{
  "manageEntity": {
    "action": "Save",
    "entityId": "1199639636",
    "entityType": "Track",
    "nonce": "0x5fb62151b1fcbf54e164ef92919e751f263e07e2704fe240df2a8d27c98a04f8",
    "signature": "0xa0b3979f214d827d2f0476308328b0ff3318b2bbc99dba0e502c8755093948e50b6b436beab3a1c9353646676e335d392fc00498a75a40810819fa62ca4e79371b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}