{
  "manageEntity": {
    "action": "Save",
    "entityId": "1504402426",
    "entityType": "Track",
    "nonce": "1792468978767673908",
    "signature": "0x2d72551657252fc31260ff55123672759e21fe7bfe3ceb6e58868e0cc1bf6ec753b9b115e601ff935673470480635ed86ca2bc58d938ceab8ee5668e62a69bd91b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}