{
  "manageEntity": {
    "action": "Save",
    "entityId": "474881839",
    "entityType": "Track",
    "nonce": "0xd8f876e5b5f41438c46500b7690f19d9a2320839ec1ca1ed7a8aa0f8115fb2b8",
    "signature": "0x923788498b0ed19c8afb917e8ebc182cd603d01c174924eb05afe5a36dc2bb0b453624dd0205e00c462dc51d6c0db78456ff3e8a337aa87fcc2640e14178a4201b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}