{
  "manageEntity": {
    "action": "Save",
    "entityId": "534649",
    "entityType": "Track",
    "nonce": "0x43798cc54abf7c5b66aa07eabcc9c7c2c465fb9c56cf22f000c510f12ec39ce5",
    "signature": "0xacf194a85968933773550552d98934bcbe3bc37bb186fd58fad2cc1aee2674682c206968d346431fe7354d2680e6f84cb8402b755d3b6bdf6a16dcb868e473351b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}