh', step: 'created',
       inputIds: inputs.map((v) => v.id),
diff --git a/src/ark/proto.js b/src/ark/proto.js
index 6729465..81651ee 100644
--- a/src/ark/proto.js
+++ b/src/ark/proto.js
@@ -29,6 +29,9 @@ export function pbWriter() {
   const chunks = [];
   const varint = (n) => {
     n = BigInt(n);
+    // a negative sign-extends under >>= forever — the do/while would push
+    // bytes until the process dies of memory, so refuse it loudly instead
+    if (n < 0n) throw new Error(`varint: negative value ${n}`);
     const bs = [];
     do { let b = Number(n & 0x7fn); n >>= 7n; if (n) b |= 0x80; bs.push(b); } while (n);
     chunks.push(Uint8Array.from(bs));
diff --git a/src/features/gifts.js b/src/features/gifts.js
index bc16619..0543030 100644
--- a/src/features/gifts.js
+++ b/src/features/gifts.js
@@ -402,11 +402,16 @@ export function giftsFeature(ctx) {
 
   // An ark gift: send the amount to a fresh bearer identity, off-chain and
   // instant — no coin locking, no split logic, no claim fee.
+  // Gifts go down to 1 sat: the ASP cosigns all-dust arkoor sends, so a
+  // sub-dust bearer vtxo sweeps to the claimer fine (regtest-proven —
+  // tools/ark/dust-gift-test.js). The trade a sub-330 coin carries — no
+  // unilateral exit on its own, renewable in rounds only alongside bigger
+  // siblings — is the same one dust zaps already make.
   async function doCreateArkGift() {
     const info = hook('arkGiftInfo');
     const avail = info ? info.spendableSat : 0;
     const amt = ui.giftMax ? avail : parseAmount(ui.giftAmount, getUnit());
-    if (!amt || amt < 330) { ui.giftError = t('giftAmountInvalid', { n: fmtAmount(330) + ' ' + unitLabel() }); render(); return; }
+    if (!amt || amt < 1) { ui.giftError = t('giftAmountInvalid', { n: fmtAmount(1) + ' ' + unitLabel() }); render(); return; }
     if (amt > avail) { ui.giftError = t('giftExceedsBalance'); render(); return; }
     ui.busy = true; ui.giftError = ''; render();
     try {