{
  "manageEntity": {
    "action": "Save",
    "entityId": "544329997",
    "entityType": "Track",
    "nonce": "0xd48bd96df42f4ad5a34739a252177b168ce8038adeedb2b7a863a48196c43b0c",
    "signature": "0x227f94ca27c31ab96fb3218db14637c728bfeec4d16a3b7e82c56490cf75cbe03b1d2ed7be581b058d7143a9b0524b9ad3b85930afe9d94102cd830493cfa8681c",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}