{
  "manageEntity": {
    "action": "Save",
    "entityId": "290903654",
    "entityType": "Track",
    "nonce": "0x86cd79e22a2da1ca42ff2f84db98b8f42487a837ebfe86ed54c4a1eceb033228",
    "signature": "0x1eb38dddf6660dfd6885e896640185480c7d800187eb06b47f400d7d2e7e3dae484a827e65241191cc3cfb2a0474fdf337625e74fecdfd62b8e784ab493bf8ee1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}