{
  "manageEntity": {
    "action": "Save",
    "entityId": "218703397",
    "entityType": "Track",
    "nonce": "0x073093c895a791bd2eb8e913fc4b087e69581b0c3720e44d99cd65aecb9e5ee2",
    "signature": "0x3c12a2cf8b51ebde441a720f761f8eb6bef9c1240f430ab4f7ec32c97d781aed0bad6159aad2f4d1ade475ea0deb38e7d4cd0f24df71d963d26b81d1cf4802ba1b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}