{
  "manageEntity": {
    "action": "Save",
    "entityId": "613724783",
    "entityType": "Track",
    "nonce": "0xd61ec58b50776b7751a0f709c1a0231e2252c44e705beedc7553db0460be9af6",
    "signature": "0x752be9f12dc9c270457675e3385c88c983598b7cb9d1579ea6d79b3d973742d100c2e242a95a41ca7854cc47086bf992c0ab3bda6d76d6385e97a1500b8dbecb1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}