{
  "manageEntity": {
    "action": "Save",
    "entityId": "456758",
    "entityType": "Track",
    "nonce": "0x3b64c6500390eb51ff1db29f118a6c21e4d551c63845d101f53af91a408de740",
    "signature": "0xaa820fc2820c899b8eb9f36fdcbb755b1290fd613ecb110d3620679834f8e652250c38690535172e77b0048c3b1c80036f211f351d79a1e1023655d238402bf21b",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}