{
  "manageEntity": {
    "action": "Save",
    "entityId": "777530919",
    "entityType": "Track",
    "nonce": "0xf93c175bb453a90595d826e5f6796cbcd69c2ab80425a68a1eaf9735c510688d",
    "signature": "0xe1e2f1403fbcf70c3646ae8796bf2cfd959401cbc2fcc54c050cfa3d7fdf848b45a5a8330cada41fc868c71fcabfc8619d27ac55ec5877f1eef9fd05e09f55d51b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}