ItsGoin v0.3.2 — Decentralized social media network

No central server, user-owned data, reverse-chronological feed.
Rust core + Tauri desktop + Android app + plain HTML/CSS/JS frontend.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/core/src/content.rs

@@ -0,0 +1,61 @@
+use crate::types::{Post, PostId};
+
+/// Compute the content ID (BLAKE3 hash) of a post.
+/// This is deterministic: same post data always produces the same ID.
+pub fn compute_post_id(post: &Post) -> PostId {
+    let bytes = serde_json::to_vec(post).expect("post serialization should not fail");
+    *blake3::hash(&bytes).as_bytes()
+}
+
+/// Verify that a post's content matches the claimed ID
+pub fn verify_post_id(id: &PostId, post: &Post) -> bool {
+    &compute_post_id(post) == id
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_deterministic_hashing() {
+        let post = Post {
+            author: [1u8; 32],
+            content: "hello world".to_string(),
+            attachments: vec![],
+            timestamp_ms: 1000,
+        };
+        let id1 = compute_post_id(&post);
+        let id2 = compute_post_id(&post);
+        assert_eq!(id1, id2);
+    }
+
+    #[test]
+    fn test_different_content_different_id() {
+        let post1 = Post {
+            author: [1u8; 32],
+            content: "hello".to_string(),
+            attachments: vec![],
+            timestamp_ms: 1000,
+        };
+        let post2 = Post {
+            author: [1u8; 32],
+            content: "world".to_string(),
+            attachments: vec![],
+            timestamp_ms: 1000,
+        };
+        assert_ne!(compute_post_id(&post1), compute_post_id(&post2));
+    }
+
+    #[test]
+    fn test_verify() {
+        let post = Post {
+            author: [1u8; 32],
+            content: "test".to_string(),
+            attachments: vec![],
+            timestamp_ms: 1000,
+        };
+        let id = compute_post_id(&post);
+        assert!(verify_post_id(&id, &post));
+        assert!(!verify_post_id(&[0u8; 32], &post));
+    }
+}