{
  "manageEntity": {
    "action": "Save",
    "entityId": "818098440",
    "entityType": "Track",
    "nonce": "0x8ddbcdca5c6bb7c062e0f74cd252caafae98e2a38a5e6482a48cc62938be4bd4",
    "signature": "0xc7177d9aca69d631ff78930f130d852b72a0a1b6b33da96a74011803b9aa201e2b08543b87c5b01ab995d1aa7445daef48c0bc5fe5b1753b38ee969a9dacb5cd1b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}