{
  "manageEntity": {
    "action": "Save",
    "entityId": "1642125899",
    "entityType": "Track",
    "nonce": "0x0dbb57cc1317d36ac1d984f8be4eebf7f107a492ca1cad51decfc7a420305785",
    "signature": "0xeae80d68fe40f687172a33ba5d76d0716cca931c5094d3d29f176d1a0c952bf622aa193ef467b922650b8bf0c900aa9b71e57e622f3b91851b1c15aa537ee0841c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}