Challenge verification

curl --request POST \
  --url https://api.openformat.tech/key/verify \
  --header 'Content-Type: application/json' \
  --data '{
  "signature": "0x860729b.....",
  "public_address": "0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266"
}'

{
  "api_key": "5a2a5e28-1851-4029-b0db-987e4b235a35"
}