{
  "manageEntity": {
    "action": "Save",
    "entityId": "1296962789",
    "entityType": "Track",
    "nonce": "0x39fa90f3ab489d168efeb494605956f5c9a7560069839a401e1a1195908c63be",
    "signature": "0xff028cb3f6232e68447bd0ad8d986b14fc9047ec79547e819864a936feeecfef050b254d0b85771a112cfe72bf432ceb3e883f8f6473f0d6846d52bca6525a6f1c",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}