{
  "manageEntity": {
    "action": "Save",
    "entityId": "1590368519",
    "entityType": "Track",
    "nonce": "0x78334a93720d845d2e1a7832c425f1bc6c5a45e5589a14355081cca64635e318",
    "signature": "0xcd1b209d509ade07767dfd800832c868bd59bfe190c73193426260e8a883357443a243e53b52da62bc1fbafe4fee722ec04f7f42c0ba16da25a84bd4a49b36841c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}