{
  "manageEntity": {
    "action": "Save",
    "entityId": "1590964831",
    "entityType": "Track",
    "nonce": "0x3b2a2dc9abef77638b1271be857eb9986ed3b26ca4db18e7d33610942636c5ea",
    "signature": "0x4e23fae29a23cfcf8085dcf182d8913c7b7a4e92f180b7a150b3c5bb5fd0b39b5b5628e6627ef88aa13126cbd0513e5d3c9463c7fe2cff1b6e6ac6fec0bc81e31b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}