I am trying to retrieve offers detail using seaport API for a given asset contract for a given token ID but it returns null for the signature field. My understanding is that this signature is the signature from the offerer. and if I wanna accept the offer by calling the seaport fulfillBasicOrder_efficient_6GL6yc function or any other similar function to fulfill the order directly via etherscan I need to pass the signature.

My question is why is testnet API returning null for offer that is created and I can see on opeansea?

Also, what is the exact JSON format for an order that the offerer sign, I tried to create this signature locally for testnet by using mycrypto/sign-message

I tried using parameter JSON (returned by API call) and stringify it but couldn’t pass fulfillBasicOrder_efficient_6GL6yc function call transaction-simulator it fails at Seaport. _assertValidSignature


Additionally, I am open to any alternative solutions that achieve the same goal. Thanks

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  • I have the same issue. Any luck finding a solution?
    – ztnark
    Apr 18, 2023 at 14:22
  • I ended up writing a script to generate signatures locally. Since it is testnet order for which I wanted a signature to fulfill, that belongs to me. so, it is possible to generate signatures locally for testing. I am using opensea-js. Apr 19, 2023 at 15:29


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