{
  "manageEntity": {
    "action": "Save",
    "entityId": "558249234",
    "entityType": "Track",
    "nonce": "0x9856540b5cf948328e24d7babb7cfb946d98b4950ea542a927f9424c5c78cf8d",
    "signature": "0x39d196bb191ac85c90756e089ab4e8d6fa7cac5303e1a3b8787456f8937d777e31de9893e2c7e62bccbbb6ec527ac60e97b55c65f45e6aaf6b06fcf2f880d4fc1c",
    "signer": "0x102a924C1c076Dcb5816d20E32Dcb6F00e75F2C9",
    "userId": "485987672"
  }
}