{
  "manageEntity": {
    "action": "Save",
    "entityId": "1978911843",
    "entityType": "Track",
    "nonce": "0xd5d724777509fdb9b936f43c05e003a74bec9893f7b8eb63c25bbb80a97f8dec",
    "signature": "0xf76154ef32eb83192522a5b3f136247f403363a6f28ce39e3a5ed0056449de641e686480fae51c5f150755a396f903d93ceb645c6b7c513b07a9047fec3c8f861c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}