{
  "manageEntity": {
    "action": "Save",
    "entityId": "921996519",
    "entityType": "Track",
    "nonce": "0x504054fb0342b3d863d95bd50b570632c65717cdacc0397d7ee09270463537b8",
    "signature": "0x7a2a3c612666ee3dfa94b2fd1c2af36a5e703f65c6b4feb187600a7bee50ef8b1b23f0a9cf0a6e5e690a71888282e16da019a2c1e9a659d4033b41c6bc54de901b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}