Note: Many users reported that my public key was invalid, even though it was actually valid. When verifying the signature, if you receive an error message stating that the signing key is invalid, you need to sign my public key with your private key first (then the error message will no longer appear).
In other words, the "Invalid Key" error message does NOT mean that my key is actually invalid (you just need to sign the key, after you add it to your keyring, in order to mark the key as trusted). That's how PGP and GPG work.
I'm pasting the public key here, just in case you can't get it from the keyserver.
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.1.0
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t5msiQwKq2KLo7zGO356OIcDzVEXNSAmPqZpgaVlwxqYnmN5xO+lOq6YT1pinI0TbELaIybJ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s848ZS0kCk0cpuQchbxtgAFLWDHI4++n0e9UB3QXW4saL+oMqaDRcLfT9iYudGqLx+vYBL3H
jMYWknyOq/sYE5SlQQah83/WlXIND9THvd93uXc/eyPH85vOq+rjt4/9LoAqMVoBCtoMxO/6
1L3eh4bM66yl2wEowtPtwjH5c1cV1Q/OucEvVwqTluNzJ6IXfBNt6VZAX0HCR6y74NYbtfkZ
Js+q95bUHKG8ybWvRmeW9PMRZ5G3VQtp48BV77ft0MYdv1Akibq2BeiXuCKkdr3BhxN/+372
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6eB9pHnz6Zgi4TOUf4BLoFWbHvA9MWHZZ6dVo1F8AXaTYZwzDREkqS2lIgvjd9LjbyOAQH8J
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uy0cXNY4OlWUi5BZ1zEBXVuoOp9FgirEzlDPEd6ktWYCqR7HNP8reLTTaRMQFULnUBkNST2N
ItFwxNIar50I4qyuuiP9sBYSeAeVpC7SRu6N7KVcEgCemU/YHwnYxAApYJyCKyYqpI98GZ+i
Ixzg/AQdN2ThRM+7fo2/8XDpCdQ/HvFmz2feELRtdNX6Tp/HnrDZkwLROf90ihtdSm1/Z7BS
wRtqRXZm08KGGnej+kvyIYGAfGXVhm+ZdA2PoMoM2qdcgSlOtkfnbTB9IRW9Xg+WxlEo6qZO
ulptFDYcj3V/yi+sUGSlhJXDWFGyU6Ik2O3oiKeiBlI2GH3D1UP4t6sjDlTsGoLUbsTy8ucS
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MLKmAv91bYMEOoVVpl5XnUDR9RU6l3StYEd+aIiWJgSJ4cmzd1DR3NqNaXOGyAoetG68t/KN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==
=kFd3
-----END PGP PUBLIC KEY BLOCK-----
Another note: You're not supposed to sign a key unless you trust the owner of that key. And if you don't want to trust me, then you shouldn't be using me as your escrow agent.