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fix: align MaxBlobSize with Piri DefaultMaxPaddedSize #65

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fix: align MaxBlobSize with Piri DefaultMaxPaddedSize #65

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3e1d8f4
fix: align MaxBlobSize with Piri DefaultMaxPaddedSize
alanshaw Sep 1, 2026
eb2ac10
refactor: history is in git
alanshaw Sep 1, 2026
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12 changes: 11 additions & 1 deletion commands/blob/allocate.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,16 @@ import (
"github.com/fil-forge/ucantone/ucan/command"
)

const MaxBlobSize = 268_435_456
// MaxBlobSize is the network-wide ceiling on a single blob, in bytes, as
// shipped to a storage node: the most raw bytes a default-configured piri
// accepts in one piece. Piri's default piece ceiling is a 256 MiB PADDED
// piece (piri pkg/pdp/piecesize, DefaultMaxPaddedSize), and Fr32 padding
// leaves 127/128 of it for data — 266338304 (~254 MiB). Piri's piece config
// is raise-only (an operator may accept more, never less), so a client
// sharding uploads at this constant is safe against every conforming node.
//
// This measures the stored artifact. An encrypting client must choose its
// plaintext split below this, leaving room for its envelope framing.
const MaxBlobSize = (256 << 20) * 127 / 128

var Allocate = binding.Bind[*AllocateArguments, *AllocateOK](command.MustParse("/blob/allocate"))