merkle/block

https://keybase.io/_/api/1.0/merkle/block.json

hash : "c9e6dd2"

{
  "status": {
    "code": 0,
    "name": "OK"
  },
  "hash": "c9e6dd2ead7218258fffa150b...",
  "value": {
    "tab": {
      "00": "d70b05a791acae2c6072d5bf3086b26...",
      "01": "92a4ff6f918d257f06f1eb5c296d86e...",
      "02": "2a7d1e7e3cafed7146eebf0d60c0d05...",
      "03": "12e4e169bcbe0a42500677902a95c95...",
      "04": "6e57ba5f779aa825762d1da47de4879...",
      "05": "02ad26b594b431b0bd331781065350d...",
      "06": "119e58ac656977c5d2edc296d5ca17c...",
      "07": "cc2e1ae9a976a5fc824a258d4c006ab...",
      ...
    },
    "type": 1
  },
  "value_string": "{\"tab\":{\"00\":\"d70b05a...\"}"
  "ctime": "2014-04-23T21:29:33.000Z",
  "type": 1
}

merkle/block

Given a hash, lookup the block that hashes to it. Useful for looking up interior nodes in the Merkle Tree.

SHA-512 is used for all Merkle-tree hashes. Hashes computed over JSON objects assume no unneeeded interior spacing, and that object keys are sorted in hexadecimal order.

Provide as input any prefix of the desired hash, as long as it's not ambiguous. You can of course also provide the entire hash.

Blocks of type 1 are interior nodes. Blocks of type 2 are leaf nodes, which contain lists mapping user IDs to a pair, containing (0) the highest sequence number in their signature chain; and (1) the SHA-256 hash of the last signature in their chain.

Interior nodes are split on substrings of the desired user ID. To find user ID 07d5cd6dcedb1fa03408e792d0fdc300 in this example tree, we'd first get the root (c9e6dd2...) via merkle/root, then lookup its block via this endpoint, then follow the path given by value.tab.07, and then recursively continue by looking up cc2e1ae....

To check that the block hashes to the right key, you can either re-json-stringify the given value field, or hash the specified value_string, which has been stringified according to the canonical stringification.