{
  "manageEntity": {
    "action": "Save",
    "entityId": "810488669",
    "entityType": "Track",
    "nonce": "0x444957dabf24e3826808188ef9c11dfd7c7af85400129f1885866c1fa0c35c67",
    "signature": "0x1e7d103c3613f7447de7194f8e4302b801de4d2a4a754a5642b01fdee83828803152269cb821ba168403eb7ffc07ca89262aab48fd27020663c64a308e533c201b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}