diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index a7cfc24..17e9f77 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -430,10 +430,16 @@ multi-modal payloads (text inline, audio/photo/data via `iroh-blobs`). Receiving
             --example iroh_engine` → the **real Engine** (unchanged public API)
             syncs a clipboard A→B, E2E-decrypted, **no SSE/RTC/LAN/relay**. The
             seam paid off — zero engine/client changes.
+            - [x] **Files via `iroh-blobs`** — `send_file` adds the (sealed) bytes
+                  to a `MemStore`, broadcasts a blob announcement over gossip;
+                  peers fetch P2P by hash and emit `MeshEvent::File`. Replaces the
+                  M/C/E frame protocol. Verified: a 200 KB photo syncs A→B
+                  E2E-decrypted alongside text (`iroh_engine` example).
             - [ ] Remaining: rendezvous for zero-config bootstrap (today via
-                  `TETHER_IROH_BOOTSTRAP` env stopgap); file transfer via
-                  `iroh-blobs`; make webrtc/mdns/reqwest optional so the iroh/wasm
-                  build is lean; A/B vs RTC+LAN; flip the feature on by default.
+                  `TETHER_IROH_BOOTSTRAP` env stopgap); cross-compile the feature
+                  for iOS + build the xcframework with it; make webrtc/mdns/reqwest
+                  optional so the iroh/wasm build is lean; A/B vs RTC+LAN; flip the
+                  feature on by default.
 - [ ] Spike **Automerge** as the Sync tier; re-express the clipboard as a tiny
       app over replicated state to validate the App API.
 - [ ] Durable device keypairs + authenticated handshake (Noise/`snow`, or
diff --git a/core/Cargo.lock b/core/Cargo.lock
index 511d291..59c1b93 100644
--- a/core/Cargo.lock
+++ b/core/Cargo.lock
@@ -161,7 +161,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "serde",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -185,7 +185,7 @@ version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5493c3bedbacf7fd7382c6346bbd66687d12bbaad3a89a2d2c303ee6cf20b048"
 dependencies = [
- "asn1-rs-derive",
+ "asn1-rs-derive 0.5.1",
  "asn1-rs-impl",
  "displaydoc",
  "nom",
@@ -195,6 +195,22 @@ dependencies = [
  "time",
 ]
 
+[[package]]
+name = "asn1-rs"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7f43a50ac4fdca5df8e885c21b835997f0a1cdee65494a6847694a98652d9d8"
+dependencies = [
+ "asn1-rs-derive 0.6.0",
+ "asn1-rs-impl",
+ "displaydoc",
+ "nom",
+ "num-traits",
+ "rusticata-macros",
+ "thiserror 2.0.18",
+ "time",
+]
+
 [[package]]
 name = "asn1-rs-derive"
 version = "0.5.1"
@@ -203,7 +219,19 @@ checksum = "965c2d33e53cb6b267e148a4cb0760bc01f4904c1cd4bb4002a085bb016d1490"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
+ "synstructure",
+]
+
+[[package]]
+name = "asn1-rs-derive"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3109e49b1e4909e9db6515a30c633684d68cdeaa252f215214cb4fa1a5bfee2c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.118",
  "synstructure",
 ]
 
@@ -215,7 +243,7 @@ checksum = "7b18050c2cd6fe86c3a76584ef5e0baf286d038cda203eb6223df2cc413565f7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -226,7 +254,7 @@ checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -240,6 +268,15 @@ dependencies = [
  "rustc_version",
 ]
 
+[[package]]
+name = "atomic-polyfill"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8cf2bce30dfe09ef0bfaef228b9d414faaf7e563035494d7fe092dba54b300f4"
+dependencies = [
+ "critical-section",
+]
+
 [[package]]
 name = "atomic-waker"
 version = "1.1.2"
@@ -275,6 +312,25 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "bao-tree"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06384416b1825e6e04fde63262fda2dc408f5b64c02d04e0d8b70ae72c17a52b"
+dependencies = [
+ "blake3",
+ "bytes",
+ "futures-lite",
+ "genawaiter",
+ "iroh-io",
+ "positioned-io",
+ "range-collections",
+ "self_cell",
+ "serde",
+ "smallvec",
+ "tokio",
+]
+
 [[package]]
 name = "base16ct"
 version = "0.2.0"
@@ -308,6 +364,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "binary-merge"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "597bb81c80a54b6a4381b23faba8d7774b144c94cbd1d6fe3f1329bd776554ab"
+
 [[package]]
 name = "bincode"
 version = "1.3.3"
@@ -317,6 +379,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "bit-vec"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b71798fca2c1fe1086445a7258a4bc81e6e49dcd24c8d0dd9a1e57395b603f51"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -405,7 +476,7 @@ checksum = "89385e82b5d1821d2219e0b095efa2cc1f246cbf99080f3be46a1a85c0d392d9"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -546,8 +617,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1aa79e62e7697b8e29b513a68abacf485adcd1fe8284a4316c5ae868e6633327"
 dependencies = [
  "iana-time-zone",
+ "js-sys",
  "num-traits",
  "serde",
+ "wasm-bindgen",
  "windows-link",
 ]
 
@@ -593,7 +666,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -850,7 +923,7 @@ checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -874,7 +947,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -885,7 +958,7 @@ checksum = "fc34b93ccb385b40dc71c6fceac4b2ad23662c7eeb248cf10d529b7e055b6ead"
 dependencies = [
  "darling_core",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -911,7 +984,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ccc2776f0c61eca1ca32528f85548abd1a4be8fb53d1b21c013e4f18da1e7090"
 dependencies = [
  "data-encoding",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -942,7 +1015,21 @@ version = "9.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5cd0a5c643689626bec213c4d8bd4d96acc8ffdb4ad4bb6bc16abf27d5f4b553"
 dependencies = [
- "asn1-rs",
+ "asn1-rs 0.6.2",
+ "displaydoc",
+ "nom",
+ "num-bigint",
+ "num-traits",
+ "rusticata-macros",
+]
+
+[[package]]
+name = "der-parser"
+version = "10.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07da5016415d5a3c4dd39b11ed26f915f52fc4e0dc197d87908bc916e51bc1a6"
+dependencies = [
+ "asn1-rs 0.7.2",
  "displaydoc",
  "nom",
  "num-bigint",
@@ -974,7 +1061,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -984,7 +1071,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab63b0e2bf4d5928aff72e83a7dace85d7bba5fe12dcc3c5a572d78caffd3f3c"
 dependencies = [
  "derive_builder_core",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -1006,7 +1093,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "syn",
+ "syn 2.0.118",
  "unicode-xid",
 ]
 
@@ -1059,7 +1146,7 @@ checksum = "1ac70aa55017e108007fbaf5aa0f54b021c98f92ff8af59d42eda9da96e3dd4f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -1087,7 +1174,7 @@ dependencies = [
  "cbc",
  "ccm",
  "chacha20poly1305",
- "der-parser",
+ "der-parser 9.0.0",
  "hmac",
  "log",
  "p256",
@@ -1095,7 +1182,7 @@ dependencies = [
  "portable-atomic",
  "rand 0.9.4",
  "rand_core 0.6.4",
- "rcgen",
+ "rcgen 0.13.2",
  "ring",
  "rkyv",
  "rustls",
@@ -1106,7 +1193,7 @@ dependencies = [
  "tokio",
  "webrtc-util",
  "x25519-dalek",
- "x509-parser",
+ "x509-parser 0.16.0",
 ]
 
 [[package]]
@@ -1197,7 +1284,7 @@ checksum = "3ed8956bd5c1f0415200516e78ff07ec9e16415ade83c056c230d7b7ea0d55b7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -1216,6 +1303,18 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "fastbloom"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef975e30683b2d965054bb0a836f8973857c4ebf6acf274fe46617cd285060d8"
+dependencies = [
+ "foldhash",
+ "libm",
+ "portable-atomic",
+ "siphasher 1.0.3",
+]
+
 [[package]]
 name = "fastrand"
 version = "2.4.1"
@@ -1392,7 +1491,7 @@ checksum = "e835b70203e41293343137df5c0664546da5745f82ec9b84d40be8336958447b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -1424,6 +1523,37 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "genawaiter"
+version = "0.99.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c86bd0361bcbde39b13475e6e36cb24c329964aa2611be285289d1e4b751c1a0"
+dependencies = [
+ "futures-core",
+ "genawaiter-macro",
+ "genawaiter-proc-macro",
+ "proc-macro-hack",
+]
+
+[[package]]
+name = "genawaiter-macro"
+version = "0.99.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b32dfe1fdfc0bbde1f22a5da25355514b5e450c33a6af6770884c8750aedfbc"
+
+[[package]]
+name = "genawaiter-proc-macro"
+version = "0.99.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "784f84eebc366e15251c4a8c3acee82a6a6f427949776ecb88377362a9621738"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "generator"
 version = "0.8.9"
@@ -1560,6 +1690,15 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "hash32"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0c35f58762feb77d74ebe43bdbc3210f09be9fe6742234d573bacc26ed92b67"
+dependencies = [
+ "byteorder",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.17.1"
@@ -1571,6 +1710,20 @@ dependencies = [
  "foldhash",
 ]
 
+[[package]]
+name = "heapless"
+version = "0.7.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdc6457c0eb62c71aac4bc17216026d8410337c4126773b9c5daba343f17964f"
+dependencies = [
+ "atomic-polyfill",
+ "hash32",
+ "rustc_version",
+ "serde",
+ "spin 0.9.8",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -1982,6 +2135,15 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "inplace-vec-builder"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf64c2edc8226891a71f127587a2861b132d2b942310843814d5001d99a1d307"
+dependencies = [
+ "smallvec",
+]
+
 [[package]]
 name = "interceptor"
 version = "0.17.1"
@@ -2095,6 +2257,47 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "iroh-blobs"
+version = "0.103.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5be50b0e2d0a9ba65cee4e0dfb708b3704e02ad12bd4c14c6307e94245943126"
+dependencies = [
+ "arrayvec",
+ "bao-tree",
+ "bytes",
+ "cfg_aliases",
+ "chrono",
+ "constant_time_eq",
+ "data-encoding",
+ "derive_more",
+ "genawaiter",
+ "getrandom 0.4.3",
+ "hex",
+ "iroh",
+ "iroh-base",
+ "iroh-io",
+ "iroh-metrics",
+ "iroh-tickets",
+ "iroh-util",
+ "irpc",
+ "n0-error",
+ "n0-future",
+ "nested_enum_utils",
+ "noq",
+ "postcard",
+ "rand 0.10.1",
+ "range-collections",
+ "redb",
+ "ref-cast",
+ "reflink-copy",
+ "self_cell",
+ "serde",
+ "smallvec",
+ "tokio",
+ "tracing",
+]
+
 [[package]]
 name = "iroh-dns"
 version = "1.0.0"
@@ -2146,6 +2349,19 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "iroh-io"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0a5feb781017b983ff1b155cd1faf8174da2acafd807aa482876da2d7e6577a"
+dependencies = [
+ "bytes",
+ "futures-lite",
+ "pin-project",
+ "smallvec",
+ "tokio",
+]
+
 [[package]]
 name = "iroh-metrics"
 version = "1.0.1"
@@ -2170,7 +2386,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -2219,17 +2435,51 @@ dependencies = [
  "ws_stream_wasm",
 ]
 
+[[package]]
+name = "iroh-tickets"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da53233419ca36bf521ed45683b7748366f9b233032891eefc2d70567a84ac54"
+dependencies = [
+ "data-encoding",
+ "derive_more",
+ "iroh-base",
+ "n0-error",
+ "postcard",
+ "serde",
+]
+
+[[package]]
+name = "iroh-util"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20e41eb982f15230c55f0a70a74a514360e1f565b07861924fd0e8db172b3d00"
+dependencies = [
+ "derive_more",
+ "iroh",
+ "n0-error",
+ "n0-future",
+ "tokio",
+ "tracing",
+]
+
 [[package]]
 name = "irpc"
 version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3623d6ff582b415904b29bbe6ebcb4a4f9a262ccdee05a45fdd003ef0950c386"
 dependencies = [
+ "futures-buffered",
  "futures-util",
  "irpc-derive",
  "n0-error",
  "n0-future",
+ "noq",
+ "postcard",
+ "rcgen 0.14.8",
+ "rustls",
  "serde",
+ "smallvec",
  "tokio",
  "tokio-util",
  "tracing",
@@ -2243,7 +2493,7 @@ checksum = "35c254013736de16472140d26904e6ac98e8f3887284dcf4af40f88c77411b56"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -2301,7 +2551,7 @@ dependencies = [
  "quote",
  "rustc_version",
  "simd_cesu8",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -2329,7 +2579,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "38c0b942f458fe50cdac086d2f946512305e5631e720728f2a61aabcd47a6264"
 dependencies = [
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -2355,6 +2605,18 @@ version = "0.2.186"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "68ab91017fe16c622486840e4c83c9a37afeff978bd239b5293d61ece587de66"
 
+[[package]]
+name = "libm"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6d2cec3eae94f9f509c767b45932f1ada8350c4bdb85af2fcab4a3c14807981"
+
+[[package]]
+name = "linux-raw-sys"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a66949e030da00e8c7d4434b251670a91556f4144941d37452769c25d58a53"
+
 [[package]]
 name = "litemap"
 version = "0.8.2"
@@ -2527,7 +2789,7 @@ checksum = "4568f25ccbd45ab5d5603dc34318c1ec56b117531781260002151b8530a9f931"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -2549,7 +2811,7 @@ checksum = "e2acd8b070213b0299282f884b4beba4e7b52d624fdcd504a3ad3665390c11e1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -2590,6 +2852,18 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "27b02d87554356db9e9a873add8782d4ea6e3e58ea071a9adb9a2e8ddb884a8b"
 
+[[package]]
+name = "nested_enum_utils"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1d5475271bdd36a4a2769eac1ef88df0f99428ea43e52dfd8b0ee5cb674695f"
+dependencies = [
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.118",
+]
+
 [[package]]
 name = "netdev"
 version = "0.44.0"
@@ -2769,6 +3043,7 @@ dependencies = [
  "bytes",
  "derive_more",
  "enum-assoc",
+ "fastbloom",
  "getrandom 0.4.3",
  "identity-hash",
  "lru-slab",
@@ -2778,6 +3053,7 @@ dependencies = [
  "rustc-hash",
  "rustls",
  "rustls-pki-types",
+ "rustls-platform-verifier",
  "slab",
  "sorted-index-buffer",
  "thiserror 2.0.18",
@@ -2861,7 +3137,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -2969,7 +3245,16 @@ version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8d8034d9489cdaf79228eb9f6a3b8d7bb32ba00d6645ebd48eef4077ceb5bd9"
 dependencies = [
- "asn1-rs",
+ "asn1-rs 0.6.2",
+]
+
+[[package]]
+name = "oid-registry"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12f40cff3dde1b6087cc5d5f5d4d65712f34016a03ed60e9c08dcc392736b5b7"
+dependencies = [
+ "asn1-rs 0.7.2",
 ]
 
 [[package]]
@@ -3130,7 +3415,7 @@ checksum = "c96395f0a926bc13b1c17622aaddda1ecb55d49c8f1bf9777e4d877800a43f8b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -3245,6 +3530,16 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "positioned-io"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4ec4b80060f033312b99b6874025d9503d2af87aef2dd4c516e253fbfcdada7"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "postcard"
 version = "1.1.3"
@@ -3254,6 +3549,7 @@ dependencies = [
  "cobs",
  "embedded-io 0.4.0",
  "embedded-io 0.6.1",
+ "heapless",
  "postcard-derive",
  "serde",
 ]
@@ -3266,7 +3562,7 @@ checksum = "e0232bd009a197ceec9cc881ba46f727fcd8060a2d8d6a9dde7a69030a6fe2bb"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -3322,6 +3618,38 @@ dependencies = [
  "toml_edit",
 ]
 
+[[package]]
+name = "proc-macro-error"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "18f33027081eba0a6d8aba6d1b1c3a3be58cbb12106341c2d5759fcd9b5277e7"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a5b4b77fdb63c1eca72173d68d24501c54ab1269409f6b672c85deb18af69de"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "syn-mid",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.20+deprecated"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc375e1527247fe1a97d8b7156678dfe7c1af2fc075c9a4db3690ecd2a148068"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.106"
@@ -3348,7 +3676,7 @@ checksum = "7347867d0a7e1208d93b46767be83e2b8f978c3dad35f775ac8d8847551d6fe1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -3509,6 +3837,19 @@ dependencies = [
  "rand_core 0.10.1",
 ]
 
+[[package]]
+name = "range-collections"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "861706ea9c4aded7584c5cd1d241cec2ea7f5f50999f236c22b65409a1f1a0d0"
+dependencies = [
+ "binary-merge",
+ "inplace-vec-builder",
+ "ref-cast",
+ "serde",
+ "smallvec",
+]
+
 [[package]]
 name = "rcgen"
 version = "0.13.2"
@@ -3519,8 +3860,31 @@ dependencies = [
  "ring",
  "rustls-pki-types",
  "time",
- "x509-parser",
- "yasna",
+ "x509-parser 0.16.0",
+ "yasna 0.5.2",
+]
+
+[[package]]
+name = "rcgen"
+version = "0.14.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57f6d249aad744e274e682777a50283a225a32705394ee6d5fcc01efa25e4055"
+dependencies = [
+ "pem",
+ "ring",
+ "rustls-pki-types",
+ "time",
+ "x509-parser 0.18.1",
+ "yasna 0.6.0",
+]
+
+[[package]]
+name = "redb"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e925444704b5f17d32bf42f5b6e2df050bceebc3dcd6e71cc73dafe8092e839"
+dependencies = [
+ "libc",
 ]
 
 [[package]]
@@ -3532,6 +3896,38 @@ dependencies = [
  "bitflags 2.13.0",
 ]
 
+[[package]]
+name = "ref-cast"
+version = "1.0.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f354300ae66f76f1c85c5f84693f0ce81d747e2c3f21a45fef496d89c960bf7d"
+dependencies = [
+ "ref-cast-impl",
+]
+
+[[package]]
+name = "ref-cast-impl"
+version = "1.0.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7186006dcb21920990093f30e3dea63b7d6e977bf1256be20c3563a5db070da"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.118",
+]
+
+[[package]]
+name = "reflink-copy"
+version = "0.1.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9dd7ab4af0363d5ccfd2838d782a28196cf32a5cc2e4fe3c5dc83f2be588b8b"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "rustix",
+ "windows",
+]
+
 [[package]]
 name = "regex"
 version = "1.12.4"
@@ -3705,7 +4101,7 @@ checksum = "5d2ed0b54125315fb36bd021e82d314d1c126548f871634b483f46b31d13cac6"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -3758,6 +4154,19 @@ dependencies = [
  "nom",
 ]
 
+[[package]]
+name = "rustix"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6fe4565b9518b83ef4f91bb47ce29620ca828bd32cb7e408f0062e9930ba190"
+dependencies = [
+ "bitflags 2.13.0",
+ "errno",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "rustls"
 version = "0.23.40"
@@ -3892,7 +4301,7 @@ checksum = "1783eabc414609e28a5ba76aee5ddd52199f7107a0b24c2e9746a1ecc34a683d"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -3954,6 +4363,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "self_cell"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b12e76d157a900eb52e81bc6e9f3069344290341720e9178cde2407113ac8d89"
+
 [[package]]
 name = "semver"
 version = "1.0.28"
@@ -4007,7 +4422,7 @@ checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -4156,6 +4571,12 @@ version = "0.3.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "38b58827f4464d87d377d175e90bf58eb00fd8716ff0a62f80356b5e61555d0d"
 
+[[package]]
+name = "siphasher"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ee5873ec9cce0195efcb7a4e9507a04cd49aec9c83d0389df45b1ef7ba2e649"
+
 [[package]]
 name = "slab"
 version = "0.4.12"
@@ -4167,6 +4588,9 @@ name = "smallvec"
 version = "1.15.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ed6a63f02c8539c91a8685a86f4099661ba3da017932f6ebbea6de3f0fa7c90"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "smawk"
@@ -4228,7 +4652,7 @@ checksum = "c87e960f4dca2788eeb86bbdde8dd246be8948790b7618d656e68f9b720a86e8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -4302,7 +4726,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -4339,6 +4763,17 @@ version = "2.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.118"
@@ -4350,6 +4785,17 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "syn-mid"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fea305d57546cc8cd04feb14b62ec84bf17f50e3f7b12560d7bfa9265f39d9ed"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "sync_wrapper"
 version = "1.0.2"
@@ -4367,7 +4813,7 @@ checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -4408,6 +4854,7 @@ dependencies = [
  "futures-util",
  "getrandom 0.4.3",
  "iroh",
+ "iroh-blobs",
  "iroh-gossip",
  "mdns-sd",
  "reqwest 0.12.28",
@@ -4454,7 +4901,7 @@ checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -4465,7 +4912,7 @@ checksum = "ebc4ee7f67670e9b64d05fa4253e753e016c6c95ff35b89b7941d6b856dec1d5"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -4560,7 +5007,7 @@ checksum = "385a6cb71ab9ab790c5fe8d67f1645e6c450a7ce006a33de03daa956cf70a496"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -4726,7 +5173,7 @@ checksum = "7490cfa5ec963746568740651ac6781f701c9c5ea257c58e057f3ba8cf69e8da"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -4870,7 +5317,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "802d2051a700e3ec894c79f80d2705b69d85844dafbbe5d1a92776f8f48b563a"
 dependencies = [
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -4900,7 +5347,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "serde",
- "syn",
+ "syn 2.0.118",
  "toml",
  "uniffi_meta",
 ]
@@ -4913,7 +5360,7 @@ checksum = "4a74ed96c26882dac1ca9b93ca23c827e284bacbd7ec23c6f0b0372f747d59e4"
 dependencies = [
  "anyhow",
  "bytes",
- "siphasher",
+ "siphasher 0.3.11",
  "uniffi_checksum_derive",
 ]
 
@@ -5129,7 +5576,7 @@ dependencies = [
  "bumpalo",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
  "wasm-bindgen-shared",
 ]
 
@@ -5222,7 +5669,7 @@ dependencies = [
  "log",
  "portable-atomic",
  "rand 0.9.4",
- "rcgen",
+ "rcgen 0.13.2",
  "regex",
  "ring",
  "rtcp",
@@ -5474,7 +5921,7 @@ checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -5485,7 +5932,7 @@ checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -5837,18 +6284,36 @@ version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fcbc162f30700d6f3f82a24bf7cc62ffe7caea42c0b2cba8bf7f3ae50cf51f69"
 dependencies = [
- "asn1-rs",
+ "asn1-rs 0.6.2",
  "data-encoding",
- "der-parser",
+ "der-parser 9.0.0",
  "lazy_static",
  "nom",
- "oid-registry",
+ "oid-registry 0.7.1",
  "ring",
  "rusticata-macros",
  "thiserror 1.0.69",
  "time",
 ]
 
+[[package]]
+name = "x509-parser"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d43b0f71ce057da06bc0851b23ee24f3f86190b07203dd8f567d0b706a185202"
+dependencies = [
+ "asn1-rs 0.7.2",
+ "data-encoding",
+ "der-parser 10.0.0",
+ "lazy_static",
+ "nom",
+ "oid-registry 0.8.1",
+ "ring",
+ "rusticata-macros",
+ "thiserror 2.0.18",
+ "time",
+]
+
 [[package]]
 name = "xml-rs"
 version = "0.8.28"
@@ -5873,6 +6338,16 @@ dependencies = [
  "time",
 ]
 
+[[package]]
+name = "yasna"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5f6765e852b9b4dc8e2a76843e4d64d1cea8e79bcde0b6901aea8e7c7f08282"
+dependencies = [
+ "bit-vec",
+ "time",
+]
+
 [[package]]
 name = "yoke"
 version = "0.8.3"
@@ -5892,7 +6367,7 @@ checksum = "de844c262c8848816172cef550288e7dc6c7b7814b4ee56b3e1553f275f1858e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
  "synstructure",
 ]
 
@@ -5913,7 +6388,7 @@ checksum = "1ae7f38b72ec2a254e2b87ef277cf2cd4fb97cbebf944faa6f33354da0867930"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -5933,7 +6408,7 @@ checksum = "11532158c46691caf0f2593ea8358fed6bbf68a0315e80aae9bd41fbade684a1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
  "synstructure",
 ]
 
@@ -5954,7 +6429,7 @@ checksum = "3c50655cbb0fe3fc43170059e702f1ce5e19b84cec58dc87b037a09935c2f328"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
@@ -5987,7 +6462,7 @@ checksum = "625dc425cab0dca6dc3c3319506e6593dcb08a9f387ea3b284dbd52a92c40555"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.118",
 ]
 
 [[package]]
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 6fbba14..ba02fd3 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -34,10 +34,11 @@ getrandom = "0.4.3"
 # the hand-rolled SSE/RTC/LAN stack.
 iroh = { version = "1", optional = true }
 iroh-gossip = { version = "0.101", optional = true }
+iroh-blobs = { version = "0.103", optional = true }
 
 [features]
 default = []
-iroh-transport = ["dep:iroh", "dep:iroh-gossip"]
+iroh-transport = ["dep:iroh", "dep:iroh-gossip", "dep:iroh-blobs"]
 
 [dev-dependencies]
 # Iroh spikes (examples/iroh_*.rs) link iroh directly regardless of the feature.
diff --git a/core/examples/iroh_engine.rs b/core/examples/iroh_engine.rs
index 7041ecb..c90e344 100644
--- a/core/examples/iroh_engine.rs
+++ b/core/examples/iroh_engine.rs
@@ -22,13 +22,18 @@ impl MessageHandler for Noop {
     fn on_file(&self, _n: String, _m: String, _d: Vec<u8>) {}
 }
 
-struct Collector(mpsc::Sender<String>);
+struct Collector {
+    text: mpsc::Sender<String>,
+    file: mpsc::Sender<(String, usize)>,
+}
 impl MessageHandler for Collector {
     fn on_message(&self, m: Message) {
-        let _ = self.0.send(m.text);
+        let _ = self.text.send(m.text);
     }
     fn on_status(&self, _c: bool) {}
-    fn on_file(&self, _n: String, _m: String, _d: Vec<u8>) {}
+    fn on_file(&self, name: String, _mime: String, data: Vec<u8>) {
+        let _ = self.file.send((name, data.len()));
+    }
 }
 
 fn main() {
@@ -61,28 +66,52 @@ fn main() {
 
     // Joiner (bootstraps to A via the env var its IrohTransport reads at start).
     let (tx, rx) = mpsc::channel();
+    let (ftx, frx) = mpsc::channel();
     let b = Engine::new(
         server.into(), room.into(), "iroh-b".into(), "ios".into(), "B".into(), account.into(),
     );
-    b.start(Box::new(Collector(tx)));
+    b.start(Box::new(Collector { text: tx, file: ftx }));
 
     eprintln!("waiting for gossip topic to form…");
     std::thread::sleep(Duration::from_secs(8));
 
+    // 1) Text clipboard over gossip.
     let payload = "clipboard synced over iroh 🎉";
-    eprintln!("A sending: {payload:?}");
+    eprintln!("A sending text: {payload:?}");
     a.send(payload.to_string());
-
     match rx.recv_timeout(Duration::from_secs(10)) {
         Ok(t) if t == payload => {
-            println!("✅ engine-over-iroh: B received {t:?} (E2E-decrypted, via gossip, no relay/SSE/RTC/LAN)");
+            println!("✅ text: B received {t:?} (E2E-decrypted, via gossip)");
+        }
+        Ok(t) => {
+            println!("⚠️  B got {t:?} (expected {payload:?})");
+            std::process::exit(1);
         }
-        Ok(t) => println!("⚠️  B got {t:?} (expected {payload:?})"),
         Err(_) => {
-            println!("❌ B received nothing — gossip topic may not have formed");
+            println!("❌ B received no text");
             std::process::exit(1);
         }
     }
+
+    // 2) A "photo"/blob over iroh-blobs (announced via gossip, fetched P2P).
+    let photo: Vec<u8> = (0..200_000u32).map(|i| (i % 251) as u8).collect();
+    eprintln!("A sending blob: photo.bin ({} bytes)", photo.len());
+    a.send_file("photo.bin".into(), "image/png".into(), photo.clone());
+    match frx.recv_timeout(Duration::from_secs(15)) {
+        Ok((name, len)) if len == photo.len() => {
+            println!("✅ blob: B received {name:?} ({len} bytes, E2E-decrypted, via iroh-blobs)");
+        }
+        Ok((name, len)) => {
+            println!("⚠️  B got {name:?} with {len} bytes (expected {})", photo.len());
+            std::process::exit(1);
+        }
+        Err(_) => {
+            println!("❌ B received no blob");
+            std::process::exit(1);
+        }
+    }
+
+    println!("🎉 engine-over-iroh: text + photo synced, no SSE/RTC/LAN/relay");
     a.stop();
     b.stop();
 }
diff --git a/core/src/iroh.rs b/core/src/iroh.rs
index d18c8f8..55e2d86 100644
--- a/core/src/iroh.rs
+++ b/core/src/iroh.rs
@@ -1,7 +1,8 @@
 //! IrohTransport — the Mesh, on iroh. The end state of M4: this one transport
 //! subsumes the hand-rolled SSE/RTC/LAN stack. iroh handles key-addressing,
 //! holepunch, and relay; `iroh-gossip` carries the clipboard `Message`s and
-//! presence over the account-derived topic.
+//! presence; `iroh-blobs` carries files/photos/data (content-addressed, fetched
+//! P2P on demand) — replacing the hand-rolled M/C/E frame protocol.
 //!
 //! It implements the same `Transport` trait and emits the same `MeshEvent`s as
 //! the legacy transports, so the engine event loop and every client are
@@ -9,38 +10,64 @@
 //!
 //! Bootstrap note (v1): joining the gossip topic needs ≥1 peer id. Until the
 //! rendezvous supernode lands (see ARCHITECTURE §M3), bootstrap ids come from
-//! the `TETHER_IROH_BOOTSTRAP` env var (comma-separated). That's the one
-//! stopgap; everything else is production-shaped.
+//! the `TETHER_IROH_BOOTSTRAP` env var (comma-separated).
 
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex as StdMutex};
 
 use futures_util::TryStreamExt;
 use iroh::{endpoint::presets, protocol::Router, Endpoint, EndpointId};
+use iroh_blobs::{store::mem::MemStore, BlobsProtocol, Hash};
 use iroh_gossip::{
     api::{Event, GossipSender},
     net::{Gossip, GOSSIP_ALPN},
     proto::TopicId,
 };
+use serde::{Deserialize, Serialize};
 use tokio::runtime::Handle;
 
 use crate::{Config, EventTx, MeshEvent, Message, Transport};
 
+/// Blob handles needed by `send_file` / blob downloads, set once online.
+#[derive(Clone)]
+struct Blobs {
+    store: MemStore,
+    endpoint: Endpoint,
+    my_id: String,
+}
+
 pub(crate) struct IrohTransport {
     cfg: Config,
     events: EventTx,
     /// Set once the gossip topic is joined; used by `publish`.
     sender: Arc<StdMutex<Option<GossipSender>>>,
+    /// Blob store + endpoint, set once online; used by `send_file` and downloads.
+    blobs: Arc<StdMutex<Option<Blobs>>>,
     /// This node's iroh EndpointId, surfaced once online (for bootstrap wiring).
     id: Arc<StdMutex<Option<String>>>,
 }
 
 impl IrohTransport {
     pub(crate) fn new(cfg: Config, events: EventTx, id: Arc<StdMutex<Option<String>>>) -> Self {
-        Self { cfg, events, sender: Arc::new(StdMutex::new(None)), id }
+        Self {
+            cfg,
+            events,
+            sender: Arc::new(StdMutex::new(None)),
+            blobs: Arc::new(StdMutex::new(None)),
+            id,
+        }
     }
 }
 
+/// A blob announcement, broadcast over gossip so peers can fetch the bytes P2P.
+#[derive(Serialize, Deserialize)]
+struct BlobAnnounce {
+    hash: String,     // blake3 hash of the (sealed) bytes
+    name: String,
+    mime: String,
+    provider: String, // the sender's iroh EndpointId to download from
+}
+
 /// account/room → 32-byte gossip topic (consistent with room_for_account: the
 /// room is already sha256(account)[..4], this is the full-width derivation).
 fn topic_for(room: &str) -> TopicId {
@@ -62,6 +89,34 @@ fn bootstrap_ids() -> Vec<EndpointId> {
         .collect()
 }
 
+impl IrohTransport {
+    /// Fetch a blob announced over gossip from its provider and surface it.
+    async fn fetch_blob(blobs: Blobs, events: EventTx, ann: BlobAnnounce) {
+        let (Ok(hash), Ok(provider)) =
+            (ann.hash.parse::<Hash>(), ann.provider.parse::<EndpointId>())
+        else {
+            return;
+        };
+        let downloader = blobs.store.downloader(&blobs.endpoint);
+        if let Err(e) = downloader.download(hash, Some(provider)).await {
+            eprintln!("tethercore[iroh]: blob download failed: {e}");
+            return;
+        }
+        match blobs.store.get_bytes(hash).await {
+            Ok(bytes) => {
+                eprintln!("tethercore[iroh]: fetched blob {:?} ({} bytes)", ann.name, bytes.len());
+                // Bytes are still sealed; the engine's File handler decrypts.
+                let _ = events.send(MeshEvent::File {
+                    name: ann.name,
+                    mime: ann.mime,
+                    data: bytes.to_vec(),
+                });
+            }
+            Err(e) => eprintln!("tethercore[iroh]: blob read failed: {e}"),
+        }
+    }
+}
+
 impl Transport for IrohTransport {
     fn name(&self) -> &'static str {
         "iroh"
@@ -87,9 +142,17 @@ impl Transport for IrohTransport {
             eprintln!("tethercore[iroh]: online id={my_id}");
 
             let gossip = Gossip::builder().spawn(endpoint.clone());
+            let store = MemStore::new();
+            let blobs_proto = BlobsProtocol::new(&store, None);
             let router = Router::builder(endpoint.clone())
                 .accept(GOSSIP_ALPN, gossip.clone())
+                .accept(iroh_blobs::ALPN, blobs_proto)
                 .spawn();
+            *this.blobs.lock().unwrap() = Some(Blobs {
+                store: store.clone(),
+                endpoint: endpoint.clone(),
+                my_id: my_id.clone(),
+            });
 
             let topic = topic_for(&this.cfg.room);
             let sub = match gossip.subscribe_and_join(topic, bootstrap_ids()).await {
@@ -107,10 +170,22 @@ impl Transport for IrohTransport {
             while running.load(Ordering::SeqCst) {
                 match receiver.try_next().await {
                     Ok(Some(Event::Received(msg))) => {
-                        if let Ok(m) = serde_json::from_slice::<Message>(&msg.content) {
-                            if m.from != this.cfg.from {
-                                let _ = this.events.send(MeshEvent::Message(m));
+                        let Ok(m) = serde_json::from_slice::<Message>(&msg.content) else {
+                            continue;
+                        };
+                        if m.from == this.cfg.from {
+                            continue; // our own broadcast
+                        }
+                        if m.kind == "blob" {
+                            // File announcement → fetch the bytes P2P, then emit File.
+                            if let Ok(ann) = serde_json::from_str::<BlobAnnounce>(&m.text) {
+                                if let Some(blobs) = this.blobs.lock().unwrap().clone() {
+                                    let events = this.events.clone();
+                                    tokio::spawn(Self::fetch_blob(blobs, events, ann));
+                                }
                             }
+                        } else {
+                            let _ = this.events.send(MeshEvent::Message(m));
                         }
                     }
                     Ok(Some(Event::NeighborUp(id))) => {
@@ -119,8 +194,8 @@ impl Transport for IrohTransport {
                     Ok(Some(Event::NeighborDown(id))) => {
                         let _ = this.events.send(MeshEvent::DirectDown(id.to_string()));
                     }
-                    Ok(Some(_)) => {}        // Lagged, etc.
-                    Ok(None) => break,       // stream ended
+                    Ok(Some(_)) => {}  // Lagged, etc.
+                    Ok(None) => break, // stream ended
                     Err(e) => {
                         eprintln!("tethercore[iroh]: recv error: {e}");
                         break;
@@ -147,4 +222,43 @@ impl Transport for IrohTransport {
             });
         }
     }
+
+    /// Add the (already-sealed) bytes to the local blob store and broadcast a
+    /// blob announcement over gossip; peers fetch the bytes P2P by hash.
+    fn send_file(&self, rt: &Handle, _id: String, name: String, mime: String, data: Vec<u8>) {
+        let blobs = self.blobs.lock().unwrap().clone();
+        let sender = self.sender.lock().unwrap().clone();
+        let cfg = self.cfg.clone();
+        let (Some(blobs), Some(sender)) = (blobs, sender) else {
+            return;
+        };
+        rt.spawn(async move {
+            let tag = match blobs.store.add_slice(&data).await {
+                Ok(t) => t,
+                Err(e) => {
+                    eprintln!("tethercore[iroh]: blob add failed: {e}");
+                    return;
+                }
+            };
+            let ann = BlobAnnounce {
+                hash: tag.hash.to_string(),
+                name,
+                mime,
+                provider: blobs.my_id.clone(),
+            };
+            let msg = Message {
+                kind: "blob".into(),
+                text: serde_json::to_string(&ann).unwrap_or_default(),
+                from: cfg.from.clone(),
+                to: String::new(),
+                role: String::new(),
+                source: cfg.source.clone(),
+                room: cfg.room.clone(),
+                ts: 0,
+            };
+            if let Ok(body) = serde_json::to_vec(&msg) {
+                let _ = sender.broadcast(body.into()).await;
+            }
+        });
+    }
 }