{ "custom_priv_key": { "crv": "P-256", "d": "uR_Jq6LjMgp8DVtE7pKguttNo6L239aEcijzGOr5C70", "kty": "EC", "use": "sig", "x": "_za6DQEnUxqOm0vK9Pgvt9GHBtFi1XIVrPvfQ5zq90k", "y": "mhqW_r-kI0hWvAW_cqQmyaxlRs02bF4w-v4iV8YY-DQ", "kid": "8" } }