{
  "manageEntity": {
    "action": "Save",
    "entityId": "1785325209",
    "entityType": "Track",
    "nonce": "0x8434e242bf1c465170e699e4456efcad0b87570485fe94ecf4a9574323547a9c",
    "signature": "0xe0525f38ade8402e0bed3dd8424535ce5f34a563a02647a6419aa9d8f592314d61917be4840a8c994a988886e4614515e68033d826ea0b275a51d23d5302a6101c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}