{
  "manageEntity": {
    "action": "Save",
    "entityId": "619432",
    "entityType": "Track",
    "nonce": "0xf8ab745276fa9e9ec3ea57d61385cd59f6279100d02591d0b78825eec1fb06a8",
    "signature": "0x4a8f94f91d0d84208254f42840bfaf22e92b69bfcdabd025fa59af7fd72fb05e67d876f5da0ad97527ed4f423b13fde3120956cd98b05306f03d6a1f6cc6732c1b",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}