Unfortunately, I cannot determine if the "pubkey" in this JSON object was used to sign the "id" property to produce the "sig" as the information you have provided is insufficient.

To verify if the "pubkey" signed the "id", you would typically need access to the corresponding private key of the "pubkey" to generate the signature and compare it with the "sig" property in the given JSON object. However, even if you had access to the corresponding private key, it is important to ensure that the signature was generated using a trusted signing algorithm and has not been tampered with.

There may be additional information or context needed to determine if the "pubkey" signed the "id," such as the purpose of the JSON object and the ecosystem in which it resides.