{
  "manageEntity": {
    "action": "Save",
    "entityId": "748847722",
    "entityType": "Track",
    "nonce": "0xf044a0185f77fdf2e55f0f6025dcdef2199bdf3cf319f6b9d6daf641b0ab6744",
    "signature": "0xf2d4012705eaae831c8e931b3effde6e9724b80ef94748a1a6542b2becd3c465684adce68fbdd34a21bf107c32b720f1ea0df47b0e3cb3aaeb9741e81772ca311b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}