{
  "manageEntity": {
    "action": "Save",
    "entityId": "1451412929",
    "entityType": "Track",
    "nonce": "0x9fb31de10d95df230fbbd9e25fb30e5d35411a39bed8f12174a1a3ff850e5031",
    "signature": "0xb03a73c2403f3e2a1a85e658238d67fda07e7420478869940cafad5d21f55c88396d7c1b0dbfa3b9f8412265776d4ad06dfffb8a6adbd974679cdfdf482071fd1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}