{
  "manageEntity": {
    "action": "Save",
    "entityId": "1403259364",
    "entityType": "Track",
    "nonce": "0xdcc0b08e914eb071af285c5089f0739f46b05189759759e49cbd98e1d20015d5",
    "signature": "0xfc173b300b04b0dc690daeb2bdae5096291b9530579f30ce12476a8fc0099e7e4585d04fe5933f80b639815707547e16715b1c0acea7e2b45650680267beee311c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}