{
  "manageEntity": {
    "action": "Save",
    "entityId": "274018",
    "entityType": "Track",
    "nonce": "0x6a575e14015f497d76a6d22ed716da7959fc188234932c91e75630494f5e8fc5",
    "signature": "0xeaffda1d334108276a4a4353efff2f4d185a515259b155c79241e3e89a041a0a317739c9ae5a563d5b8a3081ab704eb3d0e002cbfb37577fc2004706e3a0c84a1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}