{
  "manageEntity": {
    "action": "Save",
    "entityId": "399478617",
    "entityType": "Track",
    "nonce": "0x5e6a4e6defe561230a26656e55e57f007b831828b58082773e2db0187f0437b1",
    "signature": "0xa8e976f3d07c11be4a40f8203a0a5f24d84dab521bf24a2caecff5198ce1ab721a1e40fa0c82c5451f7b164ddfa6b28f91d611d17ad755a86199abe226632da81b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}