{
  "manageEntity": {
    "action": "Save",
    "entityId": "544318",
    "entityType": "Track",
    "nonce": "0x6881fddc22cedb99bd049b641a64090f710afdd0454e99223da3eb415bb7042a",
    "signature": "0x2726c1368e55d3adbfc2af956d762f713567c99b5c8396c93c0ae914421e195340a6b8f35ee8cd66b6df76bf7f5988017f7d75081e6ba07baa8753ad77d391b91c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}