{
  "manageEntity": {
    "action": "Save",
    "entityId": "758873",
    "entityType": "Track",
    "nonce": "0xcbc6b73b2b4e725eb73aa6cbd9208ec3e5bdaeacfde65a49c72011d3e7c29780",
    "signature": "0x81a466e13c2b40cb8ac11e42c37fc6ccb7cb29273f322f1d0a5126d9141804b00e925e78a808b505662c1f56b5877587a48feae3799b08603f2621899412b9451c",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}