{
  "manageEntity": {
    "action": "Save",
    "entityId": "421155",
    "entityType": "Track",
    "nonce": "0x4f63ff8f5ac713e409711f89c648e21fd8c8533b9c3d7c745176f182c81ae1e1",
    "signature": "0x8936554aadab65c491f6f8637dfe7fa61f7adae7a84868d51fd3da1bc63ea704569d526af7b927f12da57d3a24aef7e48b7adf8a41a46a6a5a22b29599aceed71b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}