{
  "manageEntity": {
    "action": "Save",
    "entityId": "1963400828",
    "entityType": "Track",
    "nonce": "0xc2b479565a679ee97e1a3fc28829e1697bd64c02e0b19ac2e56901b7626c187d",
    "signature": "0x5384e8dbc47843cbb7329c2facea588131540410cdc07d40813f878b8ed814b43c752a00714bbd633c4b506ff2594d2258700bb44936bcc84f089c49395923741c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}