From f056790c67c695a980dc5a194abfcb5313ffcdab Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@zoso.dev>
Date: Fri, 8 Aug 2025 12:23:15 -0700
Subject: [PATCH] Change block previous property to bytes.

---
 src/lib/block.ts  | 10 +++++-----
 src/lib/ledger.ts |  4 ++--
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/lib/block.ts b/src/lib/block.ts
index 32ce1c3..e8a3e38 100644
--- a/src/lib/block.ts
+++ b/src/lib/block.ts
@@ -66,7 +66,7 @@ export class Block {
 	subtype?: 'send' | 'receive' | 'change'
 	account: Account
 	balance: bigint
-	previous: string
+	previous: Uint8Array<ArrayBuffer>
 	representative?: Account
 	link?: Uint8Array<ArrayBuffer>
 	signature?: string
@@ -108,7 +108,7 @@ export class Block {
 			}
 			this.account = account
 			this.balance = convert(balance, 'raw', 'raw', 'bigint')
-			this.previous = previous
+			this.previous = hex.toBytes(previous, 32)
 			if (representative instanceof Account) {
 				this.representative = representative
 			}
@@ -135,7 +135,7 @@ export class Block {
 			const data = [
 				PREAMBLE,
 				this.account.publicKey,
-				this.previous.padStart(64, '0'),
+				this.previous,
 				this.representative.publicKey,
 				dec.toHex(this.balance, 32),
 				this.link
@@ -173,7 +173,7 @@ export class Block {
 			return {
 				"type": "state",
 				"account": this.account.address,
-				"previous": this.previous,
+				"previous": bytes.toHex(this.previous),
 				"representative": this.representative.address ?? '',
 				"balance": this.balance.toString(),
 				"link": bytes.toHex(this.link),
@@ -230,7 +230,7 @@ export class Block {
 		const difficulty: bigint = (this.subtype === 'send' || this.subtype === 'change')
 			? DIFFICULTY_SEND
 			: DIFFICULTY_RECEIVE
-		const hash = +this.previous === 0 ? this.account.publicKey : this.previous
+		const hash = this.previous.every(b => b === 0) ? this.account.publicKey : bytes.toHex(this.previous)
 		if (work == null) {
 			const result = await NanoPow.work_generate(hash, { difficulty })
 			if ('error' in result) {
diff --git a/src/lib/ledger.ts b/src/lib/ledger.ts
index babb9bd..9834c35 100644
--- a/src/lib/ledger.ts
+++ b/src/lib/ledger.ts
@@ -488,7 +488,7 @@ export class Ledger extends Wallet {
 		const purpose = dec.toBytes(BIP44_PURPOSE + HARDENED_OFFSET, 4)
 		const coin = dec.toBytes(BIP44_COIN_NANO + HARDENED_OFFSET, 4)
 		const account = dec.toBytes(index + HARDENED_OFFSET, 4)
-		const previous = hex.toBytes(block.previous === block.account.publicKey ? '0' : block.previous, 32)
+		const previous = block.previous
 		const link = block.link
 		const representative = hex.toBytes(block.representative.publicKey, 32)
 		const balance = hex.toBytes(block.balance.toString(16), 16)
@@ -524,7 +524,7 @@ export class Ledger extends Wallet {
 		}
 
 		const account = dec.toBytes(index + HARDENED_OFFSET, 4)
-		const previous = hex.toBytes(block.previous, 32)
+		const previous = block.previous
 		const link = block.link
 		const representative = hex.toBytes(block.representative.publicKey, 32)
 		const balance = hex.toBytes(BigInt(block.balance).toString(16), 16)
-- 
2.47.3