{
  "manageEntity": {
    "action": "Save",
    "entityId": "1649138002",
    "entityType": "Track",
    "nonce": "0x151a8bce41eaa0626adbad2efa3f77989485e28c122f55c6b44a26176ae63390",
    "signature": "0xf77dfe85229a812abdc0a63580bb90a1f8101800ea34dffa0fe0a881790d76057a4d2f60586e83dd5ae3ddfa0799ec84c1e5479aca564ca93e0426e2fd8d330c1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}