{
  "manageEntity": {
    "action": "Save",
    "entityId": "814308",
    "entityType": "Track",
    "nonce": "0xe62894db2a9457ad663a00f130e728498429cd498b66a1e2212e84c863421b02",
    "signature": "0xd2e8d2a3dec05af3f8a185f7aa12a465bd542b0435b20ea4337ccd3eb2b5530724b6de14fa6a67143b4db00cf75963633f146abc5b810ec057dd7626ee1c397f1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}