OpenSea Listings order hash and signature return recovered deifferent address

[pamungkaski]

So I was trying to validate order components payload on my back end, and somehow when I try to recover the signer using OpenSea order hash and signature, it returned a wrong address. My first hypothesis was that there is something wrong with ecdsa lib on the backend. Hence I created a simple contract signature and hash verifier.

https://rinkeby.etherscan.io/address/0xc6c1c47713603f9d22ba3012d8bb49ddb2ade88e#code

I try to do the same thing there and it also returned different signer. Now I am confused on how to verify the hash and signature.

Listing Item: https://testnets-api.opensea.io/v2/orders/rinkeby/seaport/listings?asset_contract_address=0x80f8e9f3b37121a9d5e00ecf4f2f15c87da332ae&limit=1&token_ids=979

"order_hash": "0x125fd17c5c0ff73edc4861a037d2cbea75301474e9e6128947521c172a2aaee1"
"signature": "0x8dc577c350086baef9b1fbbbedb46aa873cc38efa2cf5a233962217af80744c9321ebcae95f905d4bf62b93883f912cf937fe2f9315a9a8380f641dc8e0ebb891c"

signer should be "offerer": "0x8924f3f982a1c6b59fbdcc8ece1cbdd46188fda2"

but some how it recovered 0xf4511BbE781158A6B2fb3D0Cc85A961e431762CB

Still have no clue what happened

[pamungkaski]

Okey I just found out that, the data on the endpoint was only the hash for the typed data, so without domain, so I need to re construct the typed domain, and concat them into one, still trying to concat them ill update later for the final summary

[pamungkaski]

So I can confirm that the orderHash returned by the endpoint is indeed the typeddata hash only, for the domainSepartor, I use the value from contract (information function), and it work like a charm now.

Tho I still cant construct the separator in my backend using the same value

EDIT:

Found it, my verifyContract data type was string instead of address