{
  "manageEntity": {
    "action": "Save",
    "entityId": "1904802725",
    "entityType": "Track",
    "nonce": "0x2b65f15a747ae15d5ec1dcf0b6cf86f111ea5d31361e5f9904ec92b10858656e",
    "signature": "0x4ac87bf1d5be227f742b2411b8440f55796627abea9f5575a385776c94f945f562a22349d3eec8f84378768bc8bfd125315592cd42f6979b9bc0dd9951c8a2fc1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}