{
  "manageEntity": {
    "action": "Save",
    "entityId": "621723",
    "entityType": "Track",
    "nonce": "0x811c9521a4681153db7214cea217c70dd7a48a92ddc8d1e4ff58d5066642ef7f",
    "signature": "0x99b81866181b4a54a960c7c3bfe4d5b051c9508bc4f03a3ef5d8af1d31435c3e274a0d2a7128b9992b7ed22024488f81059daecc5b40dfe360b583205783ace41c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}