{
  "manageEntity": {
    "action": "Save",
    "entityId": "619505658",
    "entityType": "Track",
    "nonce": "0xd35970ad7ddf42f28b82f8a75032ce4b90410a5a0008799278189b28f8efdc11",
    "signature": "0xa771728fc16e001c5300626385dbc1decb7c0d668067f87346d1e16b0342bb7033f3dfab5621aeffaeafd9d70e8897f1ef0d7c5578d57350e35841a9d9a5e73a1c",
    "signer": "0xb51B50C9b7d88C66d31539161F4BA9Dd72a17dF5",
    "userId": "465531556"
  }
}