{
  "manageEntity": {
    "action": "Save",
    "entityId": "245429",
    "entityType": "Track",
    "nonce": "0x3431b01269a83359c708e67aee902dd3ccdfd7a626232b26b88df1460a41cdf9",
    "signature": "0xf66373f9eba684a5eaff8adf4b9cfcb968f20d8d4ba543356e131208b885a3557f3c727a3607bab20ae6b0cc7b7cb55f5b6f0044dbf43b775deed17f258074f51c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}