Certificate chain

 0 s:/CN=le-def.smlabs.net
   i:/C=US/O=Let's Encrypt/CN=R3

 1 s:/C=US/O=Let's Encrypt/CN=R3
   i:/C=US/O=Internet Security Research Group/CN=ISRG Root X1

 2 s:/C=US/O=Internet Security Research Group/CN=ISRG Root X1
   i:/O=Digital Signature Trust Co./CN=DST Root CA X3