{
  "manageEntity": {
    "action": "Save",
    "entityId": "1975358915",
    "entityType": "Track",
    "nonce": "0x52ca884a2875bf85ebb15aff76418a6bdfbc99f17b982d7b08372fbd1d93e11b",
    "signature": "0xf4aafb7a71530958b4a34de5e562c2bea1acfe69f72644ec3a1d7fb834216ac93ea2982fba6058f4224ace54b88216871e99e55136dc1e09431a12b25d765e011c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}