curl -X POST https://api.axonvault.io/v1/signature/verify \
-H "X-Access-Key: ak_live_abc123" \
-H "X-Signature: 5d41402abc4b2a76b9719d911017c592" \
-H "X-Timestamp: 2024-01-15T10:30:00Z" \
-H "Content-Type: application/json" \
-d '{
"hash": "0xabc123def456789...",
"signature": "0x1234567890abcdef...",
"publicKey": "0x04abc123...",
"algorithm": "secp256k1"
}'