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toBlobSidecars

Transforms arbitrary data (or blobs, commitments, & proofs) into a blob sidecar array.

Import

import { toBlobSidecars } from 'viem'

Usage

With Arbitrary Data

You can generate blob sidecars from arbitrary data without having to compute the blobs, commitments, and proofs first (that's done internally).

example.ts
import { toBlobSidecars } from 'viem'
import { kzg } from './kzg'
 
const sidecars = toBlobSidecars({ data: '0x...', kzg })

With Blobs, Commitments, and Proofs

Alternatively, you can reach for the lower-level API and insert the blobs, commitments, and proofs directly.

example.ts
import { 
  blobsToCommitments, 
  blobsToProofs,
  toBlobSidecars, 
  toBlobs 
} from 'viem'
import { kzg } from './kzg'
 
const blobs = toBlobs({ data: '0x...' })
const commitments = blobsToCommitments({ blobs, kzg })
const proofs = blobsToProofs({ blobs, commitments, kzg })
const sidecars = toBlobSidecars({ blobs, commitments, proofs })

Returns

BlobSidecars

Blob sidecars from the input data.

Parameters

blobs

  • Type: Hex[] | ByteArray[]

Blobs to transform into blob sidecars.

import { 
  blobsToCommitments, 
  blobsToProofs,
  toBlobSidecars, 
  toBlobs 
} from 'viem'
import { kzg } from './kzg'
 
const blobs = toBlobs({ data: '0x...' }) 
const commitments = blobsToCommitments({ blobs, kzg })
const proofs = blobsToProofs({ blobs, commitments, kzg })
 
const sidecars = toBlobSidecars({ 
  blobs, 
  commitments,
  proofs,
})

commitments

  • Type: Hex[] | ByteArray[]

Commitments corresponding to the input blobs.

import { 
  blobsToCommitments, 
  blobsToProofs,
  toBlobSidecars, 
  toBlobs 
} from 'viem'
import { kzg } from './kzg'
 
const blobs = toBlobs({ data: '0x...' })
const commitments = blobsToCommitments({ blobs, kzg }) 
const proofs = blobsToProofs({ blobs, commitments, kzg })
 
const sidecars = toBlobSidecars({ 
  blobs,
  commitments, 
  proofs,
})

data

  • Type: Hex | ByteArray

Data to transform into blob sidecars.

import { toBlobSidecars } from 'viem'
import { kzg } from './kzg'
 
const sidecars = toBlobSidecars({ 
  data: '0x...', 
  kzg,
})

kzg

  • Type: KZG

KZG implementation. See setupKzg for more information.

import * as kzg from 'c-kzg'
import { toBlobSidecars, setupKzg } from 'viem'
import { mainnetTrustedSetupPath } from 'viem/node'
 
const kzg = setupKzg(cKzg, mainnetTrustedSetupPath) 
 
const sidecars = toBlobSidecars({ 
  data: '0x...',
  kzg, 
})

proofs

  • Type: Hex[] | ByteArray[]

Proofs corresponding to the input blobs.

import { 
  blobsToCommitments, 
  blobsToProofs,
  toBlobSidecars, 
  toBlobs 
} from 'viem'
import { kzg } from './kzg'
 
const blobs = toBlobs({ data: '0x...' })
const commitments = blobsToCommitments({ blobs, kzg })
const proofs = blobsToProofs({ blobs, commitments, kzg }) 
 
const sidecars = toBlobSidecars({ 
  blobs,
  commitments,
  proofs, 
})

to

  • Type: "bytes" | "hex"

The output type.

import { toBlobSidecars, toBlobs } from 'viem'
 
const sidecars = toBlobSidecars({ 
  data: '0x1234',
  kzg, 
  to: 'bytes', 
}) 
 

const sidecars: BlobSidecars<Uint8Array>
sidecars