{
  "manageEntity": {
    "action": "Save",
    "entityId": "320997315",
    "entityType": "Track",
    "nonce": "0x547e860f48cc14cd47f79da17366bf34fba1f2a738ff46f157345ab2dbf9bb63",
    "signature": "0xa46f2bc69088884a27194b0d2dc6f7f0ff5d563222540325734d5b650dfa1b305c904120d3f9c7b87f8c08bdaae058b691f09eb2787506e9c901e5c205740e981b",
    "signer": "0xF08935327AeC6306C8d0eb92999567e5496848C9",
    "userId": "989073793"
  }
}