{
  "manageEntity": {
    "action": "Save",
    "entityId": "378889882",
    "entityType": "Track",
    "nonce": "0x7359efd5a4b441987c9c2ecd5c9d32097afb3df96393613adbf16c3713a79abb",
    "signature": "0x1d369579663b1454a2b3dfa746a27122f69d6d6e04852c207bc634a2c2e868f7456950271fa5602e5ea4e897dcef3568428012a703d105415ccb2332e03ce4c51c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}