{
  "manageEntity": {
    "action": "Save",
    "entityId": "1855370430",
    "entityType": "Track",
    "nonce": "0xaf3faaa411dfaca5792b7af72dbb44b2c4ad99212d271eefc5fd4a6c25ba0261",
    "signature": "0x1aaa60558899415ba20a21272d8044bc541c007b3765b350b8113fad967b1691512647be3c2738b3bd462ac041c5f7a3e9dab2cbfb7572eb4d8c82eb6d8342821b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}