{
  "manageEntity": {
    "action": "Save",
    "entityId": "943285373",
    "entityType": "Track",
    "nonce": "0x800a72c47054c77d18e89b1807ad8da3d9f907dfa107fdb604c3d2a86c695253",
    "signature": "0xced90ab7f95efbc26fbceaba7b1aaa8476ac270550e2ca2db88591a5b5e8f3c21ea766089cb8bfd1b0ba624880d39dcbd3bd0a993fffae0d114f0cf491fe27261c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}