{
  "manageEntity": {
    "action": "Save",
    "entityId": "1998956844",
    "entityType": "Track",
    "nonce": "0x67620068ebd40c721212b26001b38d01e70da8d9de8db3cee5e22aad19acbcd9",
    "signature": "0xa1b3adcc3a13525f7a2695245bccf964dd07ef08ac778c216cd2ee1c5a2618fc5a991073530e86a868e47476bc64a7c26f474013c57471b3640c136684a3422b1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}