{
  "manageEntity": {
    "action": "Save",
    "entityId": "373515244",
    "entityType": "Track",
    "nonce": "0x3a6f576b37b2a27da526c4d33e3900b3d3f113e17db892c1528ceabff8df4d73",
    "signature": "0xcadfe8d505f406a99e7e5aea026e14995c521b42492262618a94382d9a71dfb452747de14baddca86ae44f3268ae634415e9c1a9c7b8b5b619fd0b458f435ff41b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}