I hereby claim:
- I am mthierry on github.
- I am mthierry (https://keybase.io/mthierry) on keybase.
- I have a public key whose fingerprint is 304F 8695 1D45 A718 CBC1 11EB 388B 137A AC67 6C48
To claim this, I am signing this object:
{
    "body": {
        "key": {
            "fingerprint": "304f86951d45a718cbc111eb388b137aac676c48",
            "host": "keybase.io",
            "key_id": "388b137aac676c48",
            "uid": "2897f77a0cbba867c29a5a4756073200",
            "username": "mthierry"
        },
        "service": {
            "name": "github",
            "username": "mthierry"
        },
        "type": "web_service_binding",
        "version": 1
    },
    "ctime": 1400357134,
    "expire_in": 157680000,
    "prev": "6cdbd7c991de9eabb2ff3e05957d174c31a33d5eee277b6624c7aa8e84f5c1cb",
    "seqno": 3,
    "tag": "signature"
}with the PGP key whose fingerprint is
304F 8695 1D45 A718 CBC1  11EB 388B 137A AC67 6C48
(captured above as body.key.fingerprint), yielding the PGP signature:
-----BEGIN PGP MESSAGE-----
Version: Keybase OpenPGP v0.1.15
Comment: https://keybase.io/crypto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=oK/J
-----END PGP MESSAGE-----
And finally, I am proving ownership of the github account by posting this as a gist.
Consider the keybase command line program.
# look me up
keybase id mthierry
# encrypt a message to me
keybase encrypt mthierry -m 'a secret message...'
# ...and more...