{
  "manageEntity": {
    "action": "Save",
    "entityId": "569650343",
    "entityType": "Track",
    "nonce": "0xa8efee3b866861453e13e8888441eeb22db23e7c12e26c8ab5ff650e0c8fb43a",
    "signature": "0x99e054c52868017415e202b6b848250ce3dcbf52f4142883e7735d93a5ba700a196b4a28864f54671e12820cb5566a27d3daa5182b39ee3758275fa771351fca1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}