{
  "manageEntity": {
    "action": "Save",
    "entityId": "1254829149",
    "entityType": "Track",
    "nonce": "0xa165a86d61d128253e314bfea957a9ec670a449c2eb654652de1cc4c00f4031c",
    "signature": "0x1731d9b63c435b21b1b61d23292c658d0127cb41cf83f74441302eae6dead1ff58d519ace4a0cbce9c779f4e059d2cffb726293d4909270d812aebff7e1c01051c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}