{
  "manageEntity": {
    "action": "Save",
    "entityId": "447947281",
    "entityType": "Track",
    "nonce": "0x73d18f56cf004b4e24124022075926615b56b088d233dd3c20322ec0c6f7b023",
    "signature": "0x456b1078f1f97a8e672698bc83cc5608a77e95803a83398a1a3c1f964fe43cb275d7912575b3557e0d26d2f6b946c5a2b260cc15dcfa82f28ac1909c43f673981c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}