{
  "manageEntity": {
    "action": "Save",
    "entityId": "623715712",
    "entityType": "Track",
    "nonce": "0xe26455126ad55fccd0df37ce5821567972aa0d3297ebb3b221701ce534164c6e",
    "signature": "0x6722fefd4797e65b25eb7a2911d5e9944d62335353c82c61fbb06fe1623098c93943758a2c0a97e10c6a110210ff2e89489cb36601cf3e7ad2cb87ef9188b9a71b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}