{
  "manageEntity": {
    "action": "Save",
    "entityId": "1490514888",
    "entityType": "Track",
    "nonce": "0xde573b7b1cf0c0ef5039344312472d1f98ac2d0478f9640fc6ccdfccfd18bb97",
    "signature": "0x8c74a8afbc3e71e757d6335fa0ff332b5f382a401c46bbc3b5d9280c1f01fa02798b2b313baab5f6fd98841da74855dfd3c97bb0695c2253e3ecca4611a485381b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}