{
  "manageEntity": {
    "action": "Save",
    "entityId": "303233680",
    "entityType": "Track",
    "nonce": "0xd0bdeee9dca09c026eeee4fcc9002035bf618572ba87f1dfb273a444eb97e4b8",
    "signature": "0x74077e3625d22375e56f0c7a88d5bd8a0f30e8d7c4eadcd7f90e76f20812360943aa595d90c59c012d66ff4aecc9d23e0d427e5cb4bc9cbe20433a4fd29eadeb1b",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}