{
  "manageEntity": {
    "action": "Save",
    "entityId": "303018406",
    "entityType": "Track",
    "nonce": "0x15ab47f03b4e03729dac25c1590e7aae248ad1ac2721fc0e5701d01c448317b3",
    "signature": "0x26f6687ab980bb347648e9f06022a10865163d689c51db07e006609dd028ffa873922b74fa6ba3519e71d51b7b7f325659c4f4a14eef23b281d36268d58079431c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}