consensus-specs/tests/formats/kzg_4844/verify_blob_kzg_proof.md

Test format: Verify blob KZG proof

Use the blob KZG proof to verify that the KZG commitment for a given blob is correct

Test case format

The test data is declared in a data.yaml file:

input:
  blob: Blob -- the data blob
  commitment: KZGCommitment -- the KZG commitment to the data blob
  proof: KZGProof -- The KZG proof
output: bool -- true (valid proof) or false (incorrect proof)

• blob here is encoded as a string: hexadecimal encoding of 4096 * 32 = 131072 bytes, prefixed with 0x.

All byte(s) fields are encoded as strings, hexadecimal encoding, prefixed with 0x.

Condition

The verify_blob_kzg_proof handler should verify that commitment is a correct KZG commitment to blob by using the blob KZG proof proof, and the result should match the expected output. If the commitment or proof is invalid (e.g. not on the curve or not in the G1 subgroup of the BLS curve) or blob is invalid (e.g. incorrect length or one of the 32-byte blocks does not represent a BLS field element), it should error, i.e. the output should be null.