{
  "manageEntity": {
    "action": "Save",
    "entityId": "1575307738",
    "entityType": "Track",
    "nonce": "0x0cba4ad0ceebe5373257eda761d7827599610c58def683adebfc3bf36fddb231",
    "signature": "0x3d60e0d55744a10ae377026a82c3c6c7b88f134a4536d8ec9c875b65d7fc32093a984b0c42e57d835f1b6ebca9943cdac16c9de7519d0823ac9ad16be4f1bbac1b",
    "signer": "0x69B039fFC20468b984e20e6D453fF1c01B206f1b",
    "userId": "896352050"
  }
}