{
  "manageEntity": {
    "action": "Save",
    "entityId": "421869992",
    "entityType": "Track",
    "nonce": "0x55361de7ee3b81cc1ba8e810a553bf468c48295e5d2e21b4fd4a72c943d39351",
    "signature": "0x8fc7fae2837840eef2ac26be2b8c0fbaac1ef47c4d35871805c565c760ee5fe57d0ab2df28fd745a4b14f9cfe225c6c29241e0bce73750a83c91871af3e39aa51c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}