{
  "manageEntity": {
    "action": "Save",
    "entityId": "526613784",
    "entityType": "Track",
    "nonce": "0x6c1809f85a406d6d260ab1fa550adc321b98c5b496aad64c1f5a8ece64c52240",
    "signature": "0xd13f64a2343cf6fe7db0e66884078776e38b8db66164c4bb350a4be230fb4558586c3e4ce2001ed63ffc99f0c84611d12cfb5e226749bff7da82b508b3853f441c",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}