{
  "manageEntity": {
    "action": "Save",
    "entityId": "509850606",
    "entityType": "Track",
    "nonce": "0x0ecb4a2b1f1a6982d9916afe496cf6898308567f0c94444041ae8bd270539899",
    "signature": "0x5abfc506278276a44ed5dda7bed5e049b058bc3d8d0acee1bcfbfa10ca79a5bc22bec365fe23d48cfd9796a831a04adec749459fc35c006ebcece574f363f68f1c",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}