{
  "manageEntity": {
    "action": "Save",
    "entityId": "185275",
    "entityType": "Track",
    "nonce": "0x649f7001557126039b3137557e5a0ecf5f2f0232e43058233e57f50aec149c2a",
    "signature": "0x2b2d1c3e46727499807fd029be819351df6a01c37130b52dc5c8dd972db981fc4d160ff7f7e447d5955736a0e82352903a2fc0865c6e279060b51a098eb9c7671b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}