无法通过Web Crypto API验证ECDSA SHA-256签名求助

我尝试通过Web Crypto API验证ECDSA SHA-256签名，但始终无法通过验证；然而使用OpenSSL命令却能正常完成签名验证。

我的验证代码如下：

export async function verifySignature(
    requestData: string,
    receivedSignature: string,
    publicKey: string
): Promise<boolean> {
    try {
        const textEncoder = new TextEncoder();

        const digest = await crypto.subtle.digest('SHA-256', textEncoder.encode(requestData));
        // using digest

        // Import the public key
        if (importedKey == null) {
            importedKey = await crypto.subtle.importKey(
                'spki',
                stringToArrayBuffer(atob(publicKey)),
                { name: 'ECDSA', namedCurve: 'P-256' },
                true,
                ['verify']
            );
        }

        // Verify the signature
        const isValid = await crypto.subtle.verify(
            { name: 'ECDSA', hash: 'SHA-256' },
            importedKey,
            stringToArrayBuffer(atob(receivedSignature)),
            digest
        );
        
        return isValid;
    } catch (error) {
        console.error('Error verifying signature:', error);
        return false;
    }
}

可正常验证的OpenSSL命令：
openssl dgst -sha256 -verify public.pem -signature signature.der data.txt

内容的提问来源于stack exchange，提问作者Suman Maharjan