SOURCES of the files under /stems/ (zeromile.tools, the song splitter at /split/)
The files under /stems/v1/ never change; a new version of any of them goes into a new folder (/stems/v2/).

/stems/v1/models/spleeter-4stems.fp16.onnx   78,889,267 bytes  sha256 8de1faa49e25030da839073e777f426356aaa039f4cb9d204430a0f56fbaed31
/stems/v1/models/spleeter-5stems.fp16.onnx   98,612,037 bytes  sha256 e6c4ce98e4bc77bfa8b508d9b6128d5f143fc587ffe3e85d37e360e3d98e2f2b
  Made by Zero Mile Contract Limited on 2026-10-05 from Deezer's release files (our conversion script is not
  published here):
  https://github.com/deezer/spleeter/releases/download/v1.4.0/4stems.tar.gz
      146,308,147 bytes, sha256 3adb4a50ad4eb18c7c4d65fcf4cf2367a07d48408a5eb7d03cd20067429dfaa8
  https://github.com/deezer/spleeter/releases/download/v1.4.0/5stems.tar.gz
      182,803,368 bytes, sha256 25a1e87eb5f75cc72a4d2d5467a0a50ac75f05611f877c278793742513cc7218
  (both checksums equal Deezer's own checksum.json of that release). They hold Deezer's trained weights and a graph
  written from Deezer's model definition (spleeter/model/functions/unet.py, MIT); no file of any third-party
  conversion was used. Convolution kernels are stored in half precision except the first and the last three
  layers; the arithmetic is full precision. Checked against Deezer's own saved graph run in TensorFlow:
  4 parts -69 to -81 dB, 5 parts -57 to -81 dB difference.

/stems/v1/ort/ (ort.wasm.min.mjs, ort-wasm-simd-threaded.mjs, ort-wasm-simd-threaded.wasm, ort.webgpu.min.mjs,
  ort-wasm-simd-threaded.asyncify.mjs, ort-wasm-simd-threaded.asyncify.wasm)
  Unchanged copies from the npm package onnxruntime-web 1.30.0 (Microsoft, MIT): https://www.npmjs.com/package/onnxruntime-web
  The two .wasm files were built by Microsoft with Emscripten 4.0.23. How found: tag v1.30.0 of
  github.com/microsoft/onnxruntime pins its emsdk submodule (.gitmodules "branch = 4.0.23", commit c0bb220c,
  which is emsdk's tag 4.0.23) and its build template runs "./emsdk install 4.0.23"; the files themselves
  carry no version text. Emscripten links its own runtime, musl, compiler-rt, libc++, libc++abi and dlmalloc
  into both; their licence texts in /stems/NOTICES.txt section 3 were fetched on 2026-10-06 from:
  https://raw.githubusercontent.com/emscripten-core/emscripten/4.0.23/LICENSE
      5,093 bytes, sha256 620a78084fc7ca97c0b5dea9abf891f3ffcadfdbf305276f099c9c4e12fc1d86
  https://raw.githubusercontent.com/emscripten-core/emscripten/4.0.23/system/lib/libc/musl/COPYRIGHT
      6,204 bytes, sha256 f9bc4423732350eb0b3f7ed7e91d530298476f8fec0c6c427a1c04ade22655af
      (equal to https://git.musl-libc.org/cgit/musl/plain/COPYRIGHT?h=v1.2.5, fetched the same day)
  https://raw.githubusercontent.com/emscripten-core/emscripten/4.0.23/system/lib/compiler-rt/LICENSE.TXT
      16,708 bytes, sha256 1a8f1058753f1ba890de984e48f0242a3a5c29a6a8f2ed9fd813f36985387e8d
  https://raw.githubusercontent.com/emscripten-core/emscripten/4.0.23/system/lib/libcxx/LICENSE.TXT
      16,703 bytes, sha256 539dd7aed86e8a4f12cbdd0e6c50c189c7d74847e4fecc64ce2c6ee3a01da38b
  https://raw.githubusercontent.com/emscripten-core/emscripten/4.0.23/system/lib/libcxxabi/LICENSE.TXT
      16,706 bytes, sha256 e2b35be49f7284a45b7baca8fc7b3ab7440e7902392b2528a457816b5bb2a15c
      (the three LLVM texts are equal to the same files of github.com/llvm/llvm-project, tag llvmorg-20.1.8)
  https://raw.githubusercontent.com/emscripten-core/emscripten/4.0.23/system/lib/dlmalloc.c
      236,568 bytes, sha256 c008dc3c2b005ba822efb1bf6187a9d7a6aecd096826c6f28c6f5ee62885053d (lines 52 to 60 used)

/split-engine/split-worker.js, /split-engine/spleeter.mjs
  Written by Zero Mile Contract Limited (the page's worker and the signal path around the model). They are not
  under /stems/: they ship with every release of the site, so a fix to them needs no new folder.

/stems/v1/demo/pull-it-apart.mp3   3,026,208 bytes  sha256 3b1e7d2825a980b6492c251db9e1a3e8e2a04903e281ee678890243c8d767948
  Demo song "Pull It Apart", made by Zero Mile with Suno on 2026-10-05 on a paid plan, https://suno.com/s/VDOcT7dtxhDoC90M
  The tags that the MP3 came with (title, account name, comment, lyrics, cover picture) were removed from the file
  on 2026-10-06; the sound is unchanged (the same MP3 frames, bit for bit).