{
  "manageEntity": {
    "action": "Save",
    "entityId": "489042919",
    "entityType": "Track",
    "nonce": "0x06d270937a26b8e513121e5d2c2e607d1fda6fa61ef28a0eccb5c7383558a675",
    "signature": "0x0c1ca8555af2615784cdfd371acc390c13e4c58aeab30b5b0b1e36d08380be6401810491805bd1d245b4f43107d53689f4360410af2284c764f9b49fd5a6397c1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}