{
  "manageEntity": {
    "action": "Save",
    "entityId": "2007219985",
    "entityType": "Track",
    "nonce": "0x56961154365e2e913327e62f0c3857801884a0308dcce129b60e0498f5484397",
    "signature": "0xbe7c9dbbe0e83f8740c454bde9551f689d3bdcfacc409a7e409ad3069a9937f05a7a33c5b4de18bc84a0f382b9cb5ed136155f7ef5663d02d957657618edb2dc1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}