{
  "manageEntity": {
    "action": "Save",
    "entityId": "459859",
    "entityType": "Track",
    "nonce": "0xe528dfd7970980d3de7f373aebd3feb94d825c9960bf0974b7efa1e1d6867f5e",
    "signature": "0x8d00c4c14c7b34ce4578aaba05cd209652c7f8c30ed1a580ee577a80f13c7bac506b67a916a3b79c4b8c0b48dec4285085547bc712957c7b9ea5cfdec61406431b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}