{
  "manageEntity": {
    "action": "Save",
    "entityId": "1803755634",
    "entityType": "Track",
    "nonce": "0xe54e252e8ab144ba1626d79bf2abee40e544383bd8d85432bc7f02a3e3124401",
    "signature": "0xeb267e9c429598c5d0048c7f2159dac5b29db1880cfd25367c1558fe748431994c28b14a47489ceb8284194b503168ecf3b1866aa0f575ef7c1e40c15f8412f81c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}