{
  "manageEntity": {
    "action": "Save",
    "entityId": "256415",
    "entityType": "Track",
    "nonce": "0xc0c85b064893a2294952a03d9494ef7f29b7e7f811b43b28c9c28a14d81708c0",
    "signature": "0xa4657bab1375872a6fb96341ce5b897d89ab50b15133c0474fdb044775d86bda548ee16ef0889a8785892d0ca2b988b02f51a2347dfc2f95c6165c9c17b9da661b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}