Resume a signed Arweave upload with the original bytes
The arweave-js uploader persists progress separately from the payload. A resumable upload needs both the serialized uploader and the exact original data.
Preserve a byte-stable input
Suppose an application uploads a generated JSON export. Keep the exact encoded file next to the upload checkpoint. Regenerating JSON from a database can change property order or whitespace. The reference uploader rebuilds the chunk structure and compares its data root with the signed transaction when it reconstructs a serialized upload.
checkpoint = serialized uploader for signed transaction T
resume input = original bytes D
verify recalculated data_root against T before continuing
Resume and reconcile progress
If the root differs, locate the archived original bytes. Changing the checkpoint to match a new file would sever its link to the signed transaction. After the uploader finishes, check the transaction status and read back the intended content. Upload completion alone does not establish confirmations.