{
  "manageEntity": {
    "action": "Save",
    "entityId": "1977178972",
    "entityType": "Track",
    "nonce": "0xcca82b4b957028ffd9efb35557079d2e23b1155725aad842e9885d40bbbde019",
    "signature": "0xdd89a6bd5b9a561630ee2e6abd653ae99c9778ade163716dd250692d7bb10c6376380a71c9a2d2009a455827f27b7f4d9f8622017c42cf848af0c5df64fc17561c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}