{
  "manageEntity": {
    "action": "Save",
    "entityId": "1377841541",
    "entityType": "Track",
    "nonce": "0x335e187a3f994cb3ebb9d5b0b79da3088fc634e2c804cd76822e0dbce6c85940",
    "signature": "0xb933be11c7a8a4152f48417ae71cb530f33b7ca94a04eb41f5df183f8e2f03cb179a8028d09629182268ba56e9540ba86e51799e5be4bdb990f51d78efffa8691c",
    "signer": "0xAaC77705f5f6bd787D8581c36Ddaf7c0c7AE3370",
    "userId": "827420993"
  }
}