{
"ok": true,
"service": "core",
"operation": "getAccount",
"data": {},
"meta": {
"requestId": "req_123",
"durationMs": 12
}
}{
"ok": false,
"service": "wallet",
"operation": "sign",
"error": {
"code": "SIGNER_NOT_FOUND",
"message": "Signer does not exist"
}
}