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+# Phase One
+
+First step is to make something with some nice "shock-value", benchmarks, etc. With no changes to the p2p layer, only the assume-valid version of SwiftSync is possible. This restricts the feature set to:
+
+- [x] Use kernel to download the block header chain to the assume-valid height
+- [x] Build a hintfile that clients can parse
+- [x] Use a hintfile to determine if one should update an accumulator or add a UTXO
+- [x] Download blocks in parallel
+- [ ] Add coins to Bitcoin Core (kernel)
+- [ ] Start `bitcoind` in pruned mode
+
+To complete this we need(ed) from kernel:
+- [x] Process new block headers
+- [x] `HaveCoin` to generate the hintfile
+- [ ] `AddCoin` to bypass `ProcessBlock`
+
+# Phase Two
+
+Next, some changes are required to move beyond assume-valid.
+
+Patches to Bitcoin Core:
+- [ ] Send undo-data over the p2p layer for parallel validation (and batch validation)
+- [ ] Create a hintfile from Bitcoin Core
+
+Additions to SwiftSync:
+- [ ] Validate blocks
+- [ ] Write blocks to kernel
+
+Additions to kernel:
+- [ ] Write blocks without `ProcessBlock`
+