{
  "manageEntity": {
    "action": "Save",
    "entityId": "590382921",
    "entityType": "Track",
    "nonce": "0x735328783a0861064dc4e23417934e2e75dae4d51af93909b5aa63df5e839896",
    "signature": "0xe836d46b8bbfdc908461088f42de6bded878a77ece6747525dee12d203a769a263bcd90e2e2f0851991e591d43dfcfc5d31e3871e7bd686497cd0c9a0a80a93b1c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}