{
  "manageEntity": {
    "action": "Save",
    "entityId": "726079358",
    "entityType": "Track",
    "nonce": "0x45409eb33d4e0eccd8b3e8869d4bcf5979da2c72de36260aec1118926a515bd3",
    "signature": "0x82c60caf2b8007f8c9041d12ef14c4b107f32d218d9e741a8dcaa7d32433ef0d6941598cffcd086b22d4dd34b2327396c4534ae58f3f8e5254dbc0b1f7c07f7a1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}