{
  "manageEntity": {
    "action": "Save",
    "entityId": "1689131571",
    "entityType": "Track",
    "nonce": "0xd2cedd30a99b89ccf50d1211979db88efa4b22960c61e6bd1f74dac1bc7722e8",
    "signature": "0x7874a0d52d9f9c1aaf1d56aba74b9661dce502caf5a3ac22bfb96c26d9e3cc1542eb485c00f63c0fa30d17ff190b575164dd439798f272a5a3cdcd419ad63a531c",
    "signer": "0x16D3bf5a80bAfFB2f1550d49b1203D4CA532DA1C",
    "userId": "1994482"
  }
}