{
  "manageEntity": {
    "action": "Save",
    "entityId": "1374450048",
    "entityType": "Track",
    "nonce": "0x1f4e04948cd6d84e59732fcfc6bc4a035684e2a9cf1f6e682bcec6e99fae69c7",
    "signature": "0x76e44626ffc52e2769ceac0db332a293222f25cf140014b483865a8f14438017706f5598f7eb61f20f76362d42ecc06d5b97e603850167ba431128498a3e312a1b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}