{
  "manageEntity": {
    "action": "Save",
    "entityId": "1290457770",
    "entityType": "Track",
    "nonce": "0x3c5bec2e2062b83cee950543b570362be9dde14c8a43d15d77c5be96fa059890",
    "signature": "0xb1d6574689ed85d951c5b282a7828c7a1052625a0e0a5a36c87b1dbce8ae03f05341ea225716824da8c03d0037125c252c12f228daa6d90bd22c25facd4af00c1c",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}