{
  "manageEntity": {
    "action": "Save",
    "entityId": "1954587783",
    "entityType": "Track",
    "nonce": "0x2a14ed3c0a4aa018b0a0151ce9d36d925c7d0277b96a8615e0b42ee3f764d3f9",
    "signature": "0xe575f783c29e24e37dddfafd8269bebc2a3577f9b65003dad4d513a6ecf6b4445d0a2fa64ef4521c37c5d469e10a6e0b121448f499f7e9455cb8bf7ca94541c01c",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}