## MARF inclusion proof `GET /v1/proofs/marf/{path}` A value and its MARF inclusion proof as of block `tip`, from the node (`/v2/clarity/marf/{path}?proof=1`). Keys the node cannot serve because they hold no stored value string, such as the MARF's own `__MARF_BLOCK_HEIGHT_TO_HASH::`, are proven by the proof sidecar from the MARF itself: same proof bytes, and `data` is the raw 40-byte leaf value. Fold the proof to a root and compare it with `tip`'s `state_index_root`. Inclusion only: a missing key is a 404, not a proof of absence. Free and keyless: never metered, no account needed. Hosted limits: 10 requests per second per IP (1 for witnesses), or 20 (2) per account with a key. Bytes are passed through unchanged; verify them, do not trust them. ### Path parameters | Name | Type | Description | | --- | --- | --- | | `path` | string, required | The MARF key hash: 64 hex characters, `0x` optional. | ### Query parameters | Name | Type | Description | | --- | --- | --- | | `tip` | string, required | `index_block_hash` of the block to prove against, 64 hex characters, `0x` optional. Pinned, so the answer is immutable. | ### Returns One `MarfProof` object. ### Responses - `200` The value and its proof - `400` A path or query parameter is malformed (`VALIDATION_ERROR`): hashes must be exact-length hex, heights non-negative integers - `401` This bind requires the instance token, and it was missing or wrong - `404` No value at that path as of `tip` - `429` Rate limited; retry after `Retry-After` seconds - `502` The node or proof sidecar could not be reached, or answered with an unexpected status (`PROOF_SOURCE_ERROR`) ### Example ```bash curl -G https://api.secondlayer.tools/v1/proofs/marf/5c8d9e1f6c1e0f4a2a6a7f0b0f5f1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b \ -H "Authorization: Bearer $SECONDLAYER_API_KEY" \ -d tip=990152a894e12288960c8b68e5790ad7994f9d261e9ad8adc13c72e76f914339 ``` ```json { "data": "0x0100000000000000000000000000000064", "proof": "0x00…" } ```