{
  "manageEntity": {
    "action": "Save",
    "entityId": "741986848",
    "entityType": "Track",
    "nonce": "0xd74c2085d1f1a1ca6ec2b14246513b2838f031e2492ace229a751ac910d98fa5",
    "signature": "0x7d7178995e0650a5d4935cff9ba42349b58c2e82f85be673d15a9629a901e8ce2922b8a9246abd5d0c1dadc8430db0f3dc6bd9c1a032916a36298f1ed5c097281c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}