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Checksum Extension Specification

  • Title: Checksum
  • Identifier: checksum
  • Field Name Prefix: checksum
  • Scope: Item, Catalog, Collection
  • Extension Maturity Classification: Proposal

Provides a way to specify file checksums (e.g. BLAKE2, MD5, SHA1, SHA2, SHA3) for assets and links in STAC Items, STAC Catalogs and STAC Collections. The hashes are self-identifying hashes as described in the Multihash specification.

Link Object and Asset Object fields

Field Name Type Description
checksum:multihash string Multihash for the corresponding file, encoded as hexadecimal (base 16) string with lowercase letters.

Examples

Checksum for a text file with file content test.

Field Name Algorithm Example
checksum:multihash sha1 (160 bits) 1114a94a8fe5ccb19ba61c4c0873d391e987982fbbd3
checksum:multihash sha2 (256 bits) 12209f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08
checksum:multihash sha2 (256 bits truncated to 160 bits) 12149f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b
checksum:multihash blake2b-128 90e4021044a8995dd50b6657a037a7839304535b

Implementations

None yet, still in proposal stage.