{
  "manageEntity": {
    "action": "Save",
    "entityId": "1303198483",
    "entityType": "Track",
    "nonce": "1793546466269092927",
    "signature": "0x4406598f28507aa87fd07cbe4e95826428a37011a41228becd629e920eafc5a226077ed8fce050e2b8f27ef0909995e651dd0ae8d9647df5a1a0f4cee54ad5a61c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}