{
  "manageEntity": {
    "action": "Save",
    "entityId": "538944675",
    "entityType": "Track",
    "nonce": "0x00c381d2b7f6e59e5fb0640f8cd7632821df62b695205b7d76d60776f443db6a",
    "signature": "0xe38239f36740f797d57434b7a779a28210706a9daed945e2a3cea16ebaeda4b16caebc6cac633097d49788ce473c06049192ec5ecca92a561ca409783f4629fe1b",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}