JWT verification

Please, can you tell me how you know that from this
{
“kty”: “RSA”,
“alg”: “RS256”,
“kid”: “3oDgmHEmsSlHoKqdn1ZRslGFAbfrZ83r6O8qWmaV0Jg”,
“use”: “sig”,
“e”: “AQAB”,
“n”: “ldbRkBzVMiUbWEHYNpnHEuR0xx6mU_UDWcAcaqkN-69eJRXF_kojJhZgaj6XW_VdbX4P9adahohRF1N6VfqTgEjiUMacNAcKbaC4UNswUvezyH-L1AWSw2qijU0_MAOVbpKym3c0Phur7v26Jjo-nOmh6U19bFImaoEkK2KTy4sG4jDHlH0DGPTBGd_DIZL6edwu_P1D0NhRZpCvHppKIEhJayUPvkz2yZcVPaNwewzXgw91jCe9G95AiTkFivqx1XPfSU1szsXZ4ZILgqcb_Yjv6r16Bmu6_sktXxAvuQQgATJ5TOVLTcsl6pWGC01hZ5jPr8BAnj-3U6yaJpnQoQ”
}

the key is what you wrote? I’m trying to recalculate the key without success :frowning: