{
  "manageEntity": {
    "action": "Save",
    "entityId": "1915294129",
    "entityType": "Track",
    "nonce": "0x916d0bef6a07c4e1340469b25c65c493387ee09563d545930974efb0a5331b54",
    "signature": "0x2efed6b4f9f5a4be9fcb509633d9588c4d7e6e8dc39f80fe2284c244807d00835cba3a89a040e37863e1e37c73ea0332315a50ab1c5522273d67bd966739ae381b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}