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История изменений

Исправление intelfx, (текущая версия) :

Вот описание от LE, они здесь всё рассказывают (https://letsencrypt.org/certificates/):

Our intermediate “Let’s Encrypt Authority X3” represents a single public/private key pair. The private key of that pair generates the signature for all end-entity certificates (also known as leaf certificates), i.e. the certificates we issue for use on your server.

Our intermediate is signed by ISRG Root X1. However, since we are a very new certificate authority, ISRG Root X1 is not yet trusted in most browsers. In order to be broadly trusted right away, our intermediate is also cross-signed by another certificate authority, IdenTrust, whose root is already trusted in all major browsers. Specifically, IdenTrust has cross-signed our intermediate using their DST Root CA X3.

That means there are two certificates available that both represent our intermediate. One is signed by DST Root CA X3, and the other is signed by ISRG Root X1. The easiest way to distinguish the two is by looking at their Issuer field.

tl;dr: разные корни — разные сертификаты. Сертификат — это ребро на графе доверия между ключами:

https://letsencrypt.org/certs/isrg-keys.png

Исходная версия intelfx, :

Вот описание от LE, они здесь всё рассказывают (https://letsencrypt.org/certificates/):

Our intermediate “Let’s Encrypt Authority X3” represents a single public/private key pair. The private key of that pair generates the signature for all end-entity certificates (also known as leaf certificates), i.e. the certificates we issue for use on your server.
Our intermediate is signed by ISRG Root X1. However, since we are a very new certificate authority, ISRG Root X1 is not yet trusted in most browsers. In order to be broadly trusted right away, our intermediate is also cross-signed by another certificate authority, IdenTrust, whose root is already trusted in all major browsers. Specifically, IdenTrust has cross-signed our intermediate using their DST Root CA X3.
That means there are two certificates available that both represent our intermediate. One is signed by DST Root CA X3, and the other is signed by ISRG Root X1. The easiest way to distinguish the two is by looking at their Issuer field.

tl;dr: разные корни — разные сертификаты. Сертификат — это ребро на графе доверия между ключами:

https://letsencrypt.org/certs/isrg-keys.png